Factors Which Affect The Rates Of Chemical Reactions

Question 1

What are the four factors that affect the rate of reaction ?CCST

Answer 1

Concentration
Catalyst
Surface area
Temperature

Question 2

How does concentration affect the rate of reaction ?

Answer 2

More particles per (unit volume) meaning there are more successful collisions per (unit time)

Question 3

How does temperature affect the rate of reaction ?

Answer 3

Particles have more kinetic energy therefore there are more successful collisions per (unit time)

Question 4

How does surface area affect the rate of reaction?

Answer 4

Surface area: volume ratio increases there are more successful collisions per (unit time)

Question 5

How do catalysts affect the rate of reaction ?

Answer 5

Speeds up a reaction without being used up itself
- catalyst porgies an alternative pathway meaning more successful collisions per unit time

Question 6

Describe the role of a catalyst ?

Answer 6

• not used up in reaction
• produces an alternate pathway- less activation energy
• Enzymes- biological callers