Models For Reaction Rate

Question 1

Collision Theory

Answer 1

explains why different reactions
occur at different rates, and suggests ways to change
the rate of a reaction. It states that for a
chemical reaction to occur, the reacting particles must
collide with one another. The rate of the reaction
depends on the frequency of collisions. The theory also
tells us that reacting particles often collide without
reacting.

Question 2

Activation Energy

Answer 2

• The minimum energy necessary to
  form a product during a collision between reactants.

Question 3

Catalysis

Answer 3

is the process of increasing the rate of a
chemical reaction by adding a substance known as a
catalyst.

Question 4

Catalyst

Answer 4

speed up the rate of a chemical reaction by
providing an alternate route for the reaction to occur
with lower activation energy.

Question 5

Heterogeneous catalysis

Answer 5

– uses a catalyst that is of a
different phase from that of the reactants and products.

Question 6

Homogeneous catalysis

Answer 6

– the catalyst is of the same
phase as that of the reactants and products.

Question 7

For collisions to be successful, reacting
particles must

Answer 7

(1) collide (2) with sufficient energy, and
(3) with the proper orientation.