please need help on this please​

Please Need Help On This Please

Answers

Answer 1

Answer:1.b

2.c

3.a

4.d

5.c

6.b

7.d

8.d

9.c

10.a

Explanation:


Related Questions

Imagine you are on a roller coaster. Imagine that you are riding a skateboard or running across a ball field. What are some clues that you are moving?

Answers

✯Hello✯

↪  You can see the setting changing around you

↪  You can feel a higher pressure/wind on your face

↪  There is adrenaline going through you

↪  (if this isnt the context you are looking for just comment)

❤Gianna❤

The small intestine couldn't work without the _________ because fats couldn't be broken down

Answers

Answer: Large intestine.

Question 1 (Matching Worth 3 points)
(07.07 MC)

Match the action to the effect on the equilibrium position for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g).

Match Term Definition
Removing ammonia A) No effect
Removing hydrogen gas B) Shift to the left
Adding a catalyst C) Shift to the right
Question 2(Multiple Choice Worth 3 points)
(07.07 MC)

Nitrogen dioxide gas is dark brown in color and remains in equilibrium with dinitrogen tetroxide gas, which is colorless.

2NO2(g) ⇌ N2O4(g)

When the light brown color equilibrium mixture was moved from room temperature to a lower temperature, the mixture turned lighter brown in color. Which of the following conclusions about this equilibrium mixture is true?

This reaction is endothermic because the system shifted to the left on cooling.
This reaction is endothermic because the system shifted to the right on cooling.
This reaction is exothermic because the system shifted to the left on cooling.
This reaction is exothermic because the system shifted to the right on cooling.
Question 3(Multiple Choice Worth 3 points)
(07.07 LC)

According to Le Châtelier's principle, how will a decrease in concentration of a reactant affect the equilibrium system?

Shift it toward the products
Shift it toward the reactants
Shift it toward the side with higher total mole concentration
Shift it toward the side with lower total mole concentration
Question 4(Multiple Choice Worth 3 points)
(07.07 MC)

What change would shift the equilibrium system to the left?

A(g) + B(s) + Energy ⇌ 3C(g)

Adding more of gas C to the system
Heating the system
Increasing the volume
Removing some of gas C from the system
Question 5(Multiple Choice Worth 3 points)
(07.07 MC)

A chemical equilibrium between gaseous reactants and products is shown.

N2(g) + 3H2(g) ⇌ 2NH3(g)

How will the reaction be affected if the pressure on the system is decreased?

It will shift toward the reactant side because the reactant side has one more mole of gas than the product side.
It will shift toward the product side as there are more oxygen atoms in the gas on the product side.
It will shift toward the reactant side as there is lower pressure on the reactant side.
It will shift toward the product side as there is higher pressure on the product side.
Question 6 (True/False Worth 2 points)
(07.07 LC)

According to Le Châtelier's principle, an increase in temperature will shift the equilibrium position toward the products in an endothermic reaction.

True
False
Question 7(Multiple Choice Worth 3 points)
(07.07 MC)

What stress would shift the equilibrium position of the following system to the right?

N2O3(g) ⇌ NO(g) + NO2(g); ΔH is negative


Decreasing the concentration of N2O3
Heating the system
Adding a catalyst
Increasing the concentration of NO

Answers

Answer:

Question 1: 1) Increasing the pressure          C) Shift to the right

                   2) Removing hydrogen gas        A) Shift to the left  

                   3) Adding a catalyst                     B) No effect

Question 2: This reaction is exothermic because the system shifted to the right on cooling.

Question 3: Shift it toward the reactants.

Question 4: Adding more of gas C to the system.

Question 5: It will shift toward the reactant side because the reactant side has one more mole of gas than the product side.

Question 6: True.

Question 7: there is no suitable choice is provided.

We can shift the equilibrium toward the right via:

Increasing N2O3 concentration,

decreasing NO and/or NO2 concentration,

decreasing the pressure,

lowering the T (cooling the system).

Explanation:

Question 1: Match the action to the effect on the equilibrium position for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g).

Match Term Definition

Removing ammonia A) No effect

Removing hydrogen gas B) Shift to the left

Adding a catalyst C) Shift to the right

Le Châtelier's principle states that when there is an dynamic equilibrium, and this equilibrium is disturbed by an external factor, the equilibrium will be shifted in the direction that can cancel the effect of the external factor to reattain the equilibrium.

1) Increasing the pressure:

When there is an increase in pressure, the equilibrium will shift towards the side with fewer moles of gas of the reaction. And when there is a decrease in pressure, the equilibrium will shift towards the side with more moles of gas of the reaction.The reactants side (left) has 4.0 moles of gases and the products side (right) has 2.0 moles of gases.So, increasing the pressure will shift the reaction to the side with lower moles of gas (right side).

so, the right match is: C) Shift to the right.

2) Removing hydrogen gas:

Removing hydrogen gas will decrease the concentration of the products side, so the reaction will be shifted to the lift side to suppress the decrease in the concentration of hydrogen gas by removing.

so, the right match is: A) Shift to the left.

