The rate and extent of chemical change

Question 1

In what units is rate of reaction measured in?

Answer 1

g/s
mol/dm3
cm3/s

Question 2

In what ways can rate of reaction be found?

Answer 2

1. Measuring the amount of reactants used
2. Measuring the amount of products formed
3. Measuring the time it takes for a reaction mixture to become opaque or change colour

Question 3

The minimum amount of energy required to cause a reaction is called

Answer 3

Activation energy

Question 4

What factors affect the rate of reaction?

Answer 4

1. Temperature
2. Concentration
3. Surface area

Question 5

How do you measure the rate of reaction at a particular point?

Answer 5

1. Draw a tangent to the curve at that point
2. Find the gradient
3. The gradient=the rate of reaction at that point

Question 6

What is a catalyst?

Answer 6

A substance that increases the rate of reaction without being used up in the process.

Question 7

What does a catalyst do?

Answer 7

Reduces the activation energy for collisions by providing an alternative pathway for the reaction

Question 8

Why is increasing the rate of reaction important?

Answer 8

Helps to reduce costs in industry

Question 9

Definition of equilibrium

Answer 9

When the rate of the forward and backward reaction is equal.

Question 10

Le Chatelier’s principle

Answer 10

If a system in equilibrium is subjected to a change in conditions, then the system shifts to oppose the change.