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.
Which of the following reactions have a positive ΔSrxn? Check all that apply.2A(g)+B(g)----->C(g)A(g)+B(g)----->3C(g)2A(g)+3B(g)----->4C(g)2A(g)+B(s)------->3C(g)
Answer:
The reactions that have a positive ΔSrxn are the second and the fourth:
A(g) + B(g) → 3C(g), and 2A(g) + B(s) → 3C(g)Explanation:
ΔSrxn stands for the change in entropy of a reaction.
Since ΔSrxn equals Final entropy - Initial entropy, a positive ΔSrxn (ΔSrxn > 0) means that the entropy increases.
Given the chemical equations for some reactions, you can identify the direction of the change of entropy (increase or decrease) by inspection, using basic definitions and principles.
These are:
Entropy is a measure of the level of disorder of a system.The particles of the gases are in a state of greater disorder than the particles of the liquids, and the particles of liquids are in a state more disordered than those of the solids.In conclusion, under other conditions constant, the entropy of a system of gases is greater than the entropy of a system of liquids, and the entropy of a system of liquids is greaer than the entropy of a system of solids.A system with more particles has a greater entropy than a system of less particles.With those principles, you get the following results for each of the given systems.
1) 2A(g) + B(g) → C(g)
Since in the product (right) side there are fewer molecules than in the reactant (left) side, you predict that the entropy decreases, and so the ΔSrxn is negative.
2) A(g) + B(g) → 3C(g)
Since in the product (right) side there are more molecules than in the reactant (left) side, you predict that the entropy increases, and so the ΔSrxn is positive.
3) 2A(g) + 3B(g) → 4C(g)
Since in the product (right) side there are fewer molecules than in the reactant (left) side, you predict that the entropy decreases, and so the ΔSrxn is negative.
4) 2A(g) + B(s) → 3C(g)
Since there are the same number of molecules in both sides, the determining factor of the change of entropy is the physical state of the components.
Since the reactant B (s) is in solid state and the only product is C(g), and it is in gas state, you predict that the entropy increases, and ΔSrxn is positive.
Conclusion: the reactions that have a positive ΔSrxn are the second and the fourth:
A(g) + B(g) → 3C(g), and 2A(g) + B(s) → 3C(g)It takes the Earth _______ to complete one revolution around the Sun. A. One year B. One day C. One month D. One hour
It'll take one year for the Earth to complete one revolution around the Sun.
How long does it take for the Earth to revolve around the Sun?
AnswerYour answer is (A. One Year) or 365.25 days.
Hope this helps! :D
Calculate the pH during the titration of 30.00 mL of 0.1000 M HCOOH(aq) with 0.1000 M NaOH(aq) after 29.3 mL of the base have been added. Ka of formic acid = 1.8 x 10-4.
The moles of acid (HCOOH) and base (NaOH) were calculated based on their respective volumes and concentrations. The moles of excess acid, along with the total volume, were used to determine the concentration of excess acid. Using this concentration, the pH during the titration was found to be 3.336.
Calculate the moles of acid and base:
Moles of HCOOH = (Volume) * (Concentration) = (30.0 mL) * (0.1000 M)
Moles of NaOH = (29.3 mL) * (0.1000 M)
Calculate the moles of excess acid:
Moles of excess HCOOH = (Moles of HCOOH) - (Moles of NaOH)
Calculate the concentration of excess acid:
Concentration of excess HCOOH = (Moles of excess HCOOH) / (Total volume)
Total volume = 30.0 mL + 29.3 mL
Use the concentration of excess acid to find [H+]:
[H+] = sqrt(Ka * Concentration of excess HCOOH)
The formula [H+] = sqrt(Ka * C) comes from the equilibrium expression for a weak acid, where C is the concentration of the acid.
