Question 1

Which of the following is NOT one of the three conditions required for a successful collision leading to a chemical reaction?

Accepted Answer

The reactants must be in the same physical state.

Question 2

Which change will increase the rate of the following reaction? $$2SO_2(g) + O_2$(g) \rightarrow 2SO_3(g)$$

Accepted Answer

Adding a catalyst

Question 3

For the reaction $$COCl_2(g$$) \rightleftharpoons CO(g) + $$Cl_2(g$$)$$ with K_c = 0.68$, if $$[CO] = 0.40\,M$$ and $$[$$Cl_2$$] = 0.74\,M$$, what is the equilibrium concentration of $$COCl_2$$?

Accepted Answer

$$0.44\,M$$

Question 4

Which of the following will shift the equilibrium of $$CO(g) + H_2O(g) \rightleftharpoons CO_2$(g) + H_2$(g) + heat to $$the left, decreasing $$CO_2$$ production?

Accepted Answer

Increasing the temperature

Question 5

A reaction is at equilibrium. What happens to the rates of the forward and reverse reactions?

Accepted Answer

They are the same

Question 6

Calculate the value of $$K_c$$ for the reaction $$N_2(g) + 3H_2(g$$) \rightleftharpoons 2NH_3(g)$$ if the equilibrium mixture contains 0.44$$\,M$$ N_2$, 0.40$$\,M$$ H_2$, and 2.2$$\,M$$ NH_3$.

Accepted Answer

$$9.4$$

Question 7

Which of the following will NOT increase the rate of a chemical reaction?

Accepted Answer

Decreasing the surface area of a solid reactant

Question 8

For the reaction $$CO_2(g$$) + $$H_2(g$$) \rightleftharpoons CO(g) + H_2O(g)$$, calculate K_c$ if the equilibrium mixture contains 0.30$$\,M$$ CO_2$, 0.033$$\,M$$ H_2$, 0.20$$\,M$$ CO$, and 0.30$$\,M$$ H_2O$.

Accepted Answer

$$6.1$$

Question 9

Which of the following best describes the effect of a catalyst on a chemical reaction?

Accepted Answer

It decreases the activation energy

Question 10

A sample of methane ($$CH_4) $$has a volume of $$25\,mL$$ and a pressure of $$0.80\,atm. $$What is the final volume (in mL) if the pressure is changed to $$0.47\,atm (at $$constant temperature)?

Accepted Answer

$$42.8\,mL$$

Question 11

Which of the following changes will produce more product for the reaction $$O_2(g) + 2HF(g) + 76$$kcal \rightleftharpoons $$OF_2(g) + H_2O(g$$)$$?

Accepted Answer

Increase temperature, add $$O_2$$, add $$HF$$

Question 12

Which of the following is the correct equilibrium expression for the reaction $$CH_4(g) + H_2S(g$$) \rightleftharpoons $$CS_2(g$$) + $$H_2(g$$)$$?

Accepted Answer

$$K_c = \frac{[CS_2$][H_2$]}{[CH_4$][H_2S]}$$

Question 13

A gas has a volume of $$4.00\,L at$$ $$0^\circ C. $$What final temperature (in Celsius) is needed to change the volume to $$20.0\,L (at $$constant pressure)?

Accepted Answer

$$1374^\circ C$$

Question 14

Which of the following will cause the equilibrium to shift to produce more reactant in the reaction $$N_2(g) + 3H_2(g$$) \rightleftharpoons 2NH_3(g) + heat$$?

Accepted Answer

Increasing the temperature

Question 15

Which of the following is a correct statement about equilibrium?

Accepted Answer

At equilibrium, the rates of the forward and reverse reactions are equal.

Question 16

If the equilibrium constant $$K_c$$ for a reaction is much greater than 1, what does this indicate about the equilibrium mixture?

Accepted Answer

It contains mostly products.

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