14-1

Question 1

Factors that Affect Reaction Rates​

Answer 1

Physical state of the reactants​

Reactant concentrations​

Reaction temperature​

Presence of a catalyst

Question 2

Homogeneous reactions are

Answer 2

Reactants are in one phase (gases or liquids) ​

Homogeneous reactions are in general faster.​

Question 3

Heterogeneous reactions that involve solids​

Answer 3

In general, these reactions are slower​

When surface area of the solid reactant is increased, the reaction proceeds faster​

Question 4

In order to react, the reactants…

Answer 4

must collide.​
The more rapidly the reactants collide, the more rapidly they react.​

Question 5

As the reactant concentration increases the reaction rate…and why?

Answer 5

will also increase
When the concentration increases, the number of collisions increases.​

Question 6

As temperature increases, reaction rate… and why?

Answer 6

Increases
As the temperature increases, kinetic energy of molecules increases, so the molecules move more quickly​.
As the molecules move more quickly, the number of collisions​ increases
and the energy that the molecules possess during the collisions ​increases

Question 7

The catalysts are added to..

Answer 7

increase the reaction rates​
Catalysts affect the pathway from reactants to products​
Catalysts are critical in many biological reactions.​

Question 8

The slope of the tangent of the curve at one point in time gives…

Answer 8

the instantaneous rate.​

Question 9

The instantaneous rate at time zero is…

Answer 9

the initial rate

Question 10

What happens to the rate over time

Answer 10

As time goes by, the reaction rate decreases

Question 11

as time goes by, the concentrations of reactants…

Answer 11

Decreases