Calculate pH:
pH = -log[H+]
Now, let's substitute the values:
Moles of HCOOH = (30.0 mL) * (0.1000 M) = 0.003 moles
Moles of NaOH = (29.3 mL) * (0.1000 M) = 0.00293 moles
Moles of excess HCOOH = 0.003 moles - 0.00293 moles = 6.72 x 10^-5 moles
Total volume = 30.0 mL + 29.3 mL = 59.3 mL = 0.0593 L
Concentration of excess HCOOH = (6.72 x 10^-5 moles) / (0.0593 L) = 1.13 x 10^-3 M
[H+] = sqrt((1.8 x 10^-4) * (1.13 x 10^-3 M)) = 4.61 x 10^-4 M
pH = -log(4.61 x 10^-4) = 3.336
Therefore, the pH during the titration is 3.336.
Determine the formula unit for the compound formed when each pairs of ions interact.
The formula unit for the compound formed when each pairs of ions interact are as mentioned below-
Li⁺ and 0²⁻ forms Li2O
Mg²⁺ and S²⁻ forms Mg S
A1³⁺ and CI⁻ forms AlCl3Na⁺ and
N³⁻ forms Na3N
What do you mean by the formula unit of the compound?The formula unit is the smallest unit of an ionic substance that tells us of the ratio in which ions are combined in the ionic compound.
The formula unit for the compounds formed depends on the valency of the combining ions.
Usually, the formula unit is written on the valency of the ions.
The formula unit for the compound formed when each pairs of ions interact are therefore as written-
Li⁺ 0²⁻ forms Li2O
Mg²⁺S²⁻ forms Mg S
A1⁺³ CI⁻ forms AlCl3 and
Na+ N³⁻ forms Na3N.
Learn more about formula unit, here:
https://brainly.com/question/19293051
#SPJ6
Why does every chemical reaction require a certain amount of activation energy?
A.
Energy is released when the reactants begin to react.
B.
Energy lost to the environment during the reaction must be replaced.
C.
Forming the activated complex requires energy.
D.
The products have more potential energy than the activated complex.
E.
The reactants have less potential energy than the products.
Answer: C. Forming the activated complex requires energy.
Explanation:
Activation energy is the extra energy that must be supplied to reactants in order to cross the energy barrier and thus convert to products.
In order that reactants change into products, they have to cross an energy barrier. When reactant molecules absorb energy, their bonds are loosened and new loose bonds are formed between them.
The intermediate thus formed is called as activation complex. It is unstable and immediately dissociates to form stable products by release of energy.
One difference between first- and second-order reactions is that ________. One difference between first- and second-order reactions is that ________. the half-life of a first-order reaction does not depend on [A]0; the half-life of a second-order reaction does depend on [A]0 the rate of both first-order and second-order reactions do not depend on reactant concentrations the rate of a first-order reaction depends on reactant concentrations; the rate of a second-order reaction does not depend on reactant concentrations a first-order reaction can be catalyzed; a second-order reaction cannot be catalyzed None of the above are true.
Answer:
(first choice)
One difference between first- and second-order reactions is that the half-life of a first-order reaction does not depend on [Ao]; the half-life of a second-order reaction does depend on [Ao].
Explanation:
1) First order reactions' model
This is a brief deduction of the first order reactions' half-life
Equation: aA +b B → cC + dDrate: r = - d[A]/dt = k[A]Integration:- d[A]/[A] = kdt ⇒ - ln { [A]/[Ao] } = kt
Half-life:t half-life = T
[A] = (1/2) [Ao] ⇒- ln { [A]/[Ao] } = - ln (1/2) = ln(2) = kT
⇒ T = ln(2) / T
Conclusion:* The half-life of a first order reaction is a constant; it does not depend on the initial concentration of the reactants, it only depend on the rate constant.
2) Second order reaction's model:
This is a brief deduction of the second order reactions' half-life
Equation: aA +b B → cC + dDrate: r = - d[A]/dt = k[A]²Integration:- d[A]/[A]² = kdt ⇒ 1/[Ao] - 1/[A] = kt
Half-life:t half-life = T
[A] = (1/2) [Ao] ⇒ 1 / [Ao] - 1 / {2[Ao]} = 1 / {2[Ao]} = kT
⇒ T = 1 / {2k[Ao] }
Conclusion:* The half-life of a second order reaction depends on the initial concentration and the rate constant.
