p3

Question 1

what kind of a change is a change of state

Answer 1

physical change

Question 2

what changes when state changes

Answer 2

density and energy

Question 3

what is internal energy

Answer 3

internal energy is the total energy a particle in a system has and is made up of potential and kinetic energy

Question 4

what two things can happen when internal energy is increased

Answer 4

1. temperature of a substance is raised
   or
2. change of state produced

Question 5

what is specific latent heat

Answer 5

specific latent heat is the amount of energy needed per kilogram of a substance to change from one state to another without changing its temperature

Question 6

specific latent heat of _______ covers freezing and melting

Answer 6

fusion

Question 7

specific latent heat of _______ covers evaporation and condensation

Answer 7

vaporisation

Question 8

what is the equation for specific latent heat

Answer 8

specific latent heat = energy / mass

specific latent heat - L ( J/kg )
energy - E ( J )
mass - m ( kg )

Question 9

what is pressure

Answer 9

pressure involves collisions between particles and walls of their container

Question 10

how will increasing temperature affect the pressure exerted by a gas in a container? (4)

Answer 10

• particles gain kinetic energy
• force exerted by each particle on the walls is larger
• higher rate collisions between other particles and walls of container
• pressure increases

Question 11

if temperature stays constant how do you work out pressure

Answer 11

pV = constant
p - pressure ( Pa )
V - volume ( m^3 )