3) Adding a catalyst:

Catalyst increases the rate of the reaction without affecting the equilibrium position.Catalyst increases the rate via lowering the activation energy of the reaction.This can occur via passing the reaction in alternative pathway (changing the mechanism).The activation energy is the difference in potential energies between the reactants and transition state (for the forward reaction) and it is the difference in potential energies between the products and transition state (for the reverse reaction).in the presence of a catalyst, the activation energy is lowered by lowering the energy of the transition state, which is the rate-determining step, catalysts reduce the required energy of activation to allow a reaction to proceed and, in the case of a reversible reaction, reach equilibrium more rapidly.with adding a catalyst, both the forward and reverse reaction rates will speed up equally, which allowing the system to reach equilibrium faster.

so, the right match is: B) No effect.

Question 2: Nitrogen dioxide gas is dark brown in color and remains in equilibrium with dinitrogen tetroxide gas, which is colorless.

2NO2(g) ⇌ N2O4(g)

When the light brown color equilibrium mixture was moved from room temperature to a lower temperature, the mixture turned lighter brown in color. Which of the following conclusions about this equilibrium mixture is true?

Moving from room temperature to a lower temperature, means that the T is decreased.The mixture turned lighter brown in color, means that the reaction is shifted towards the products side.Moving towards the product side, means that we decreased the concentration of the product side, which ,means that the heat is evolved from the reaction and the reaction is exothermic.

So, the right choice is: This reaction is exothermic because the system shifted to the right on cooling.

Question 3: According to Le Châtelier's principle, how will a decrease in concentration of a reactant affect the equilibrium system?

A decrease in the reactants concentration will disturb the equilibrium position of the system. To attain the equilibrium again, the system will be shifted to the lift (reactants side) to increases the concentration of the reactants and attain the equilibrium again.

So, the right choice is: Shift it toward the reactants.

Note: The answer of Q 4, 5, 6 & 7 and all answers are in the attached word file.

Final answer:

These questions are based on Le Châtelier's principle and relate to the effects of changes in concentration, temperature, and pressure on chemical equilibrums. The reaction will always try to offset the disturbance by shifting towards the side that will help restore equilibrium.

Explanation:

The answers are based on Le Châtelier's principle, which states that equilibrium in a system will adjust to offset any changes made.

On removing ammonia, the system will try to replace those lost, causing the reaction to shift to the right. On removing hydrogen gas, the system will also try to replace it causing a shift to the left.Adding a catalyst doesn't affect the position of the equilibrium because it speeds up the rates of the forward and reverse reactions equally.As the mixture turned a lighter brown when the temperature was decreased, the reaction shifted to the right favoring the formation of N2O4, a colourless gas. This is because exothermic reactions are favored by a decrease in temperature. Therefore, this reaction is exothermic and shifts to the right on cooling.A decrease in concentration of a reactant would shift the equilibrium toward the reactants to try and replace the lost quantity.Removing some of gas C from the system would shift the equilibrium to the left to try to replace the lost quantity.If pressure on the system is decreased, the system will shift towards the side with the greater number of moles of gas, in this case, the reactant side. This creates more mole of gas, offsetting the decrease in pressure.An increase in temperature will indeed shift the equilibrium towards products in an endothermic reaction, in a bid to use up the excess heat.For the last question, as the reaction is exothermic, heat is a product. Therefore, heating the system would shift the reaction to the left.

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A 10.0 ml solution of 0.300 m nh3 is titrated with a 0.100 m hcl solution. calculate the ph after the addition of 10.0 ml hcl.

Answers

Final answer:

To calculate the pH after the addition of 10.0 mL of HCl to a 10.0 mL solution of NH3, we need to understand the reaction that occurs between the two. NH3 is a weak base, while HCl is a strong acid. The reaction between NH3 and HCl results in the formation of NH4+ ions and Cl- ions, which will affect the pH of the solution.

Explanation:

To calculate the pH after the addition of 10.0 mL of HCl to a 10.0 mL solution of NH3, we need to understand the reaction that occurs between the two. NH3 is a weak base, while HCl is a strong acid. The reaction between NH3 and HCl is:

NH3 + HCl -> NH4+ + Cl-

This reaction results in the formation of NH4+ ions and Cl- ions. Since HCl is a strong acid, it will completely dissociate in water, while NH3 is a weak base, it will only partially ionize. Therefore, after the addition of HCl, the solution will contain NH4+ ions and Cl- ions, which will affect the pH of the solution.

To calculate the pH, we need to determine the concentration of NH4+ ions in the solution. Since the initial solution of NH3 is 0.300 M, the concentration of NH4+ ions will be equal to the concentration of NH3 that has been converted to NH4+. To find this, we can use the stoichiometry of the reaction:

1 mol NH3 = 1 mol NH4+ ions

Therefore, the concentration of NH4+

...

Final answer:

To calculate the pH after the addition of 10.0 mL of 0.100 M HCl to a 10.0 mL solution of 0.300 M NH3, we need to consider the reaction between NH3 and HCl. NH3 is a weak base and HCl is a strong acid. The balanced chemical equation for the reaction is NH3 + HCl → NH4Cl.

Explanation:

To calculate the pH after the addition of 10.0 mL of 0.100 M HCl to a 10.0 mL solution of 0.300 M NH3, we need to consider the reaction between NH3 and HCl. NH3 is a weak base and HCl is a strong acid.

The balanced chemical equation for the reaction is NH3 + HCl → NH4Cl. Here, NH3 reacts with HCl to form NH4Cl.