3) Final conclusion:
We have found that while the half life of a first order reaction is does not depend on the initial concentration, the half-life of a second order reaction does depends on the initial concentration. Hence, the correct answer to the question is:
One difference between first- and second-order reactions is that the half-life of a first-order reaction does not depend on [Ao]; the half-life of a second-order reaction does depend on [Ao].
The key distinction between first- and second-order reactions lies in the impact of initial reactant concentrations on half-life. In first-order reactions, half-life remains constant, irrespective of initial reactant concentration. For second-order reactions, half-life decreases as reactant concentration increases.
Explanation:One major difference between first- and second-order reactions is found in the relationship between reaction half-life and initial reactant concentration. In a first-order reaction, the half-life is independent of initial reactant concentration, meaning it stays consistent regardless of the amount of reactant present initially. On the other hand, in a second-order reaction, the half-life is dependent on the initial reactant concentration; specifically, the half-life decreases as the concentration increases. The relationship for a second-order reaction follows this formula: t1/2 is inversely proportional to the initial concentration [A]₀. As the reaction proceeds and the reactant concentration decreases, the half-life increases.
Learn more about Chemistry of Reaction Orders here:https://brainly.com/question/30564957
#SPJ3
photon is a massless bundle of electromagnetic energy. Question 16 options: TRUE FALSE
This is true. this bundle results as a result of electron transition between energy levels of a metal upon impact by a fast moving electron. This bundle moves with the speed of light in a vacuum which is approximately 3.0×10⁸m/s.
Why do you think some of the indicators used in experiment 2 were different than the ones used in experiment?
If you were a water molecule in a glass of water how would you best describe your relationship with the water molecules around you? A.) always near the same molecules B.) held in a rigid pattern with other molecules C.) consonantly running into different molecules D.) moving slowly away from some molecules and quickly towards others
Answer: A.) always near the same molecules
Explanation:
The capillary action of water is the movement of water from roots to the leaves and other plant parts against the gravitational force of earth. This conduction of water is facilitated by the two properties of water that are cohesion and adhesion.
Cohesion can be define as the attraction of the molecule of water towards another water molecule. Adhesion can be define as the attraction of the molecules of water towards the different type of molecule.
Among the given options A is the correct option because of the fact that the attraction of water molecules among themselves gives water a definite volume in the glass. Cohesive forces keeps the water molecules close together.
As a water molecule in a glass of water, you are constantly running into different molecules due to the higher kinetic energy in the liquid state which allows free movement, with transient hydrogen bonding creating temporary clusters.
Explanation:In a liquid state, such as being a water molecule in a glass of water, you would experience a dynamic and ever-changing environment. If we imagine ourselves as a water molecule, we would be in constant motion, with hydrogen bonds forming and breaking as we interact with our neighboring molecules. Unlike in a solid where molecules are in a fixed position and only vibrate, in a liquid state, the molecules have more energy allowing them to move around freely, although they are still close to each other. This movement leads to different clusters or ''clumps'' of molecules circulating within the confines of the container.
The correct answer to the given question is C.) constantly running into different molecules. Water molecules in a liquid phase such as in a glass of water are not held in a rigid pattern, nor are they always near the same molecules because their increased kinetic energy allows them to move and trade places with one another. This movement is random yet constrained by the surface of the liquid. The hydrogen bonding that occurs is transient - while it does create some structure, it is not rigid or permanent.
Help!!!!!!!!!!!!!!!!!!
rate = k{A}^2{B}^2
When having a reaction both need to be included, so we know that D wouldn't work for us. But since they are being combined they would both be squared with 2. Then they would form compounds of C and D.
If you combine 370.0 mL of water at 25.00 °C and 110.0 mL of water at 95.00 °C, what is the final temperature of the mixture? Use 1.00 g/mL as the density of water.
The final temperature of a mixture of two volumes of water at different temperatures can be found using the principle of heat transfer. The heat lost by the hotter water will be equal to the heat gained by the cooler water. The final temperature is computed using the formula for heat, q = mcΔT.
Explanation:The exercise in question involves the concept of heat transfer, a fundamental concept in Physics. When two bodies of different temperatures are combined, the heat will flow from the hotter to the cooler body until thermal equilibrium is reached, and both bodies have the same temperature.
