4.3 Factors affecting reactions rates

Question 1

Catalysts:

Answer 1

are substances that help a reaction to proceed faster. they are present with the reactants of the reaction, but they are not consumed during the reaction.

Question 2

Chemical Reactions involving catalysts can be found in

Answer 2

both living and nonliving things

Question 3

The four factors that can affect the rate of chemical reactions are

Answer 3

1. The presence of a catalyst. 2. The concentration of the reactants 3. The tempature of the reactants
2. The surface area of the reactants.

Question 4

What does concentration mean in regards to a chemical reaction

Answer 4

The greater the concentration of the reactants the faster the reaction

Question 5

What does surface are mean in regards to the chemical reaction

Answer 5

• Increasing the surface area of the reactants will also increase the rate of a reaction
• You can do this by breaking up reactants into smaller pieces

Question 6

What does Tempature mean in regards to a chemical reaction

Answer 6

• The more heat added to a reaction the faster it will occur

- makes atoms move faster