5.5-5.6 Collision Model and Reaction Energy Profiles

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

II only

I and II only

I and III only

I, II, and III

Large chunks of chalk

Cube of sugar

Powdered sugar

Small chunks of sugar

The reaction rate will stay the same

The reaction rate will speed up

The reaction rate will slow down

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

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

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.

A

B

C

D

Absorb heat

Release heat

Lose heat

Give off heat

A

B

C

D