Since NH3 is a weak base, it will not completely dissociate in water. However, HCl is a strong acid and will dissociate completely. Therefore, the concentration of HCl will be equal to 0.100 M after the addition.

Using the equation, we can determine the number of moles of HCl added and the resulting concentration of HCl in the final solution. Then, the pH can be calculated using the formula pH = -log[H+], where [H+] is the concentration of H+ ions in the solution.

In which solution is AgCl most soluble?A. in a solution that is 0.20 M in CaCl2B. in a solution that is 0.20 M in AgNO3C. in a solution that is 0.20 M in KNO3

Answers

Answer: option C. in a solution that is 0.20 M in KNO₃.

Explanation:

This question deals with the common ion effect.

Any presence in a solution of a common ion with the solute will decrease its solubility and here you can find why.

AgCl (silver chloride) is highly insoluble in water.

Its solubility equation is given by this equilibrium equation:

  AgCl(s)  ⇄  Ag⁺(aq)  +  Cl⁻(aq)

The constant for this equilibrim is called constant of solubility product and is indicated as Ksp:

Ksp = [Ag⁺][Cl⁻]

Then, any increase of the product ions (on the right side of the equilibrium equation), will result, according to Le Chatelier's principle in a shift of the equilibrium toward the left side, this is in an increase of the AgCl(s), meaning that less AgCl will be soluble.

Let's see in which of the given solutions is AgCl most soluble

A. Solution 0.20 M in CaCl₂

CaCl₂ is a ionic compound which also ionizes in solution, given Ca²⁺ and Cl⁻ ions. So, you can see that it will increase the concentration of Cl⁻, which means that the equlibrium  AgCl(s) ⇄ Ag⁺(aq) + Cl⁻(aq), will be shifting to the left, decreasing the solubility of silver chloride.

B. Solution 0.20 M in AgNO₃

AgNO₃ is also a ionic salt which dissociates in water giving Ag⁺ and NO₃ ions. So, it will increase Ag⁺ ions, also shifting the equilibrium AgCl(s) ⇄ Ag⁺(aq) + Cl⁻(aq) to the left, decreasing the solubility of silver chloride.

C. Solution 0.20 M in KNO₃

Since KNO₃ has no common ions with AgCl, it will not affect the equilibrium equation in the same manner and you can expect that AgCl is most soluble in KNO₃.

Final answer:

AgCl is most soluble in the 0.20 M KNO3 solution because it does not provide common ions to AgCl, thus avoiding the reduction of AgCl's solubility due to the common ion effect.

Explanation:

The solubility of AgCl (silver chloride) in various solutions can be affected by the common ion effect. However, due to the formation of a two-coordinate complex with chloride ions, AgCl₂⁻, AgCl's solubility in solutions can differ from what the common ion effect alone would predict. The given information states that AgCl is approximately 10 times more soluble in 1.0 M KCl than in pure water, despite the common ion effect suggesting it should be much less soluble.

Given the choices of:

A 0.20 M CaCl₂ solutionA 0.20 M AgNO₃ solutionA 0.20 M KNO₃ solution

AgCl would be most soluble in the solution that does not contain a common ion with AgCl. Because CaCl₂ and KNO₃ are both salts with different ions than Ag+ and Cl−, they would not directly provide a common ion that would decrease the solubility of AgCl through the common ion effect. Whereas the AgNO₃ solution contains Ag+ ions which would vastly decrease the solubility of AgCl due to the common ion effect. Therefore, the AgCl is most soluble in the 0.20 M KNO₃ solution (Choice C), because it does not supply any common ions that could reduce its solubility.

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When does a physical change occur

Answers

A physical change occurs when something is altered. Such as cutting a piece of paper or chopping a piece of wood into pieces.  Melting ice, breaking glass, evaporating liquids are go through a physical change.

When a mercury-202 nucleus is bombarded with a neutron, a proton is ejected. What element is formed?

Answers

That will make a gold-202 nucleus.

Explanation

Refer to a periodic table. The atomic number of mercury Hg is 80.

Step One: Bombard the [tex]\displaystyle ^{202}_{\phantom{2}80}\text{Hg}[/tex] with a neutron [tex]^{1}_{0}n[/tex]. The neutron will add 1 to the mass number 202 of [tex]^{202}_{\phantom{2}80}\text{Hg}[/tex]. However, the atomic number will stay the same.

New mass number: 202 + 1 = 203.Atomic number is still 80.

[tex]^{202}_{\phantom{2}80}\text{Hg} + ^{1}_{0}n \to ^{203}_{\phantom{2}80}\text{Hg}[/tex].

Double check the equation:

Sum of mass number on the left-hand side = 202 + 1 = 203 = Sum of mass number on the right-hand side.Sum of atomic number on the left-hand side = 80 = Sum of atomic number on the right-hand side.

Step Two: The [tex]^{203}_{\phantom{2}80}\text{Hg}[/tex] nucleus loses a proton [tex]^{1}_{1}p[/tex]. Both the mass number 203 and the atomic number will decrease by 1.

New mass number: 203 - 1 = 202.New atomic number: 80 - 1 = 79.

Refer to a periodic table. What's the element with atomic number 79? Gold Au.

[tex]^{203}_{\phantom{2}80}\text{Hg} \to ^{202}_{\phantom{2}79}\text{Au} + ^{1}_{1}p[/tex].

