Internal energy and energy transfers

Question 1

What is internal energy ?

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 the particles ?

Answer 2

> heating transfers energy to the substance

> 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 the substance

Question 4

What three factors determine the temperature change of a system ?

Answer 4

> the mass of the substance being heated
the type of material ( specific heat capacity )
energy inputted into the system

Question 5

State the equation for specific heat capacity ?

Answer 5

Triangle E = mc triangle 0

Question 6

Define specific heat capacity ?

Answer 6

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

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 required 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 with units .

Answer 9

E=ml
Energy required to change state ( joules j)
Mass ( kg) 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 to liquid state without a temperature change

Question 11

What is specific latent heat of vapourisation ?

Answer 11

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