Which of the following forms a water solution that will conduct electricity?
F. CaCl2
G. CO2
H. NO2
J. SiF4

Answer:

Explanation:

[ H₃O⁺¹] = 4.8 x 10⁻¹¹ mol / l

H₃O⁺¹ = H₂O + H⁺

[ H₃O⁺¹] = [H⁺]

pH = -log[H⁺]

= -log[ 4.8 x 10⁻¹¹]

= -log 4.8 + 11

= - 0 .68 + 11

= 10.32

Answer:

Ionic Bond

Explanation:

Ionic Bonds are formed through electrostatic attraction between two ions that are opposite charge (also meaning a metal and a nonmetal).

Final answer:

Nonmetals like Cl combine with metals like Na through ionic bonding, where Na donates an electron to Cl, resulting in the formation of a stable compound, NaCl, with drastically different properties from the individual elements.

Explanation:

Nonmetals such as chlorine (Cl) combine with metals such as sodium (Na) primarily through the formation of ionic bonds. In this type of chemical bonding, the metal atom, sodium in this case, donates its valence electron to the nonmetal atom, chlorine, creating oppositely charged ions. Sodium becomes a positively charged cation (Na+), and chlorine becomes a negatively charged anion (Cl-). These oppositely charged ions are then attracted to each other due to electrostatic forces, forming a stable crystalline compound, sodium chloride (NaCl), commonly known as table salt. The process of these elements combining leads to a compound that has entirely different properties from its constituent elements. For example, while individual sodium atoms react explosively with water, and chlorine gas is extremely toxic, combined as sodium chloride, they form an essential compound for life that is stable and nonreactive in nature.

Answer:

See explanation and images attached

Explanation:

The equation for the laboratory preparation of nitrogen is:

NH4Cl(aq) + NaNO2(aq) → N2(g) + 2H2O(l) + NaCl (aq).

When concentrated sulphuric acid is used, the nitrogen gas is oxidized to ammonia

N2(g) + 3H2(g) -----> 2NH3(g)

2Na(s) + 2H2O(l) -----> 2NaOH(aq) + H2(g) NOTE HERE THAT THE SECOND PRODUCT IN THIS REACTION IS HYDROGEN GAS AND NOT WATER AS WRITTEN IN THE WORD EQUATION.

Molecular formula of calcium phosphate is Ca3(PO4)2

Molecular formula of sodium bicarbonate is NaHCO3

In the duplet state, the outermost shell of an atom contains only two electrons e.g helium.

Octet state means that the outermost shell of the atom contains eight electrons as in the noble gases Ne, Ar, Kr etc

The equation for the laboratory preparation of oxygen is ;

2KClO3(s)----> 2KCl(s) + 3O2(g)

Finally, if an element burns in air to give a soluble oxide which turns red litmus blue (basic property) then the element is a metal. Metals form basic oxides which dissolve in water to form alkaline solutions which turns red litmus paper blue.

Answer:

Image D...final answer

We can see here that the image that represents the Coulomb force between two negatively charged particles is D. Image D

The Coulomb force, also known as Coulomb's law or electrostatic force, is a fundamental concept in physics that describes the force between two charged objects. This force arises from the electric charge of particles and plays a crucial role in understanding the behavior of charged particles, such as electrons and protons. Coulomb's law states:

F = k × (|q₁ × q₂|) / r²

Where:

F is the electrostatic force between the two charges.

k is Coulomb's constant, approximately equal to 8.988 × 10^9 N m²/C².

q₁ and q₂ are the magnitudes of the charges.

r is the separation between the charges.

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Answer:

Each step in a mechanism will have a transition state. The transition states are often very difficult to identify and during a reaction the molecules exist in this state for essentially zero time. ... It is more of a theoretical idea for the configurations the chemical species must pass through during the reaction.

Explanation:

Answer:

The new air pressure is 21.76 psi

Explanation:

The caisson is a fixed volume structure hence we have pressure variation with temperature at constant volume which is explained by Gay Lussac's law which states that the pressure of a given mass of gas is directly proportional to its Kelvin temperature provided that the volume remain constant.

Therefore, P₁/T₁ = P₂/T₂

Where:

P₁ = Initial air pressure = 26.1 psi

T₁ = Initial air temperature  = 91 °F = 305.93 K

P₂ = New air pressure = Required

T₂ = New air temperature  = 95 °F = 308.15 K

Therefore, making P₂ the subject of the formula, we have;

P₂ = (P₁ × T₂)/T₁ = (26.1×308.15)/305.93 = 21.76 psi

The new air pressure = 21.76 psi.