Double check the equation:

Sum of mass number on the left-hand side = 203 = 202 + 1 = Sum of mass number on the right-hand side.Sum of atomic number on the left-hand side = 80 = 79 + 1 = Sum of atomic number on the right-hand side.

A gold-202 nucleus is formed.

How does the charge of one electron compare to that of another electron? How does it compare with the charge of a proton? How do the masses of protons and electrons compare?

Answers

Answer:

a) The charge of one electron is the same charge of another electron.

b) The charge of one electron  has the same magnitude and opposite sign as the charge of a proton. The charge of an electron is negative by convention and the charge of a proton is positive by convention.

c) The mass of a proton is about 1,836 times the mass of an electron.

Explanation:

1) Electron discovery is due to J.J Thompson who is responsible for the famous experiment of the cathode-rays tube.  J.J Thompson, in 1897, found that cathode rays could be deflected by an electric field. He could establish that electrons had negative charge, and also determined the approximate the ratio of its charge to the mass. Yet, he could not determine such magnitudes.

2) Later on, Ernest Rutherford,  with the famous gold foil experiment, found that all of the positive charge (proton) and essentially all of the mass of the atom is concentrated in a tiny region which he named the nucleus.

3) Since, the atom has the same number of electrons and protons, and it is neutral, the charge magnitude of the charges electrons and protons are equal.

4) Robert Millikan, 1908 - 1917, was able to determine the charge of the electron, with which the mass was also determined.

The accepted relative values for the subatomic particles are:

Particle   Relative mass Relative charge

Proton           1                              +1

Neutron        1                                0

Electron        1/ 1,836                    -1

Answer:

all electrons have same charge. Electron is equal and opp to proton

Protean mass of electron

Explanation:

To determine the pH of a solution using a pH indicator paper, you need a .

Answers

Answer:

color key

creating a color key

Have known pH values

Explanation:

To determine the pH of a solution using a pH indicator paper, you need a Colour key.

What is pH value and colour key?pH is a measure of how acidic/basic water is. The range goes from 0 - 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.pH indicators are weak acids that exist as natural dyes and indicate the concentration of H+ (H3O+) ions in a solution via color change. A pH value is determined from the negative logarithm of this concentration and is used to indicate the acidic, basic, or neutral character of the substance you are testing.

Colour key is need determine the pH of a solution.

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Which of the following is the best lewis symbol for oxygen?

Answers

Final answer:

The best Lewis symbol for oxygen in O2 is :O=O:, showing a double bond and octets for each oxygen atom. This structure, however, does not explain the paramagnetic properties of oxygen, which are due to unpaired electrons not depicted in the Lewis symbol.

Explanation:

The best Lewis symbol for oxygen, when considering the molecule O₂, is :O=O:. This Lewis structure indicates that there is an O=O double bond and each oxygen atom has eight electrons around it, satisfying the octet rule. However, this structure does not account for the paramagnetic properties of oxygen, which experimental studies have shown is due to the presence of two unpaired electrons in each oxygen molecule.

Because the Lewis structure of O₂ is expected to show all electrons as paired, there is a discrepancy with the observed magnetic behavior. Paramagnetism arises in molecules that have unpaired electrons, which is why liquid oxygen is attracted to magnetic fields despite the Lewis structure suggesting otherwise.

Energy and Specific Heat

1. Draw a graph of an exothermic reaction. Label reactants, products and ∆H.

2. Calculate the amount of energy required to raise the temperature of 3.00g of gold from 45.9 to 93.0°C.

3. 1.70g of a silvery metal requires 1000.J of energy to change its temp from 298K to 2749K. Is the metal pure silver?​

Answers

Answer:

1. Kindly, see the attached image.

2. 18.369 J.

3. Yes, the metal is pure silver.

Explanation:

1. Draw a graph of an exothermic reaction. Label reactants, products and ∆H.

Kindly, see the attached image that shows the graph of an exothermic reaction.

2. Calculate the amount of energy required to raise the temperature of 3.00 g of gold from 45.9 to 93.0°C.

To solve this problem, we can use the relation:

Q = m.c.ΔT.

Where, Q is the amount of energy required to raise the temperature of gold (J).

m is the mass of the gold (m = 3.0 g).

c is the specific heat of gold (c = 0.13 J/g.°C).

ΔT is the temperature difference between the initial and final T (ΔT = 93.0 °C - 45.9 °C = 47.1 °C).

∴ Q = m.c.ΔT = (3.0 g)(0.13 J/g.°C)(47.1 °C) = 18.369 J.

3. 1.70 g of a silvery metal requires 1000.0 J of energy to change its temp from 298 K to 2749 K. Is the metal pure silver?

To determine wither the metal is pure or not, we should calculate the specific heat (c) of Ag and compare it with the reported value in the table.

As mentioned in details in the second point, we can use the relation:

Q = m.c.ΔT

Q = 1000.0 J, m = 1.70 g, ΔT = 2749 - 298 = 2451 °C.

∴ c = Q/(m.ΔT) = (1000.0 J)/(1.70 g)(2451 °C) = 0.239 J/g.°C ≅ 0.24 J/g.°C.

