Chemistry energy

Question 1

Can energy be created or destroyed?

Answer 1

No, it is eternal

Question 2

What is condensation?

Answer 2

When water vapour cools back to the liquid state

Question 3

What is evaporation?

Answer 3

Water once it has boiled and is in it’s gaseous form.

Question 4

When does something have the energy store ‘gravitational potential’?

Answer 4

When it is a substantial amount above the earth’s surface

Question 5

Name 4 non-renewable energy types

Answer 5

Nuclear, coal, oil, natural gas

Question 6

Name an example of the renewable energy source fuelled by water

Answer 6

Tidal

Question 7

Name an example of the renewable energy source fuelled by the sun’s light

Answer 7

Solar

Question 8

Name an example of the renewable energy source fuelled by the wind

Answer 8

Wind turbines

Question 9

Name the renewable energy source fuelled by volcanoes

Answer 9

Geothermal

Question 10

Give an example of the renewable energy source. ‘Biomass’

Answer 10

Pulp/paper mills

Question 11

Define efficiency

Answer 11

A way that uses the least amount of energy

Question 12

The total energy stored before = ?

Answer 12

The total energy stored after

Question 13

Name the 5 types of energy stores

Answer 13

Kinetic, gravitational potential, thermal, elastic potential, chemical.

Question 14

How can you calculate efficiency?

Answer 14

Total energy out / total useful energy

Question 15

Why are metals good conductors?

Answer 15

They have free moving electrons.

Question 16

How is conduction in solids caused?

Answer 16

By vibrations passing from one atom to another.

Question 17

What is heat measured in?

Answer 17

Joules ( J )

Question 18

What is temperature measured in?

Answer 18

Degrees celsius ( c )

Question 19

True or false? Convection in a liquid begins with conduction through its container

Answer 19

True

Question 20

True or false? Convection in gases occur when the gas expands, becomes more dense and rises.

Answer 20

False. It expands, becomes LESS dense and rises, allowing it to rise in the first place above the more dense air around it.

Question 21

Which energy store does an objects energy move to when it is dropped from a great height

Answer 21

It moves from gravitational potential to kinetic

Question 22

Which energy store is in a battery?

Answer 22

Chemical

Question 23

Which energy store does a hot water bottles energy go into?

Answer 23

Trick question: it goes from its thermal store to yours

Question 24

How does a battery in a smartphone conserve energy?

Answer 24

It transfers chemical energy to infra red light waves and internal energy.