Match these items are given below .

1) 0 °C                                          Freezing point of water

2) chemical property                   ability to react with another substance

3) Buoyancy                                upward force of a fluid on an object  

4) gas                                         molecules far apart

5) mass                                       amount of matter in object

6) solid                                        fixed shape

7) crystalline                                fixed internal order

8) frozen water                            expands

9) Amorphous                             no definite internal order

Thus,

1) 0 °C                                          Freezing point of water

2) chemical property                   ability to react with another substance

3) Buoyancy                                upward force of a fluid on an object  

4) gas                                          molecules far apart

5) mass                                       amount of matter in object

6) solid                                        fixed shape

7) crystalline                                fixed internal order

8) frozen water                            expands

9) Amorphous                             no definite internal order

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Items 1-9 are matched and described. The topic is the characteristics and properties of matter.

The matching items in this question are:

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Answer:

12

Explanation:

Balanced Chemical equation is

P4O10+ 6H2O —> 4 H3PO4

Therefore number of H atoms in the reactant side is 12

Answer:

0.5

Explanation:

We are given the moles of two reactants, so this could be a limiting reactant problem.

We know that we will need moles, so, lets assemble all the data in one place.

              2Ca₃(PO₄)₂ + 6SiO₂ + 10C → P₄ + 6CaSiO₃ + 10CO

n/mol:             1                 3

Calculate the moles of P₄ that can be formed from each reactant :

1. From Ca₃(PO₄)₂

[tex]\text{Moles of P}_{4} = \text{1 mol Ca$_{3}$(PO}_{4})_{2} \times \dfrac{\text{1 mol P}_{4}}{\text{2 mol Ca$_{3}$(PO}_{4})}_{2} = \text{0.5 mol P}_{4}[/tex]

2. From SiO₂

[tex]\text{Moles of P}_{4} = \text{3 mol SiO}_{2} \times \dfrac{\text{1 mol P}_{4}}{\text{6 mol SiO}_{2}} = \text{0.5 mol P}_{4}[/tex]

Each reactant forms 0.5 mol of P₄.

Answer:

1 mole of C2H6.

Explanation:

The balanced equation for the reaction is given below:

2C2H6 + 7O2 —> 4CO2 + 6H2O

We can determine the number of mole of C2H6 that reacted to produce 2 moles of CO2 as follow:

From the balanced equation above,

2 moles of C2H6 reacted to produce 4 moles of CO2.

Therefore, Xmol of C2H6 will react to produce 2 moles of CO2 i.e

Xmol of CO2 = (2 x 2)/4

Xmol of CO2 = 1 mole.

Therefore, 1 mole of C2H6 is required to produce 2 moles of CO2.

Answer:

DECREASE BY A FACTOR OF FOUR

Explanation:

Using pressure equation:

P 1 / T1 = P2 /T2     (at constant volume)

P1 = P

T1 =T

P2 = ?

T2 = 4 T

So therefore;

P2 = P1T1/ T2

P2 = P T/ 4 T

P2 = 1/4 P

The pressure is decreased by a factor of four, the new pressure is a quarter of the formal pressure of the gas.

Answer:

A on edg

Explanation:

Answer:

1. Ionic bond

2. High melting point and high boiling point for ionic bonds while covalent bonds have low melting and boiling point.

3. The similarity is that ionic and covalent bonding lead to the creation of stable molecules.

4. 4Fe + 3O2 → 2Fe2O3

5. It uses the process of fission.

6. Fission involves the splitting of radioactive elements into smaller particles/compounds while Fusion involves combining of two or more atomic nuclei to form one or more different atomic nuclei and subatomic particles.

7. Nuclear power plants produce little to no greenhouse gas.

Nuclear power plants produce a large amount of energy for a small mass of fuel.

Nuclear is less expensive.

Answer:

Endothermic

Explanation:

When barium hydroxide and ammonium chloride react, the temperature decreases because it's an endothermic reaction, where heat is absorbed, causing a cooling effect.

When barium hydroxide and ammonium chloride react, the temperature of the mixture decreases because the reaction is endothermic. An endothermic reaction is a type of chemical reaction that absorbs heat from its surroundings, resulting in a decrease in temperature. This is in contrast to exothermic reactions, which release heat, raising the temperature of the surroundings. In the case of barium hydroxide reacting with ammonium chloride, the cooling effect is so substantial that it can cause water to freeze, showcasing the highly endothermic nature of this reaction.

