Seneca Clean Up

Question 1

What is the specific heat capacity of a substance

Answer 1

The specific heat capacity of a substance is the amount of energy needed to increase the temperature of 1 kg of that substance by 1°C.

Question 2

What is the equation for specific heat capacity

Answer 2

specific heat capacity = change in internal energy / mass (kg) x maximum temperature rise (*C)

Question 3

How does the specific heat capacity experiment work

Answer 3

. The heater increases the internal energy of the body and we measure this using a joulemeter
. We then measure the temperature of the body at the start and the maximum temperature at the end
. We then calculate specific heat capacity

Question 4

What is Leslie’s cube

Answer 4

. Leslie’s cube is a metal box with 4 different color sides (black, matte black, white, unpainted
. If you pour hot water into the cube, the matte (dull) black side will emit more infra-red radiation than the other sides
. The infra-red radiation emitted is measured using a thermopile (a sensitive thermometer)

Question 5

What are the units for thermal capacity

Answer 5

J/*C

Question 6

What is another term for melting point

Answer 6

Fusion temperature

Question 7

What is latent heat

Answer 7

Latent heat is the energy that is transferred to a substance without the substance’s temperature changing. This happens when a substance is changing state.

Question 8

Where does latent heat go

Answer 8

When a substance changes state, this energy is absorbed (used) to create or weaken bonds, rather than transfer kinetic energy to a substance’s particles.

Question 9

Why isn’t latent heat measured

Answer 9

If we measure energy using the change in temperature, this energy transfer (latent heat) will not be measured.
The energy is transferred without the temperature changing

Question 10

What is the formula for Energy Change for Change of state (specific latent heat)

Answer 10

E = m x l
E = energy needed for change of state
m = mass
l = specific latent heat

Question 11

What are the units of latent heat of vaporization?

Answer 11

J / kg

Question 12

Formula for specific latent heat of fusion

Answer 12

specific latent heat = energy change ÷ mass

Question 13

Formula for specific latent heat of vaporisation

Answer 13

specific latent heat = energy change ÷ change in mass

Question 14

Formula for heat energy

Answer 14

Q = mcΔT
Q = heat energy
m = mass
c = specific heat energy
ΔT = Change in temperature