Using the principle of heat transfer, we consider that the heat lost by the hotter water will be equal to the heat gained by the cooler water. The formula for heat is q = mcΔT where m is mass, c is specific heat, and ΔT is the change in temperature. Using the density of water as 1 g/mL, we calculate the mass of both volumes of water (370.0 g for the cooler water and 110.0 g for the hotter water). The specific heat of water is 4.184 J/g °C. With this, we set up the equation (370.0 g * 4.184 J/g °C * (Tfinal - 25.00 °C)) = (110.0 g * 4.184 J/g °C * (95.00 °C - Tfinal)), and solve for Tfinal, which represents the final temperature of the mixture.
Learn more about Heat Transfer here:https://brainly.com/question/13433948
#SPJ12
In the periodic table of elements, which of the following electron configurations would be the element following oxygen?
The answer would be C, because it is the follower up of oxygen.
Raising livestock for a meat-based diet depletes many natural resources, including fossil fuels. _____________ of fossil fuel is needed to produce one calorie of protein from feedlot beef. A) two calories B) five calories C) ten calories D) forty calories
The answer is D. forty calories
WILL MARK BRAINLIEST !! HELP ASAP
Which of the following is an example of a combustion reaction?
A.Photosynthesis in plants
B.Cellular respiration in humans
C.Mixing of vinegar and baking soda
D. Release of carbon dioxide on heating limestone
I am almost positive that the answer is D
Answer : The correct option is, (B) Cellular respiration in humans
Explanation :
Combustion reaction : It is defined as the hydrocarbon react with the oxygen then it react to give carbon dioxide and water as a product.
A. Photosynthesis in plants
Photosynthesis : It is a chemical process or a reaction which takes place in the green plants or the living organisms.
During this process, the carbon dioxide reacts with the water in the presence of sunlight to gives glucose and oxygen as a product.
The balanced chemical reaction will be,
[tex]6CO_2+6H_2O\overset{sunlight}\rightarrow C_6H_{12}O_6+6O_2[/tex]
B. Cellular respiration in humans
Cellular respiration : In this process, the hydrocarbon react with the oxygen to give carbon dioxide and water as a product. This reaction is a combustion reaction.
Cellular respiration is directly opposite of photosynthesis.
The balanced chemical reaction will be,
[tex]C_6H_{12}O_6+6O_2\rightarrow 6CO_2+6H_2O[/tex]
C. Mixing of vinegar and baking soda
When vinegar is react with baking soda then it gives sodium acetate, carbon dioxide and water as a product. This reaction is an acid-base reaction.
The balanced chemical reaction will be,
[tex]CH_3COOH+NaHCO_3\rightarrow CH_3COONa+H_2O+CO_2[/tex]
D. Release of carbon dioxide on heating limestone
When limestone (calcium carbonate) is heated then it decomposes to give calcium oxide and carbon dioxide as a product. This reaction is a decomposition reaction.
The balanced chemical reaction will be,
[tex]CaCO_3\rightarrow CaO+CO_2[/tex]
Hence, from this we conclude that the example of combustion reaction is, (B) Cellular respiration in humans
Derive the relationship between V1 and V2, the volumes of a gas at two pressures, P1 and P2
Answer:
P₁V₁ = P₂V₂.
Explanation:
Boyle’s Law : At constant temperature, the volume of a given quantity of a gas varies inversely with its pressure.It is clear from the data that V ∝ 1/P.Also, PV = constant.So, for two different values of both P and V:
∴ P₁V₁ = P₂V₂.
Calculate the pH of each of following buffered solutions.?a. 0.10 M acetic acid/0.25 M sodium acetate b. 0.25 M acetic acid/0.10 M sodium acetate c. 0.080 M acetic acid/0.20 M sodium acetate d. 0.20 M acetic acid/0.080 M sodium acetate
Answer:
a. 5.10.
b. 4.35.
c. 5.10.
d. 4.35.
Explanation:
a. 0.10 M acetic acid/0.25 M sodium acetate
For acidic buffer:
∵ pH = pKa + log [salt]/[Acid]
∴ pH = - log(Ka) + log [salt]/[Acid]
Ka for acetic acid = 1.8 x 10⁻⁵.