The calculated value is the same as the value reported in the table, so the metal is pure silver.

a propane tank containing 55l has 2.46 moles of the gas C3 is propane what would the number of moles if 1/2 of the gas is used

Answers

Answer;

= 1.23 moles

Explanation;

V1/n1 = V2/n2

V1 = 55 L, n1 =2.46 moles

1/2 of the gas was used and thus; 1/2 or 27.5 L remained.

Therefore;

55 L/2.46 moles = 27.5 L/ n2

n2 = (2.46 × 27.5)/55

    = 1.23 moles

The number of moles if 1/2 of the gas is used is mathematically given as

n2= 1.23 moles

What would the number of moles if 1/2 of the gas is used?

Question Parameter(s):

a propane tank containing 55l

has 2.46 moles of the gas C3 is propane

Generally, the equation for the volume  is mathematically given as

V1/n1 = V2/n2

Therefore

55 L/2.46  = 27.5 L/ n2

n2 = (2.46 * 27.5)/55

n2= 1.23 moles

In conclusion, the number of moles

n2= 1.23 moles

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What is the ratio of Al ions to S ions in a neutral compound? 1:1 2:1 2:3 3:2

Answers

the ratio of Al ions to S ions would be 2:3

Answer:2:3

Explanation: on edginuity

The rate of a chemical reaction can be measured as the rate of appearance of any of the products or as the rate of disappearance of any of the reactants. These relative rates of reaction are related through the stoichiometry of the overall reaction. For example, the rate of the reaction shown below can be determined by measuring the initial rate of disappearance of I-, -D[I-]/Dt. ClO3-(aq) + 9I- (aq)+ 6 H+ (aq) → 3I-3 (aq) + Cl-(aq) + 3H2O If the initial rate of disappearance of I- under a given set of experimental conditions is 81.1 x 10-3 M/s then what is the rate of disappearance of ClO3- under those same experimental conditions? Enter your answer with units.

Answers

The rate of disappearance of the ClO₃⁻ ion is equal to 9.01 ×10⁻³ M/s.

What is the rate of the chemical reaction?

The rate of reaction can be defined as the speed at which the products are produced or the reactants are consumed in a chemical reaction. The rate provides information about the time frame under which a reaction can be completed.

The rate of reaction can be described as the speed of a chemical reaction at which reactants are converted into products. Some reactions are instantaneous, while some take a little longer to reach the final equilibrium.

Given the chemical reaction is:

[tex]ClO_3^-(aq) + 9I^- (aq)+ 6 H^+ (aq) \longrightarrow 3I^{-3} (aq) + Cl^-(aq) + 3H_2O[/tex]

The initial rate of disappearance of I⁻ ion = 81.1 ×10⁻³ M/s.

The rate of disappearance of iodide ion is given by:

[tex]-\frac{D[I^-]}{Dt} =81.1\times 10^{-3}[/tex]

The relation between the rate of disappearance of I⁻ and ClO₃⁻ ion:

[tex]-\frac{D[ClO_3^-]}{Dt} =-\frac{1}{9} \frac{D[I^-]}{Dt}[/tex]

[tex]-\frac{D[ClO_3^-]}{Dt} =-\frac{1}{9} \times 81.1 \times 10^{-3}[/tex]

[tex]\frac{D[ClO_3^-]}{Dt} = 9.01 \times 10^{-3}M/s[/tex]

Therefore, the rate of the disappearance of ClO₃⁻ ion is equal to 9.01 ×10⁻³ M/s when the initial rate of disappearance of I⁻ is  81.1 ×10⁻³ M/s.

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In the presence of hydrogen sulfide, silver oxidizes to form silver sulfide (silver tarnish). It forms a black film on the surface of silver. 4Ag 2H2S O2→2Ag2S 2H2O One way to reverse the chemical reaction and turn silver sulfide back into silver is by immersing the silver in an aluminum container filled with a hot solution of sodium bicarbonate. Metals like aluminum have a greater affinity for sulfur than silver. This tarnish-removal method uses a chemical reaction to convert the silver sulfide back into silver, resulting in no net loss of silver. The reaction between silver sulfide and aluminum takes place in the presence of a sodium bicarbonate (NaHCO3) solution, resulting in the transfer of sulfur atoms from silver to aluminum, freeing the silver metal and forming aluminum sulfide. The reaction can be summarized as follows: when silver sulfide reacts with aluminum, silver sulfide is reduced to form silver and aluminum is oxidized to form aluminum sulfide. Complete the balanced chemical equation for the reaction, showing the formation of silver metal from silver sulfide in the presence of aluminum metal. Express your answer as the products of a chemical equation. View Available Hint(s) 3Ag2S 2Al → 3 A g 2 S 2 A l →

Answers

The equation is:

3AgS2 +  4Al  ---> 2Al2S3 + 3Ag

Answer: The balanced chemical equation is written below.

Explanation:

Single displacement reaction is defined as the reaction in which more reactive element displaces a less reactive element from its chemical reaction.

The reactivity of metal is determined by a series known as reactivity series. The metals lying above in the series are more reactive than the metals which lie below in the series.

[tex]A+BC\rightarrow AC+B[/tex]

The chemical equation for the reaction of silver sulfide with aluminium follows:

[tex]3Ag_2S+2Al\rightarrow 6Ag+Al_2S_3[/tex]

By Stoichiometry of the reaction:

3 moles of silver sulfide reacts with 2 moles of aluminium metal to produce 6 moles of silver metal and 1 mole of aluminium sulfide

Hence, the balanced chemical equation is written above.

