Chemistry Ch18&19 Exam

79 Questions | By Bakerph1 | Updated: Mar 21, 2022 | Attempts: 269

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Questions and Answers

1.

The law of chemical equilibrium states that at a given pressure, a chemical system may reach a state in which a particular ratio of reactant to product concentrations has a constant value.
- A.
  
  True
- B.
  
  False
2.
- A.
  
  True
- B.
  
  False
3.

If an equilibrium constant has a value less than one, the reactants are favored at equilibrium.
- A.
  
  True
- B.
  
  False
4.

The value for K_eq is constant only at a specific volume.
- A.
  
  True
- B.
  
  False
5.

In an exothermic reaction, an increase in temperature favors the formation of products
- A.
  
  True
- B.
  
  False
6.
- A.
  
  True
- B.
  
  False
7.
- A.
  
  True
- B.
  
  False
8.

A heterogeneous equilibrium means that reactants and products are present in more than one state.
- A.
  
  True
- B.
  
  False
9.

If the equilibrium constant for a reaction at 300 K is 49.7, the concentration of the reactants will be greater than the concentration of the products.
- A.
  
  True
- B.
  
  False
10.
- A.
  
  0.16 mol/L
- B.
  
  0.0014 mol/L
- C.
  
  0.075 mol/L
- D.
  
  0.75 mol/L
11.
- A.
  
  8.9 x 10^-3 mol/L
- B.
  
  2.0 x 10^-2 mol/L
- C.
  
  2.0 x 10^-3 mol/L
- D.
  
  7.4 x 10^-3 mol/L
12.

The solubility product expression describes the equilibrium between a sparingly soluble ionic compound
- A.
  
  The amount of substance added to solution.
- B.
  
  The number of moles in the reaction.
- C.
  
  Its ions in solution.
- D.
  
  The equilibrium constant.
13.
- A.
  
  The equilibrium shifts to the left.
- B.
  
  The equilibrium shifts to the right.
- C.
  
  The equilibrium does not change.
- D.
  
  The equilibrium constant changes.
14.
- A.
  
  Le Châtelier’s principle
- B.
  
  Common ion effect
- C.
  
  Solubility product constant
- D.
  
  Law of chemical equilibrium
15.

What is indicated by a large value for K_eq?
- A.
  
  A solution is saturated.
- B.
  
  Products are favored in the reaction.
- C.
  
  Reactants are favored in the reaction.
- D.
  
  The reaction is endothermic.
16.

The value of any equilibrium constant is correct only at
- A.
  
  A specific volume.
- B.
  
  A specific pressure.
- C.
  
  A specific concentration.
- D.
  
  A specific temperature.
17.
- A.
- B.
- C.
- D.
18.
- A.
  
  The temperature of the system increases.
- B.
  
  The temperature of the system decreases.
- C.
  
  More chlorine is produced.
- D.
  
  The temperature remains unaffected.
19.

According to Le Chatelier’s principle, when the volume is increased, the equilibrium shifts to the right. For which of the following reversible reactions is this true?
- A.
- B.
- C.
- D.
20.
- A.
  
  Decrease in the volume of N₂.
- B.
  
  Increase in the amount of catalyst.
- C.
  
  Decrease in pressure.
- D.
  
  Decrease in temperature.
21.

What might cause the solubility of a substance to decrease?
- A.
  
  A decrease in temperature
- B.
  
  A decrease in pressure
- C.
  
  The presence of a common ion
- D.
  
  All of the choices
22.

What can be determined if the ion product is compared to the solubility product constant?
- A.
  
  Equilibrium
- B.
  
  whether a substance will precipitate
- C.
  
  The law of mass action
- D.
  
  The volume of the solution
23.

When a reaction results in almost complete conversion of reactants to products, chemists say the reaction goes to ____________________.
- A.
  
  Completion
- B.
  
  Reversible reaction
- C.
  
  Chemical equilibrium
- D.
  
  Constant, equal
- E.
24.

The solubility product of aluminum sulfate Al₂(SO₄)₃ is given by the expression ____________________.
- A.
  
  Completion
- B.
  
  Reversible reaction
- C.
  
  Chemical equilibrium
- D.
  
  Constant, equal
- E.
25.

At equilibrium, the concentrations of reactants and products are ____________________, but that does not mean that the amounts or concentrations are ____________________.
- A.
  
  Completion
- B.
  
  Reversible reaction
- C.
  
  Chemical equilibrium
- D.
  
  Constant, equal
- E.