Unit 1&2 - Heat

Question 1

What is the definition of heat?

Answer 1

The transfer of thermal energy from a hotter body to a colder one (J)

Question 2

What is the definition of temperature?

Answer 2

The average kinetic energy of the particles in a substance

Question 3

What does latent heat mean when talking about a substance?

Answer 3

The amount of energy required to change the state of the substance.

Question 4

What is the equation of latent heat?

Answer 4

Energy = mass x specific latent heat

Question 5

What does specific heat capacity mean when talking about a substance?

Answer 5

The amount of heat energy needed to raise 1kg of a substance by 1’C

Question 6

Convert 0’C to Kelvin

Answer 6

273K

Question 7

Convert 373K to Celsius

Answer 7

100’C

Question 8

What is the main point of conduction and what state(s) does it occur?

Answer 8

Solid & Liquids; the vibrating of particles transfer energy to neighbouring particles.

Question 9

What is the main point of convection and what state(s) does it occur?

Answer 9

Liquids & Vapours; Hot air rises cold air sinks.

Question 10

What is the main point of radiation?

Hint: Something to do with colour.

Answer 10

Black surfaces absorb; white surfaces reflect.

Question 11

What is the cycle of the refrigerator as the coolant travels around?

Answer 11

Evaporator, Compressor, Condenser, Expansion valve. Repeat.

Question 12

What is thermal equilibrium?

Answer 12

Heat lost = heat gained

When 2 substances are combined and reach the same temperature so that no energy is transferred.