Particle Model Of Matter- 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 affect the energy of a substance?

Answer 2

Heating transfers energy to the substances
It increases the energy of the particles that make up the substance

Question 3

What two things can heating a substance do?

Answer 3

Raise its temperature
Change the state of a substance

Question 4

What three factors determine the temperature change of a system?

Answer 4

Mass of substance
Type of material
Energy inputted into the system

Question 5

State the equation used to calculate temperature change when a substance is heated?

Answer 5

Change in thermal energy(j) x mass(kg) x specific heat capacity x change in temp(c)

Question 6

Define specific heat capacity?

Answer 6

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

Question 7

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

Answer 7

The internal energy of the substance will be increased or decreased
The temperature of the substance 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 units?

Answer 9

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

Question 10

What is specific latent heat of fusion?

Answer 10

The energy required to change 1kg of a substance from solid state to liquid state without a change in temperature

Question 11

What is the specific latent heat of vaporisation?

Answer 11

The energy required to change 1kg of a substance from liquid state to gas state without a change in temperature