Internal Energy And Energy Transfers

Question 1

What is the internal energy of a substance?

Answer 1

The energy stored by the particles

The sum of the total kinetic and potential energies that make up the system

Question 2

How does heating a substance affect the energy of a substance?

Answer 2

Transfers energy to the substance

Increases energy of the particles in substance

Question 3

What two things can heating a substance do?

Answer 3

Raise its temperature

Change the state of the substance

Question 4

What three factors determine the temperature change of a system?

Answer 4

Mass of substance
Type of material
Energy inputted

Question 5

State the equation used to calculate the energy needed when a substance changes state

Answer 5

Energy= mass x specific latent heat

Question 6

Define specific heat capacity

Answer 6

The amount of energy needed to increase the temperature of 1kg of a substance by 1degrees C

Question 7

Describe how the internal energy and temperature of a substance changes when a change of state occurs

Answer 7

Internal energy will be increased or decreased

Temperature will remain constant

Question 8

Define specific latent heat

Answer 8

The amount of energy needed to change the state of 1kg of a substance with no change in temperature

Question 9

State the equation for the energy required to change state.

Answer 9

Energy to change state (j)= mass(kg) x specific latent heat(j/kg)

Question 10

What is the specific latent heat of fusion?

Answer 10

Energy required to change 1kg of a substance from solid to liquid without a change in temp

Question 11

What is the specific latent heat of vaporisation

Answer 11

Energy required to change 1kg of a substance from liquid to gas without change in temp