Hertswood Academy Gcse Physics P1 1 Energy Transfer By Heating

Front 1

What type of energy do all objects emit? (1 mark)

Back 1

Infrared Radiation

Front 2

What factor would affect the amount of infrared radiation emitted from the object? (1 mark)

Back 2

The temperature of the object

Front 3

What types of surfaces are good emitters and good absorbers of infrared radiation? (1 mark)

Back 3

Dark, matt surfaces

Front 4

What types of surfaces are poor emitters and poor absorbers of infrared radiation? (1 mark)

Back 4

Light, shiny surfaces

Front 5

What types of surfaces are good reflectors of infrared radiation? (1 mark)

Back 5

Light, shiny surfaces

Front 6

How are particles arranged in a solid? (6 marks)

Back 6

Close together

No room for them to move closer together (not compressible)
Vibrate around a fixed point
Strong forces of attraction
Forces become repulsive as the particles get closer

Particles are held together strongly

Front 7

How are particles arranged in a liquid? (3 marks)

Back 7

As tightly packed as solids
Weak bonds, allowing them to slide over each other
Medium kinetic energy

Front 8

How are particles arranged in a gas? (5 marks)

Back 8

Far apart
Space between particles so can be compressed
Move randomly
No forces of attraction
Spread out in all directions (fill the container)

Front 9

The change of state from solid to liquid is called what? (1 mark)

Back 9

Melting

Front 10

The change of state from liquid to gas is called what? (1 mark)

Back 10

Evaporation

Front 11

The change of state from gas to liquid is called what? (1 mark)

Back 11

Condensation

Front 12

The change of state from liquid to solid is called what? (1 mark)

Back 12

Freezing or solidifying

Front 13

The change of state from solid straight to gas is called what? (1 mark)

Back 13

Sublimation

Front 14

How is heat energy transferred in conduction? (3 marks)

Back 14

Particles are closely packed
Particles vibrate when heated
Particles pass on kinetic energy to the next particle making that vibrate

Front 15

Why are metals the best conductors? (3 marks)

Back 15

Metals have free electrons between the ions
The free electrons gain kinetic energy and move faster
The electrons move around the metal, collide with other electrons and ions transferring the energy

Front 16

How is heat transferred in convection? (5 marks)

Back 16

Liquid particles absorb heat energy

Particles gain kinetic energy, move faster and move apart
Liquid becomes less dense and rises
Particles begin to cool, lose kinetic energy, move back together
Liquid become more dense and sinks

Front 17

What factors affect the rate of evaporation? (3 marks)

Back 17

Increasing the liquid’s surface area

Increasing the liquid’s temperature
Increasing the draught across the liquid surface

Front 18

Why does evaporation decrease the temperature of a liquid? (3 marks)

Back 18

Particles with most energy leave the liquid
The mean/average energy of remaining particles goes down
The lower the average energy the lower the temperature

Front 19

What factors affect the rate of condensation? (2 marks)

Back 19

Increasing the area of the surface
Decreasing the temperature of the surface

Front 20

What factors increase the rate of energy transfer? (1 mark)

Back 20

The bigger the temperature difference the faster the rate of energy transfer

Front 21

What is a U-Value? (1 mark)

Back 21

How effective a material is as an insulator or at keeping energy in

Front 22

What does a low U-Value mean? (1 mark)

Back 22

The lower the U-Value the better the insulator or the less heat loss

Front 23

What can the water in some solar panels be used for? (1 mark)

Back 23

For heating buildings or to provide hot water in the home

Front 24

What is meant by the Specific Heat Capacity of a substance? (1 mark)

Back 24

The amount of energy required to raise the temperature of 1kg of a substance by 1°C

Front 25

What is the equation to find out the energy required to heat up a substance (Specific Heat Capacity equation)? (1 mark)

Back 25

E = m x c x θ

Front 26

What do you need to check when using this equation? (3 marks)

Back 26

E is in Jules
M is in Kg
Θ is the CHANGE in temperature