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 gaseous state.

Question 2

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

Accepted Answer

Adding a catalyst

Question 3

For the reaction $$CO(g) + H_2O(g) ightleftharpoons CO_2$(g) + H_2$(g) + 	ext{heat}$$, which of the following will decrease the production of $$CO_2$$?

Accepted Answer

Removing $$H_2O$$

Question 4

Given the equilibrium $$N_2(g) + 3H_2(g$$) \rightleftharpoons 2NH_3(g)$$, what is the value of K_c$ if at equilibrium $$[$$N_2$$] = 0.44\,M$$, $$[$$H_2$$] = 0.40\,M$$, and $$[$$NH_3$$] = 2.2\,M$$?

Accepted Answer

$$K_c = \dfrac{[NH_3$]^2}{[N_2$][H_2$]^3} = 9.4$$

Question 5

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

Accepted Answer

Color of the reactants

Question 6

At equilibrium, the rates of the forward and reverse reactions:

Accepted Answer

Are the same

Question 7

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$$, what is $$[$$COCl_2$$]$$ at equilibrium?

Accepted Answer

$$[$$COCl_2$$] = 0.43\,M$$

Question 8

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

Accepted Answer

It decreases the activation energy.

Question 9

For the reaction $$CO_2(g$$) + $$H_2(g$$) \rightleftharpoons CO(g) + H_2O(g)$$, if the equilibrium mixture contains $$[$$CO_2$$] = 0.30\,M$$, $$[$$H_2$$] = 0.033\,M$$, $$[CO] = 0.20\,M$$, and $$[H_2O] = 0.30\,M$$, what is the value of K_c$?

Accepted Answer

$$K_c = \dfrac{[CO][H_2O]}{[CO_2$][H_2$]} = 6.1$$

Question 10

Which of the following changes will shift the equilibrium $$N_2(g) + 3H_2(g$$) ightleftharpoons 2NH_3(g) + 	ext{heat}$$ to the right (toward more NH_3$)?

Accepted Answer

Removing $$NH_3$$

Question 11

A reaction is endothermic. Which of the following will increase the rate of the reaction?

Accepted Answer

Adding a catalyst

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

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

Question 13

Which of the following will cause the equilibrium $$2NO_2(g) \rightleftharpoons N_2O_4(g) to $$shift to the right?

Accepted Answer

Adding more $$NO_2$$

Question 14

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 $$0.47\,atm ($$assume constant temperature)?

Accepted Answer

$$42.8\,mL$$

Question 15

Which of the following is a correct way to increase the production of $$OF_2 in $$the reaction $$O_2(g) + 2HF(g) + 76$$\,kcal \rightleftharpoons $$OF_2(g) + H_2O(g$$)$$?

Accepted Answer

Increase the temperature

Question 16

A tank of gas has a pressure of $$845\,mmHg. $$What is the pressure in $$atm$$?

Accepted Answer

$$1.11\,atm$$

Question 17

Which of the following acids is classified as a strong acid?

Accepted Answer

HCl

Question 18

If $$29.1\,mL of$$ $$0.353\,M$$ $$NaOH is $$required to titrate $$25.0\,mL of a $$solution of $$H_2SO_4$$, what is the molarity of the sulfuric acid?

Accepted Answer

$$0.205\,M$$

Question 19

Which of the following is the correct balanced equation for the titration of acetic acid with potassium hydroxide?

Accepted Answer

$$HC_2H_3O_2(aq) + KOH(aq) \rightarrow KC_2H_3O_2(aq) + H_2O(l)$$

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