Which is a spectator ion in the reaction between these two solutions?

BaBr2(aq) + Na2SO4(aq) →

A. Br– (aq)

B. BaBr2(aq)

C. Ba2+(aq)

D. SO42–(aq)


Answers

Im not sure what it is but i will try      

BaCl₂(aq) + Na₂SO₄(aq) = BaSO₄(s) + 2NaCl(aq)

Ba²⁺(aq) + 2Cl⁻(aq) + 2Na⁺(aq) + SO₄²⁻(aq) = BaSO₄(s) + 2Na⁺(aq) + 2Cl⁻(aq)

Ba²⁺(aq) + SO₄²⁻(aq)= BaSO₄(s)

The ionic reaction is

Ba2+ + 2 Br- + 2 Na+  + SO42----->   2 Na+ + 2Br- + BaSO4.

Na+ and Br- are on both sides of the equation so they are spectator ions.

The answer is A Br- (aq).

A system at equilibrium contains i2(g) at a pressure of 0.21 atm and i(g) at a pressure of 0.23 atm . the system is then compressed to half its volume. find the pressure of i when the system returns to equilibrium.

Answers

The pressure would be 6000 Newton’s

The pressure of I when the system returns to equilibrium is 0.589 atm.

What is equilibrium?

Equilibrium is defined as a state of a reversible chemical process in which there is no net change in the quantity of reactants and products.

To calculate the pressure we considered the equation

I2 -> 2Ig

Kp = I² / I2

     = (0.23)² / 0.21 = 0.25

I2 at initial = 2 x 0.21 = 0.42

I2 at equilibrium = 0.42 - x

Ig at initial = 2 x 0.23 = 0.46

Ig at equilibrium = 0.46 - 2x

Solving x using equilibrium constant

0.25 = (I)² / I2 = (0.46 + 2x)² / 0.42-x

0.25 (0.42 - x) = (0.46 + 2x)²

0.105 - 0.25x = 0.1764 + 4x²

-0.25 - 4x² = 0.1764 - 0.105

4.25 x² = 0.0714

x² = 0.714 / 4.25

x² = 0.0168

x = 0.129 atm

PI2 = 0.42 + 2x0.129

PI2 = 0.678 atm

PI = 0.46 + 0.129

PI = 0.589 atm

Thus, the pressure of I when the system returns to equilibrium is 0.589 atm.

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A reaction occurs when solid X is placed into solution Y. As a result, the temperature of the new solution increases by 3°C. The temperature rises another 2°C when more of solid X is added to the solution. What does this indicate about the effect of adding more solid?

Answers

Final answer:

The increase in temperature when solid X is added to solution Y indicates an exothermic reaction, and the further increase with additional solid could be due to supersaturation, the disturbance of equilibrium, and additional exothermic reactions.

Explanation:

When solid X is added to solution Y and the temperature rises, this indicates an exothermic reaction, or a reaction that releases heat. The solubility of the solid in the solution may also be temperature-dependent, potentially leading to a supersaturated solution if the temperature is cooled after the solute is added. This supersaturated solution is relatively stable, but adding more solid or initiating other forms of agitation can disturb this equilibrium and trigger further reactions, potentially causing additional temperature changes. Note that this behavior is similar to certain hand warmer mechanisms that take advantage of such exothermic reactions and solubility behaviors to generate heat.

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What are the concentrations of hydroxide and hydronium ions in a solution with a pH of 4.6?


1.3 × 10–4 M H3O+ and 7.7 × 10–11 M OH–

2.5 × 10–5 M H3O+ and 4.0 × 10–10 M OH–

7.9 × 10–6 M H3O+ and 1.3 × 10–9 M OH–

8.7 × 10–7 M H3O+ and 1.1 × 10–8 M OH–

Answers

Answer:

2.5 × 10–5 M H3O+ and 4.0 × 10–10 M OH–

Explanation:

pH = - log[H3O+]

Therefore;

pH = - log[H3O+] = 4.6

Hence;

[H3O+]  = 10^-4.6

             = 2.51 ×10^-5 M

             = 2.5 ×10^-5 M

Additionally;

pH + pOH = 14

Thus; pOH = 14 -pH

                  = 14 -4.6

                  = 9.4

but; pOH = - log [OH-]

Therefore;

[OH-] = 10^-9.4

        = 3.98 × 10^-10 M

        =  4 × 10^-10 M

Answer:

2.5 × 10–5 M H3O+ and 4.0 × 10–10 M OH–

A solution of 20.0 g of which hydrated salt dissolved in 200 g H2O will have the lowest freezing point? (A) CuSO4 • 5 H2O (M = 250) (B) NiSO4 • 6 H2O (M = 263) (C) MgSO4 • 7 H2O (M = 246) (D) Na2SO4 • 10 H2O (M = 286) The correct answer is D, but I really don't know WHY, so I ask... Thank you very much for your help and explanation ! :)

Answers

Answer:

(D) Na₂SO₄•10H₂O (M = 286).

Explanation:

The depression in freezing point of water by adding a solute is determined using the relation:

ΔTf = i.Kf.m,

Where, ΔTf is the depression in freezing point of water.

i is van't Hoff factor.

Kf is the molal depression constant.

m is the molality of the solute.

