5.5-5.6 Collision Model and Reaction Energy Profiles

Multiple Choice

What is collision theory?

• Molecules must collide in the correct orientation with enough energy to bond.

• Molecules need enough energy to collide and react.

• Atoms constantly collide and react.

• The minimum energy needed for atoms to react

Multiple Choice

Which of the following statements are associated with fast reaction rates?

I. Reactant molecules with weak bonds

II. High activation energy

III. A high percentage of collision orientations that can produce a reaction

• II only

• I and II only

• I and III only

• I, II, and III

Multiple Choice

Which has more surface area?

• Large chunks of chalk

• Cube of sugar

• Powdered sugar

• Small chunks of sugar

Multiple Choice

If you shrink the container size that your gas substance is in what will happen?

• The reaction rate will stay the same

• The reaction rate will speed up

• The reaction rate will slow down

Multiple Choice

Which of the following best helps explain why an increase in temperature increases the rate of a chemical reaction?

• At higher temperatures, reactions have a lower activation energy

• At higher temperatures, reactions have a higher activation energy

• At higher temperatures, every collision results in the formation of product

• At higher temperatures, high energy collisions happen more frequently

Multiple Choice

The reaction in the picture occurs in a single step that involveds the collision between a particle of NO and NO₃. A scientist correctly calculates the rate of collisions between the two molecules that have sufficient energy to overcome the activation energy. The observed reaction is only a small fraction of the collision rate. Which best explains why?

• The energy of collisions between two reactant particles is frequently absorbed by collision with a third particle

• The two reactant particles must collide with a particular orientation to react

• The activation energy for a reaction is dependent on the concentration of the reactant particles

• The activation energy for a reaction is dependent on the temperature

Multiple Choice

what is the WRONG statement regarding the following energy profile?

• Energy is given out during the reaction.

• The products are at a lower energy level than the reactants.

• The reaction is endothermic.

• D The temperature increases during the reaction.

Multiple Choice

For all reactions, which letter represents the REACTANTS?

• A

• B

• C

• D

Multiple Choice

Endothermic reactions...

• Absorb heat

• Release heat

• Lose heat

• Give off heat

Multiple Choice

For each reaction, which letter represents the PRODUCTS

• A

• B

• C

• D