Rates of Reaction

Question 1

What four things is the rate of reaction affected by?

Answer 1

Concentration of a solution(or pressure of a gas)
Surface area of solid
Temperature
Catalyst

Question 2

Why does the rate increase with higher concentration?

Answer 2

• There are more particles per unit volume
• So the collision frequency is higher
• So there are more successful collision per unit time

Question 3

Why does the rate increase with larger surface area?

Answer 3

• More of the solid is exposed to the other particles
• So the collision frequency is higher
• So there are more successful collision per unit time

Question 4

Why does rate increase with higher temperature?

Answer 4

• The particles have more kinetic energy
• So the percentage of collisions with energy greater than activation energy is higher
• So there are more successful collision per unit time

Question 5

Why does the rate increase with use of a catalyst?

Answer 5

• They provide an alternative route with a lower activation energy
• So the percentage of collisions with energy greater than activation energy is higher
• So there are more successful collision per unit time

Question 6

Name of a catalyst.

Answer 6

Manganese Oxide
MnO2

Question 7

How to calculate rate of reaction.

Answer 7

1000/time taken (s)

Question 8

How to calculate rate.

Answer 8

1/time taken (s)