Since, Kf and m is constant for all the mentioned salts. So, the depression in freezing point depends strongly on the van't Hoff factor (i).van't Hoff factor is the ratio between the actual concentration of particles produced when the substance is dissolved and the concentration of a substance as calculated from its mass.

(A) CuSO₄•5H₂O:

CuSO₄ is dissociated to Cu⁺² and SO₄²⁻.

So, i = dissociated ions/no. of particles = 2/1 = 2.

(B) NiSO₄•6H₂O:

NiSO₄ is dissociated to Ni⁺² and SO₄²⁻.

So, i = dissociated ions/no. of particles = 2/1 = 2.

(C) MgSO₄•7H₂O:

MgSO₄ is dissociated to Mg⁺² and SO₄²⁻.

So, i = dissociated ions/no. of particles = 2/1 = 2.

(D) Na₂SO₄•10H₂O:

Na₂SO₄ is dissociated to 2 Na⁺ and SO₄²⁻.

So, i = dissociated ions/no. of particles = 3/1 = 3.

∴ The salt with the high (i) value is Na₂SO₄•10H₂O.

So, the highest ΔTf resulted by adding Na₂SO₄•10H₂O salt.

Which of the listed statements describes the results of the following reaction? C 6 H 12 O 6 + 6 O 2 → 6 CO 2 + 6 H 2 O + Energy A) C 6 H 12 O 6 is oxidized and O 2 is reduced. B) O 2 is oxidized and H 2 O is reduced. C) CO 2 is reduced and O 2 is oxidized. D) O 2 is reduced and CO 2 is oxidized.

Answers

Answer:

Answer: option A) C₆H₁₂O₆ is oxidized and O₂ is reduced

Explanation:

1) Chemical equation:

C₆H₁₂O₆ + 6O₂ → 6CO₂+ 6H₂O +  Energy

2) Oxidation states in the reactants

a) C₆H₁₂O₆

The oxidation state of all H atoms is +1.

The oxidation state of all O atoms is -2

Here, you will see that the oxidation state of carbon in glucose is zero.

There are 6 atoms of C which may have different oxidation number.

You can work with a more developed formula such as:

   

     O    OH   OH    OH   OH  OH

     ║     |        |         |       |       |

H - C¹ -  C²  -  C³  -  C⁴ - C⁵  - C⁶ - H

             |        |         |       |       |

             H     H       H      H     H

C¹ is bonded to one O, one C and  one H.

        ∴ C¹ 's oxidation state may be determined from x + (−2) + (0) + (+1) = 0

            ⇒ x = + 1

C²,C³,C⁴, and C⁵ are bonded to one OH radical, two C atoms, and one H atoms.

       ∴ Their oxidation states are given by:

            x + (−1) + 2(0) + (+1) = 0 ⇒ x=0

C⁶ is bonded to one OH, one C, and two H atoms.

        ∴ C⁶ 's oxidation state may be determined from:

             x + (−1) + (0) + 2(+1) = +1 ⇒ x = −1

     

The overall oxidation state of C in that molecules is the algebraic sum of all each of C atom oxidation states: +1 + 0 + 0 + 0 + 0 + (-1) = 0

b) O₂ : since it is alone, its oxidation state is zero.

3) Oxidation states in the products

c)  CO₂

Oxidation state of O: -2

Oxidation state of C: +4

d) H₂O

Oxidation state of O: -2

Oxidation state of H: + 1

4) Changes in the oxidation state

C changed from 0 in the reactats to +4 in the products

O changed from O in the reactants to - 2 in the products

5) Conclusion:

Since C increased its oxidation state, it is oxidized

Since O reduced its oxidation state, it is reduced.

Answer: option A) C₆H₁₂O₆ is oxidized and O₂ is reduced

Answer:

C₆H₁₂O₆ is oxidized and O₂ is reduced.

Explanation:

Consider the reaction between no and cl2 to form nocl. 2no(g) + cl2(g) ⇌ 2nocl(g) a reaction mixture at a certain temperature initially contains only [no] = 0.50 m and [cl2] = 0.50 m. after the reaction comes to equilibrium, the concentration of nocl is 0.30 m. what is the value of kc at this temperature?

Answers

Final answer:

The reaction given is 2NO(g) + Cl2(g) ⇌ 2NOCl(g). The initial concentrations of NO and Cl2 are 0.50 M. At equilibrium, concentration of NOCl is 0.30 M, while concentrations of NO and Cl2 are 0.20 M. The equilibrium constant Kc for this reaction at this temperature is thus calculated to be 9.0 M⁻².

Explanation:

The value of Kc at a given temperature for a reaction can be calculated using the equilibrium concentrations of the reactants and products in the chemical equation. The reaction described here is 2NO(g) + Cl2(g) ⇌ 2NOCl(g).

At equilibrium, the concentration of NOCl is given as 0.30 M, while we are not provided with the equilibrium concentrations of NO and Cl2, but we know that initially they were both 0.50 M.

The expression for the equilibrium constant Kc in this case would be: Kc = [NOCl]² / ([NO]² [Cl2])

Therefore, calculating equilibrium concentrations of NO and Cl2 from the balanced chemical equation since each 2 moles of NO and Cl2 react to form 2 moles of NOCl, [NO] = [Cl2] = 0.50M - 0.30M = 0.20M.

