Rates Of Reaction

Question 1

What is the equation for the rate of reaction?

Answer 1

1/ Average time

Average time = Time 1 + Time 2 / 2

Rate = Change in a measured quantity / time taken

Question 2

Explain collision theory?

Answer 2

For a reaction to take place between reacting particles it must:

1. Have a successful collision
2. Have enough energy to react

Question 3

What is activation energy?

Answer 3

The minimum amount of energy needed to for a chemical reaction to occur.

Question 4

How does increasing the surface area affect the rate of reaction?

Answer 4

• More particles are exposed to the other reactants
• Meaning there are more successful collisions
• Increases the rate of reaction

Question 5

Diagram for measuring the rate of reaction

Answer 5

Look in book!

Question 6

What are the properties of carbon dioxide?

Answer 6

• odourless gas
• Colourless gas
• Heavier than air
• When cooled to -78 degrees it sublimes into dry ice
• It does not support combustion
• It is slightly soluble in water giving an acidic solution

Question 7

Explain the combustion of carbon when there are different supplies of oxygen?

Answer 7

Complete combustion - Plentiful supply
Carbon + Oxygen = Carbon dioxide

Incomplete combustion - Limited supply
Carbon + Oxygen = Carbon Monoxide

Question 8

Properties of carbon monoxide?

Answer 8

• Toxic
• Colourless
• Odourless gas

Question 9

What are some uses of carbon dioxide?

Answer 9

• Fire extinguishers - does not aid combustion
• Carbonated drinks - soluble in water and dissolved under high pressure
• Dry ice via sublimation

Question 10

Diagram for the preparation of carbon dioxide?

Answer 10

Look in book :]