∴ pH = - log(1.8 x 10⁻⁵) + log(0.25)/(0.10)
∴ pH = 4.744 + 0.34 = 5.084 ≅ 5.10.
b. 0.25 M acetic acid/0.10 M sodium acetate
For acidic buffer:
∵ pH = pKa + log [salt]/[Acid]
∴ pH = - log(Ka) + log [salt]/[Acid]
Ka for acetic acid = 1.8 x 10⁻⁵.
∴ pH = - log(1.8 x 10⁻⁵) + log(0.10)/(0.25)
∴ pH = 4.744 - 0.34 = 4.346 ≅ 4.35.
c. 0.080 M acetic acid/0.20 M sodium acetate
For acidic buffer:
∵ pH = pKa + log [salt]/[Acid]
∴ pH = - log(Ka) + log [salt]/[Acid]
Ka for acetic acid = 1.8 x 10⁻⁵.
∴ pH = - log(1.8 x 10⁻⁵) + log(0.20)/(0.08)
∴ pH = 4.744 + 0.34 = 5.084 ≅ 5.10.
d. 0.20 M acetic acid/0.080 M sodium acetate
For acidic buffer:
∵ pH = pKa + log [salt]/[Acid]
∴ pH = - log(Ka) + log [salt]/[Acid]
Ka for acetic acid = 1.8 x 10⁻⁵.
∴ pH = - log(1.8 x 10⁻⁵) + log(0.08)/(0.20)
∴ pH = 4.744 - 0.34 = 4.346 ≅ 4.35.
The pH of various acetic acid and sodium acetate buffered solutions can be calculated using the Henderson-Hasselbalch equation. The pH values are 5.14, 4.34, 5.04, and 4.44 respectively. A good buffer should ideally have equal concentrations of acid and base.
Explanation:To calculate the pH of each buffered solution, we will use the Henderson-Hasselbalch equation, which is pH = pKa + log([A⁻]/[HA]), where [A⁻] is the molar concentration of the base (sodium acetate) and [HA] is the molar concentration of the acid (acetic acid).
Firstly, we need to know the pKa of acetic acid. The Ka of acetic acid is 1.8 x 10⁻⁵, therefore, the pKa = -log(Ka) = 4.74.
For 0.10 M acetic acid/0.25 M sodium acetate, pH = 4.74 + log(0.25/0.10) = 5.14.For 0.25 M acetic acid/0.10 M sodium acetate, pH = 4.74 + log(0.10/0.25) = 4.34.For 0.080 M acetic acid/0.20 M sodium acetate, pH = 4.74 + log(0.20/0.080) = 5.04.For 0.20 M acetic acid/0.080 M sodium acetate, pH = 4.74 + log(0.080/0.20) = 4.44.Remember, a good buffer should have about equal concentrations of both of its components for best buffering capacity.
Learn more about Buffer Solutions here:https://brainly.com/question/31367305
#SPJ3
How much energy, in calories, is required to change a 25.00g of ice at -10.00C to water at 35.00C?
How many milliliters of a 0.40 m solution of hydrochloric acid are necessary to neutralize 25 ml of a 0.20 m sodium hydroxide solution?
Answer:
12.5 mL of HCl
Explanation:
The balanced chemical equation for the neutralization reaction is as follows
NaOH + HCl —> NaCl + H2O
Molar ratio of NaOH to HCl is 1:1
For neutralization to happen the number of NaOH moles is equal to the number of HCl moles
Number of NaOH moles reacted - 0.20 mol/L x 0.025 L = 0.005 mol
Therefore number of HCl moles reacted - 0.005 mol
Concentration of HCl is 0.40 mol/L
Concentration = number of moles / volume
Rearranging the equation
Volume = number of moles / concentration
Volume = 0.005 mol / 0.40 mol/L
= 0.0125 L
Volume of HCl added is 12.5 mL
Which unit can be used to express the rate of a reaction? A. mL / s B. mL / g C. g / mL D. mL / mol E. s / mL
Answer:
A. mL/s.
Explanation:
The rate of the reaction is the change in the concentration of the reactants (decrease) or the products (increase) with time.Rate of the reaction = Δ[C]/Δt.