Substituting these equilibrium concentrations, the value of the Kc becomes:

Kc = (0.30²) / (0.20² * 0.20) = 9.0 M⁻²

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What type of molecule is formed when a halogen combines with hydrogen

Answers

When a halogen combines with hydrogen, a covalent molecule is formed.

When a halogen, such as chlorine (Cl), fluorine (F), bromine (Br), or iodine (I), combines with hydrogen (H), they typically form covalent molecules. In covalent bonding, atoms share electrons to achieve a stable electron configuration. Halogens have one electron missing in their outermost electron shell, while hydrogen needs one more electron to complete its shell. To satisfy these electron needs, they share electrons through a covalent bond.

In hydrogen chloride (HCl), hydrogen shares its electron with chlorine, forming a covalent bond. This sharing allows both atoms to achieve a stable electron configuration. Covalent molecules, in contrast to ionic compounds, involve the sharing of electrons rather than the transfer of electrons, resulting in the formation of discrete molecules with relatively low melting and boiling points.

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This chart shows discrpitions of the atoms for four different substances. Which substance is a solid

Answers

Atoms that are bunched together the closest are solids.

Oxidation/reduction (redox) reactions like this: 2H2(g) + O2(g) ⇒ 2H2O(l) will occur spontaneously. To make the reaction proceed in the reverse direction, you must put energy (electricity) into reaction. This is called

Answers

The process is called electrolysis.

Which of the following types of reactions would decrease the entropy within a cell? A. Dehydration reaction, B. Hydrolysis, C. Respiration, D. Digestion, E. Catabolism

Answers

Answer;

A. Dehydration reactions.

Explanation;Dehydration reactions refer to chemical events where a water molecule is lost because of the presence of another reacting molecule.Dehydration reaction is said to cause a decrease in entropy in various cells. Entropy within a cell refers to a state of inner instability secondary to different energies provided by the different molecular components.When the water component is removed,  there will be less molecular energy and therefore decreased entropy.

A researcher wants to determine if a unicellular organism he discovered is an autotroph or a heterotroph. He radioactively labels the carbon in CO2 and C6H12O6, and exposes one culture of his organism to the labeled CO2 and another culture to the labeled C6H12O6. What would happen if his organism is an autotroph?

A. Labeled carbon would be seen in the carbohydrates of organisms exposed to CO2.
B. Labeled carbon would be seen in the carbohydrates of organisms exposed to C6H12O6.
C. Labeled carbon would not be seen in the carbohydrates of either culture.
D. Labeled carbon would be seen in carbohydrates of both cultures.

Answers

Answer:

A

Explanation:

Autotrophs utilize the energy from  sunlight to reduce carbon dioxide to carbohydrates (glucose). The energy from the sunlight is used to split water into H+ and O2- and the H+ used in the reduction process. The labeled carbon in the carbon dioxide will, therefore, be incorporated by the autotrophs in the carbohydrates made in photosynthesis.  

In an electromagnet, you can increase the strength of the magnetic field by Question 6 options: decreasing the thickness of the wires increasing the number of coils in the wires

Answers

The electromagnetic strength can be increased by increasing the number of coils in the wires but not by decreasing the thickness of the wires - there is no mathematical relationship between wire thickness and field strength.

Hope this helps!

How would you describe the sequence of reactions in a hydrogen bomb

Answers

Final answer:

A hydrogen bomb relies on a nuclear fission bomb to trigger a fusion reaction between deuterium and tritium using lithium deuteride as the fusion fuel. The explosion is enhanced by a U-238 shell which reflects neutrons back into the fuel and fissions to add to the energy output. This process results in a bomb significantly more powerful than atomic bombs.

Explanation:

The construction and subsequent chain of reactions in a hydrogen bomb, or a thermonuclear bomb, typically begin with a nuclear fission bomb. The fission bomb, when exploded, produces extremely high temperatures necessary for fusion to occur. A common method is to use lithium deuteride as the fusion fuel, which is in close proximity to the fission bomb. Upon detonation, the fission bomb's gamma rays heat and compress the fusion fuel. Meanwhile, neutrons from the fission reaction cause the lithium to undergo a reaction to generate tritium: n + 6Li → ³ H + ª He. This newly generated tritium then fuses with deuterium in the reaction 2H+ ³H → He + n + 17.6 MeV, producing helium, another neutron, and a significant amount of energy.

Additional fusion and fission fuels are enclosed within a dense shell of U-238. This uranium shell serves two purposes: it reflects some neutrons back into the fuel to enhance fusion, and the fast-moving neutrons cause the uranium itself to fission, adding to the overall energy output of the bomb.

The first hydrogen bomb was detonated in 1952, but unlike the atomic bomb, a hydrogen bomb has never been used in warfare. Thermonuclear bombs are significantly more powerful than atomic ones - the power of a modern hydrogen bomb is approximately 1000 times that of the bombs dropped on Hiroshima and Nagasaki during World War II.

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HELP ASAP PLEASE!!!!

Two organic molecules with the same formula but different structures are called:

1
alkanes

2
alkenes

3
alkynes

4
isomers

5
polymers

Answers

The answer is 4) Isomers because functional isomers are structural isomers that have the same molecular formula (that is, the same number of atoms of the same elements), but the atoms are connected in different ways so that the groupings are dissimilar.
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