Endothermic reactions are characterized by their requirement for heat to proceed, thereby cooling the environment. This concept is essential in understanding thermochemistry, which involves the study of energy changes that occur during chemical reactions. The reaction between barium hydroxide and ammonium chloride serves as an example of how chemical reactions can absorb heat energy, leading to a temperature drop in the immediate environment.

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Answer:

Drawing attention to the ordinary and under-appreciated rural landscape, the fence inspired and provoked a different relationship with the land, emphasising an unrestrained imagination of possibility rather than the arbitrary nature of political and geographical boundaries, alluded to in its title.

Explanation:

Focusing on the ordinary underrated rural landscape, the fence stimulates and triggers different relationships with the land, not the arbitrariness of the political and geographical boundaries implied by its title, but of the possibilities. Emphasizing the concept of unlimited

The artwork is created for purposes such as conveying a social, political, or personal message. The meaning of artwork comes from a combination of viewer, artist, artwork, and context. The meaning of the artwork is enhanced by the emotions and the artist's ability to convey emotions.

Expression is the ability to communicate through art. Artistic expressions convey something about the children's "self", their likes, interests, emotions, personal experiences, and choices. Please provide the painting materials as soon as possible.

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Answer:

Coach is to football plays, as meteorologist is to: D. precipitation patterns.

A coach refers to an individual who is an expert or professional in the game of soccer and as such he or she manages a football team, while guiding the team members on how to play football. Thus, the activity of a coach is directly related to football plays against an opposition team.

On the other hand, a meteorologist refers to an individual who is an expert or professional in the field of meteorology and studies the weather in a region. This ultimately implies that, a meteorologist is saddled with the responsibility of studying the elements of weather in a particular geographic region and over a specific period of time.

Generally, some examples of the elements of weather are:

Deductively, we can conclude that a meteorologist studies precipitation patterns in a particular geographic region and over a specific period of time.

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Answer:

0.24 mm Hg

Explanation:

Answer:

A

Explanation:

Hundreds of stars

Answer:

The meaning of star system is group of hundreds of stars , that form around the same time .

Explanation:

Answer:

A. 50 to 200 years

Answer:

A. 50 to 200 years

Explanation:

Hope this helped! stay safe!

Answer:

Equation 3

Explanation:

It combines all the gas laws and it is called the ideal gas equation

Answer:

C.

Explanation:

Answer:

The final temperature of the water is 25.6 °C.

Explanation:

We have,

Heat added to water is 135.7 J

Mass, m = 54 g

Initial temperature was 25 °C

It is required to find the final temperature of the water. The heat added when temperature is increased is given in terms of specific heat capacity as :

[tex]Q=mc(T_f-T_i)[/tex]

[tex]T_f[/tex] is final temperature

c is specific heat capacity, for water, [tex]c=4.184\ J/g^{\circ} C[/tex]

So,

[tex]T_f=\dfrac{Q}{mc}+T_i\\\\T_f=\dfrac{135.7}{54\times 4.184}+25\\\\T_f=25.6^{\circ} C[/tex]

So, the final temperature of the water is 25.6 °C.

To find the final temperature of water after heat is added, the heat equation Q = m x c x ΔT is used. By dividing the amount of heat (135.7 J) by the product of water's mass (54.0 g) and its specific heat capacity (4.184 J/g°C), we find that the temperature increases by 0.60 °C. Thus, from an initial temperature of 25.0 °C, the water's final temperature is 25.6 °C.

To calculate the final temperature of water after a certain amount of heat is added, we use the formula
Q = m × c × t. Here Q represents the heat added in joules, m is the mass of the water in grams, c is the specific heat capacity of the water (which is 4.184 J/g°C), and ΔT is the change in temperature in degrees Celsius. For a given amount of water at an initial temperature, the added heat will increase the water's temperature by a certain amount based on this formula.

