Topic 5-C7

Question 1

Define an exothermic reaction

Answer 1

A reaction which gives out more energy to the surroundings than it takes in

Question 2

Define an endothermic reaction

Answer 2

An endothermic reaction is a reaction that takes in more energy from the surroundings than it gives out

Question 3

Name two exothermic reactions

Answer 3

Any of
Neutralisation
Combustion
Oxidation

Question 4

What is thermal decomposition

Answer 4

When you heat a product and it into decomposes into two reactants

Question 5

What is activation energy

Answer 5

The energy needed to begin a reaction

Question 6

Bond breaking is a ___________ process

Answer 6

Endothermic

Question 7

Bond forming is a __________ process

Answer 7

Exothermic

Question 8

What is a cell?

Answer 8

A cell is a system made up of two electrodes in contact with an electrolyte

Question 9

What are the neseccary conditions in a cell

Answer 9

The electrodes must conduct electricity(usually metals)

The electrolyte must contain ions which react with the electrodes

Question 10

Describe a fuel cell

Answer 10

A fuel cell is a cell that uses a fuel (e.g. hydrogen) and oxygen to create a reaction and harnesses the energy released to produce electrical energy