The rate of a chemical reaction is the amount of reactant that changes to product in a specific amount of time. True False 2.

1. The rate of a chemical reaction is the amount of reactant that changes to product in a specific amount of time.

True

False

2. Collisions between reactant molecules does not always lead to the formation of product molecules.

True

False

3. The rate of a reaction increases with increasing concentrations of reactants because you have more collisions occurring in a given time period.

True

False

4. Which of the following changes will increase the reaction rate?

increase the temperature

increase the concentration of the reactants

increase the energy of the collisions

decrease the number of low energy collisions

all of the above

5. A catalyst is

a substance that decreases the energy of the products.

a substance that increases the energy of the products.

a product in a chemical reaction.

a reactant in a chemical reaction.

a substance that speeds up a reaction without being consumed in the reaction.

6. A reaction that can proceed in either the forward or the reverse direction as written is called a __________ reaction.

favored

reversible

microscopic

miniscule

solid phase

7. Equilibrium occurs when the rate of the forward reaction equals the rate of the reverse reaction.

True

False

8. What is the correct form for the equilibrium constant expression for this reaction?

H2(g) + F2(g)  2 HF(g) Keq = _______________

9. The equilibrium expression for the reaction: 

True

False

10. For the reaction   , the equilibrium constant is:

2.3

0.15

0.44

6.7

none of the above

11. Le Chatelier's principle states that when a chemical system at equilibrium is disturbed, the system shifts in a direction that minimizes the disturbance.

True

False

12. Decreasing the amount of carbon dioxide in the reaction below will cause the reaction to proceed to the right so that equilibrium will be restored. 

True

False

13. Adding heat to an exothermic reaction will cause the reaction to remain unchanged.

True

False

14. For the following equilibrium reaction, which cause and effect are correctly matched?

CO(g) + 2H2(g)  CH3OH(g) + heat

remove CH3OH, shift left

add heat, shift right

remove heat, no change

remove H2, shift left

add CO, shift left