In this case, 135.7 J of heat are added to 54.0 g of water initially at 25.0 °C. The specific heat capacity of water (c) is a well-known constant, 4.184 J/g°C. The change in temperature (ΔT) can be calculated as follows:

ΔT = Q / (m × c)

ΔT = 135.7 J / (54.0 g times4.184 J/g°C)

ΔT = 135.7 J / (225.936 J/°C)

ΔT = 0.60 °C

The final temperature of the water is the initial temperature plus the increase in temperature:

T(final) = T(initial) +ΔT

T(final) = 25.0 °C + 0.60 °C

T(final) = 25.6 °C

Answer: 3 moles

Explanation:

Using the ideal gas equation; PV = nRT

P= Pressure= 2.1 Atm  V= Volume = 3.5L  T= Temperature = 315K

n= no of moles

R= Gas constant = 0.08206 L .atm. mol-1 . K-1

Making 'n' the subject of the formular, we then have;

n = PV / RT

   = 2.1 Atm x 3.5L /  0.08206 L .atm. mol-1 . K-1 x 315K

   =  7.35 / 25.849

   =  0.28  approx  3moles

Answer:

O2(g) was Reduced

Explanation:

It is necessary at this point to restate the working definitions of oxidation and reduction.

Oxidation refers to increase in oxidation number. A chemical specie is oxidized in a chemical reaction if there is a positive increase in its oxidation number from left to right in the reaction.

A chemical specie is said to be reduced when there is a decrease in its oxidation number from left to right in a reaction. Hence reduction refers to a decrease in oxidation number.

Now let us focus on O2(g). Its oxidation number on the left hand side is zero. On the right hand side, its oxidation number decreases to -2. This shows a decrease in oxidation number. From our premises above, we can safely conclude that O2(g) was reduced in the reaction.

The answer to whether the Oxygen (O₂) is oxidized or reduced is that;

The oxygen (O₂) is being reduced.

We are given the equation;

C₂H₅OH (l) + 3O₂ (g) → 2CO₂ (g) + 3H₂O (g) ΔH° = –1270 kJ/mol_rxn

Now, Oxidation in this context will be an increase in oxidation number. This means that we consider a chemical element in a chemical reaction to be undergoing oxidation if there is a positive increase in its oxidation number from left to right in the reaction. Otherwise, it is said to undergo reduction.

Now, when we assign oxidation numbers to the elements in the chemical equation, the oxygens in O₂ (g) would be zero. Meanwhile the oxygens in both CO₂ (g) and H₂O (g) are -2.

In conclusion, since the oxygens in both CO₂ (g) and H₂O (g) are -2, it means oxidation number has reduced and as such there is a reduction in oxygen.

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Answer:

40 mL

Explanation:

V2=P1V1/P2

You can check this by knowing that P and V at constant T have an inverse relationship. Hence, this is correct.

The new volume will be "40 mL".

A gas equation or principle essentially asserts that perhaps the pressure generated by something like a gaseous molecule (with a particular mass as well as constant temperatures) seems to be inversely proportional towards its volume.

According to the question,

Pressure, P₁ = 760.0 mm

                P₂ = 850.0 mm

Volume, V₁ = 45.0 mL

              V₂ = ?

By using Boyle's Law,

→ P₁V₁ = P₂V₂

or,

New volume will be:

V₂ = [tex]\frac{P_1 V_1}{P_2}[/tex]

By substituting the values,

    = [tex]\frac{760\times 45}{850}[/tex]

    = [tex]\frac{34200}{850}[/tex]

    = 40 mL

Thus the response above is correct.

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Answer:

ALL ISOTOPES OF AN ELEMENT HAVE THE SAME NUMBER OF;

1. PROTON

2. ATOMIC NUMBER

Explanation:

Isotopes are atoms with the same atomic number but different mass numbers. Isotopes of an element has the same number of proton which dictates the atomic number of the atoms. The difference in mass number is as a result of the difference in the number of neutrons. Isotopes of an atom have different physical properties but they exhibits the same chemical properties because neutrons have no influence on the chemical properties and the change or difference in neutrons will produce no effect on the chemical properties of the atoms. Neutrons only contributes to the mass of the atoms giving the isotopes of an atom different mass numbers. An example is chlorine with two isotopes, Cl -35 and Cl -37.

Properties                            Cl-35                                                    Cl-37

mass number                        35                                                        37

atomic number                      17                                                         17

number of protons                17                                                          17

number of electrons                17                                                       17

number of neutrons        35-17 = 18                                             37-17 = 20

abundance in nature             75%                                                    25%

From the given information;

An isotope is are two or more atomic element that contains the same equal number of protons in the nucleus of an atom but with a different number of neutrons.

They share the same similar chemical properties and they behave in the same manner in the chemical reaction but have different mass numbers due to the different number of neutrons.

