Chemistry Ch18&19 Exam
- 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.
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- 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 Keq 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.
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- A.
True
- B.
False
- 7.
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- 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.
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- A.
0.16 mol/L
- B.
0.0014 mol/L
- C.
0.075 mol/L
- D.
0.75 mol/L
- 11.
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- 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.
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- 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.
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- 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 Keq?
- 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.
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- A.
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- B.
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- C.
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- D.
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- 18.
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- 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.
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- B.
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- C.
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- D.
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- 20.
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- 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.
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- 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.
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- 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.
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Questions: 10 | Attempts: 48853 | Last updated: Aug 26, 2021
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