SELF QUIZ

1. What effect will decreasing the temperature have on the rate of an endothermic reaction?

a. speed it up        c. reverse it

*b. slow it down    d. no effect

2. What effect will decreasing the temperature have on the rate of an exothermic reaction?

a. speed it up        c. reverse it

*b. slow it down    d. no effect

3. Calculate the value of the equilibrium constant for the following reaction if [A] = 2 M, [B] = 3 M, and [A₂B] = 4 M at equilibrium.

2 A + B Û A₂B

*a. 0.3      b. 0.8       c. 1.5     d. 3       e. 17

4. Calculate the concentration of B at equilibrium if K_eq = 0.012, [A] = 0.060 M, and [AB] = 0.20 M.

AB(g) Û A(g) + B(g)

a. 0.0036 M     *b. 0.040 M       c. 0.30 M      d. 3.3 M       e. 25 M

 

5. How much heat is released when .700 g of Mg is burned?

2 Mg + O₂ ® 2 MgO          DH = -144 kcal/mole Mg

a. 2.07 kcal

*b. 4.15 kcal

c. 8.30 kcal

d. 101 kcal

e. 202 kcal

6. What effect will a catalyst have on the rate of a reaction?

*a. increase      b. decrease       c. no effect

7. What effect will a catalyst have on the equilibrium of a reaction?

a. no effect because it has no effect on either the forward or reverse rate.

*b. no effect because it speeds up both the forward and reverse rate.

c. shift left because the reverse rate speeds up.

d. shift right because the forward rate speeds up.

e. shift right because the reverse reaction slows down.

8. For the following reaction, arrange the containers in order from slowest to fastest reaction rate.

AB(g) ® A(g) + B(g)

a. X<Y<Z      *b. X<Z<Y       c. Z<X<Y      d. Z<Y<X       e. Y<X<Z

9. For the following reaction, if N₂ is added, it will the forward reaction rate; and if the temperature is increased, it will the amount of NO₂ formed.

16 kcal + N₂(g) + 2 O₂(g) Û 2 NO₂(g)

*a. increase, increase

b. decrease, decrease

c. increase, decrease

d. decrease, increase

e. not change, not change

10. For the following equilibrium reaction, what effect will adding a catalyst have on the amounts of the chemicals?

16 kcal + N₂(g) + 2 O₂(g) Û 2 NO₂(g)

a. Increase the amount of NO₂ formed.

b. Increase the amount of N₂ and O₂ formed.

*c. Have no effect.