If we take the volume (mL) expressing the concentration. So, the unit of the rate of the reaction is (mL/s).
The term _____ describes a substance that can act as both an acid and a base.
The term amphoteric describes a substance that can act as both an acid and a base.
The ka of benzoic acid is 6.30 ⋅ 10-5. The ph of a buffer prepared by combining 50.0 ml of 1.00 m potassium benzoate and 50.0 ml of 1.00 m benzoic acid is ________.
pH = 4.20
Explanation;pKa = -log(6.30 × 10^-5)
pKa = 4.20
Moles of Benzoic acid = volume × molarity
= 0.050L × 1.00M
= 0.050moles benzoic acid
Moles of the salt = 0.050L × 1.00M
= 0.050 moles salt
Therefore;
0.050mols / 0.1 L = 0.50M
0.050mols / 0.1 L = 0.50M
Thus;
pH = 4.20 + log(0.50/0.50)
pH = 4.20
From the calculations, the pH of the solution is 4.20
What is pH?The pH is defined as the degree of acidity or alkalinity of a solution. We have to find the pH of the buffer using the Henderson–Hasselbalch equation.
Since, Ka = 6.30 × 10^-5
then pKa = -log(6.30 × 10^-5)
pKa = 4.20
Number of moles of Benzoic acid = volume × molarity
= 0.050L × 1.00M = 0.050moles benzoic acid
Number of moles of benzoate = 0.050L × 1.00M = 0.050 moles
Total volume of solution = 50 mL + 50 mL = 100 mL or 0.1 L
Molarity of acid
0.050mols / 0.1 L = 0.50M
Molarity of conjugate base
0.050mols / 0.1 L = 0.50M
Hence;
pH = 4.20 + log(0.50/0.50)
pH = 4.20
Learn more about pH:https://brainly.com/question/4083236?
Which statement is true about trends in metallic character?a) Metallic character increases as you go to the right across a row in the periodic table and as you go down a column.b) Metallic character decreases as you go to the right across a row in the periodic table and increases as you go down a column.c) Metallic character decreases as you go to the right across right across a row in the periodic table and decreases as you go down a columnd) Metallic characterdecreases as you go to the right across a row in the periodic table and increases as you go down a column
Answer:
d) Metallic character decreases as you go to the right across a row in the periodic table and increases as you go down a column.
Explanation:
Metallic character decreases as you move across a period in the periodic table from left to right. This is because the attraction between valence electron and the nucleus increases, making it difficult for loss of electrons. It occurs as atoms more readily accept electrons to fill a valence shell than lose them to remove the unfilled shell. On the other hand, Metallic character increases as you move down an element group in the periodic table. This is due to the increase in atomic radius as the number of energy levels increases.What is the symbol for the isotope of 58co that possesses 33 neutrons?
To find the symbol for the isotope of 58Co with 33 neutrons, we must account for the atomic number of cobalt (27) and the specified number of neutrons (33). The symbol would typically be Co-58 or ^58Co; however, there seems to be a discrepancy as 58Co should have 31 neutrons, not 33.
Explanation:The symbol for the isotope of 58Co with 33 neutrons is represented as Co-58 or ^58Co. To determine this, we should know that the atomic number of cobalt (Co) is 27, which means it has 27 protons. The number of neutrons is given as 33. The mass number (A) of an isotope is the sum of its protons (Z) and neutrons (N), which in this case is 27 + 33 = 60. However, there may be a slight confusion because the question mentions the symbol for the isotope of 58Co, which suggests the mass number is 58. If that's the case, and we have 27 protons, then this isotope would actually have 58 - 27 = 31 neutrons, not 33. Since the question specifies 33 neutrons, we need to clarify this before providing the correct symbol.
What is different about a reversible reaction
A reversible reaction is a chemical reaction where the reactants form products that, in turn, react together to give the reactants back. Reversible reactions will reach an equilibrium point where the concentrations of the reactants and products will no longer change.
A reversible reaction is a chemical reaction where the reactants form products that, in turn, react together to give the reactants back. Reversible reactions will reach an equilibrium point where the concentrations of the reactants and products will no longer change
A solution containing which one of the following pairs of substances will be a buffer solution?
