p3 changes of state and particle model

Question 1

what is the equation that links density, mass and volume

Answer 1

density= mass// volume

Question 2

what can the particle model be used to explain?

Answer 2

1) density
2) states of matter

Question 3

whats the process which solid turning into liquid called?

Answer 3

melting

Question 4

whats the process that liquid turning into gas called?

Answer 4

evaporating or boiling

Question 5

whats the process that gas turns into liquid called?

Answer 5

condensation

Question 6

whats the process that liquid turns into solid called?

Answer 6

freezing

Question 7

whats the process of solid turning into gas called?

Answer 7

sublimation

Question 8

what type of change is a change in state?

Answer 8

physical as its the same substance you stared with, just a different form

Question 9

what happens to the number of particles when a substance changes state?

Answer 9

the number of particles stay the same, just differently arranged. so the mass is conserved

Question 10

what is specific heat capacity?

Answer 10

the amount of energy required to raise 1kg of a substance by 1 degrees celsius

Question 11

what equation links change in thermal energy, mass, specific heat capacity and temperature change?

Answer 11

change in thermal energy= mass x SHC x temp change

Question 12

explain latent heat

Answer 12

the energy needed for a substance to change state is called the latent heat.
when a change in state occurs, the energy supplied changes the energy stored (internal energy) , but not the temperature.
this is because the energy is being used to break or weaken the bonds between the particles to change state

Question 13

what equation links energy for change in state, mass and specific latent heat?

Answer 13

energy for change in state= mass x specific latent heat

Question 14

what is specific latent heat of fusion?

Answer 14

change of state from solid to liquid

Question 15

what is the specific latent heat of vapourisation?

Answer 15

the change in state from liquid to solid

Question 16

what is the motion of gas particles like?

Answer 16

at a random and constant motion

Question 17

what does the temperature of the particles link to?

Answer 17

the kinetic energy of those particles

Question 18

how does changing the temperature of a gas at a constant volume affect the pressure?

Answer 18

increases the pressure exerted by the gas

Question 18

how does changing the temperature of a gas at a constant volume affect the pressure?

Answer 18

increases the pressure exerted by the gas

Question 19

how can a gas be compressed or expanded?

Answer 19

by changing the pressure. the pressure produces a net force at right angles to the wall of the gas container

Question 20

what equation links constant, pressure and mass?

Answer 20

constant= pressure x massh

Question 21

how can work done on a gas increase its temperature?

Answer 21

1) if you transfer energy by applying a force, work is done.
2) doing work on a gas increases its internal energy, which can increase its temperature

Question 22

methods of doing work on a gas?

Answer 22

MECHANICALLY- eg a bike pump, the gas applies pressure to the plunger of the pump and exerts a force on it. work has to be done against this force to push the plunger down
this transfers energy to the kinetic energy stores, increasing the temperature