Reactions

Question 0

How do you produce energy using a simple cell?

Answer 0

2 electrodes and an electrolyte generate electricity.

Question 1

Why is a reaction exothermic?

Relate to bonds

Answer 1

The energy needed for bond breaking is less than the energy released in bond making.

Question 2

How do you produce energy using a hydrogen fuel cell?

Answer 2

Hydrogen is a potential fuel that reacts with oxygen to generate electricity in a fuel cell.

Question 3

List 4 methods to produce energy.

Answer 3

1. Radioactive isotopes
2. Combustion of fuels
3. Hydrogen fuel cells
4. Simple cells

Question 4

Why is a reaction endothermic?

Answer 4

The energy released in bond making is less than the energy needed for bond breaking.

Question 5

Define exothermic reactions.

Answer 5

Reactions where energy is given out of the surroundings because the products contain less overall energy than reactants.

Question 6

Does bond breaking release/require energy?

Answer 6

Require

Question 7

Define endothermic reactions.

Answer 7

Reactions where energy os taken in from the surroundings because the products contain more overall energy than the reactants.

Question 8

How do you produce energy using radioactive isotopes?

Answer 8

Bombard uranium-235 with neutrons which splits the atom into smaller atoms, more neutrons and lots of energy.

Question 9

Does bond making release/require energy?

Answer 9

Release