A) RbCl, HCl
B) KBr, HBr
C) CsF, HF
D) NaI, HI
E) none of the above
Answer:
C) CsF, HF
Explanation:
A buffer is a solution that resists change in PH. It usually has a weak acid, and a base. In this case; CsF , HF would make a buffer solution such that; HF is a weak acid and F- is its conjugate baseA solution containing CsF and HF pairs of substances will be a buffer solution.
What are buffer solution?Buffer solutions are formed by the mixture of weak acid and its conjugate base or by weak base and its conjugate acid, and helps to retain the pH of the solution if any strong acid or base is added in small quantity.
Among the given pairs all pairs will form buffer solution except CsF and HF, because HF is a weak base and F⁻ is conjugate base of HF acid.
Hence, option (c) is correct i.e. CsF and HF.
To know more about buffer solutions, visit the below link:
https://brainly.com/question/8676275
What is the approximate mass of a 100-N person on Earth?
Question options:
1 kg
10 kg
100 kg
1,000 kg
Laura adds 50ml of boiling water to 100ml of ice water. if the 150ml of water is then put into a freezer, at what temperature will the water freeze?
According to what I know, if the water is pure, it always freezes at 0°C.
- Lee Hae :) Have a great day!
If 50 mL of boiling water is added to 100 mL of ice water and the entire mixture is put in a freezer, the water will freeze at 0 [tex]^oC[/tex].
Irrespective of the initial temperature, water always freezes when its temperature drops to zero degrees Celsius, 32 degrees Fahrenheit, or 273 Kelvin.
The freezing happens at the quoted temperature under standard atmospheric pressure and if the water is pure. At higher pressure, the freezing point is lower and at lower pressure, the freezing point increases.
Impurities also lower the freezing point of water
More on the freezing point of water can be found here: https://brainly.com/question/11848972
What are the formulas for the ionic compounds named sodium iodide and magnesium iodide
Sodium Iodide: NaI
Magnesium Iodide: MgI2
Ionic compound are named by giving the name of metals first. The formula of sodium iodide is NaI and the formula of magnesium iodide is MgI₂.
What are ionic compounds?Ionic compounds are formed through electron lose from a metal to a non-metal. Metals are electron rich and they will easily lose electrons to attain stability. Whereas, non-metals are mostly electron deficient and they gain electron from metals to form ionic bonds.
Sodium loss its one valence electron to iodine which is also having a valency of one. Hence one electron transfer from sodium to iodine make the compound sodium iodide with the formula NaI.
Magnesium is a divalent metal which needs to loss two electrons to attain stability and thus will binds to two other nonmetals each are provided with an electron. Therefore, the chemical formula of magnesium iodide is MgI₂.
To find more on ionic compounds, refer here:
https://brainly.com/question/9167977
#SPJ2
Which of the following gases will have the highest velocity at a given temperature? A) Ne B) O2 C) Ar D)N2
The velocity of any gas particles is inversely proportional to the molecular mass of the the gases. Lighter gases posses higher kinetic energy than heavier gases. From the list given, Neon is the lightest of the four gases with an atomic mass of 4.03 thus it is the lightest. Velocity contributes to the Kinetic energy of the particle. Thus A) Neon is the correct answer.
Answer: The correct answer is Option A.
Explanation:
Velocity of the gas is inversely related to the molar mass of the given gas. The equation representing the relation between the two is:
[tex]\text{Velocity of the gas}\propto \frac{1}{\sqrt{\text{Molar mass of the gas}}}[/tex]
From the above relation, if the molar mass of the gas is more, the velocity of the gas will be less and vice-versa.
The molar masses of the given gases are as:
Ne = 20 g/mol
[tex]O_2[/tex] = 32 g/mol
Ar = 40 g/mol
[tex]N_2[/tex] = 28 g/mol
As, the molar mass of neon is the lowest. Thus, it will have the highest velocity.
Hence, the correct answer is Option A.
An ion is created when __________ are added or removed. A. protons B. neutrons C. electrons D. protons and neutrons
C. electrons
An ion is formed when electrons are gained or lost.