The difference in their mass numbers influences the rate of their chemical reactions.

They also exhibit different stability. While some are stable, some are unstable, and they can be referred to as radioactive isotopes.

Therefore, we can conclude that:

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The mass of water should be 180g.

[tex]no\ of\ mole\ of\ H2 = mass\div RAM[/tex]

[tex]=20\div 2(2)[/tex]

=5mol

And, the mass of water should be

[tex]=5mol\times 2(2+16)mol/g[/tex]

=180g

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Answer: The pressure that the [tex]H_2(g)[/tex] produced in the reaction would have if it were dry will be 728 torr

Explanation:

According to Dalton's law, the total pressure is the sum of individual pressures.

[tex]p_{total}=p_{H_2}+p_{H_2O}[/tex]

Given : [tex]p_{total}[/tex]  =total pressure of gas = 749 torr

[tex]p_{H_2}[/tex] = partial pressure of hydrogen = ?

[tex]p_{H_2O}[/tex] = partial pressure of water = 21 torr

putting in the values we get:

[tex]749=p_{H_2}+21[/tex]

[tex]p_{H_2}=728torr[/tex]

Thus the pressure that the [tex]H_2(g)[/tex] produced in the reaction would have if it were dry will be 728 torr

To calculate the dry pressure of the hydrogen gas, subtract the equilibrium vapor pressure of H2O at 23.0°C from the total pressure in the tube: 749 torr - 21 torr = 728 torr. Therefore, the pressure of the H2(g) would be 728 torr if it were dry.

The pressure of hydrogen gas produced in the reaction is determined by taking the total pressure in the collection tube and subtracting the equilibrium vapor pressure of water at the same temperature. In this case, the total pressure is 749 torr, and the equilibrium vapor pressure of water is 21 torr at 23.0°C.

To calculate the dry pressure of the hydrogen gas, you would perform this calculation: Dry H2(g) pressure = total pressure - vapor pressure of water = 749 torr - 21 torr = 728 torr.

This tells us if the hydrogen gas were dry, its pressure would be 728 torr. This involves concepts related to gas laws, vapor pressure, and reactions producing gas in chemistry.

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Answer:

1) Nitrogen

2) Methane

3) Dipeptide

4) Ammonia

5) Glycine

In Polish/Po polsku

1) Azot

2) metan

3) dipeptyd

4) Amoniak

5) glicyna

Explanation:

English Translation

Solve logogriffs. Read the password from the highlighted fields and write it down.

1.The chemical element being the main component of air (it occupies 78% of its volume),

2. The simplest saturated hydrocarbon,

3. Is a result of combining two amino acid molecules,

4. Gas with a pungent odor, soluble in water; hydrogen and nitrogen synthesis product.

5. Common name of aminoacetic acid

(the first has four boxes, the second has five boxes, the third has eight quarters has seven, fifths and seven).

Thank you in advance

1) The main component of air that makes up 78% of the air is Nitrogen.

2) The simplest saturated hydrocarbon is the first member of the alkane family, Methane.

3) Two amino acids combine by forming peptide bonds between the carboxyl group of one amino acid and the amino group of another through dehydration synthesis (loss of 1 molecule of water). Hence, the result of the combination of two amino acids are called Dipeptides.

4) Nitrogen and Hydrogen come together to form only one known water soluble gas with pungent smell, called Ammonia.

5) Aminoacetic acid as its name suggests is an amino acid with the acetyl group. It is the simplest amino acid. The common name for this compound is Glycine.

In Polish/Po polsku

1) Głównym składnikiem powietrza, które stanowi 78% powietrza, jest azot.

2) Najprostszym nasyconym węglowodorem jest pierwszy członek rodziny alkanów, metan.

3) Dwa aminokwasy łączą się, tworząc wiązania peptydowe między grupą karboksylową jednego aminokwasu i grupą aminową innego przez syntezę odwodnienia (utrata 1 cząsteczki wody). Stąd wynik połączenia dwóch aminokwasów nazywa się dipeptydami.

4) Azot i wodór tworzą razem jeden znany gaz rozpuszczalny w wodzie o ostrym zapachu, zwany amoniakiem.

5) Kwas aminooctowy, jak sama nazwa wskazuje, jest aminokwasem z grupą acetylową. To najprostszy aminokwas. Powszechna nazwa tego związku to glicyna.

Hope this Helps!!!

Mam nadzieję że to pomoże!!!