particle model of matter

Question 1

Density (kg/m^3) =

Answer 1

mass (kg) / volume (m^3)

Question 2

the particles are packed close together =

Answer 2

in solids

Question 3

the particles are free to move so the same mass takes up more space =

Answer 3

in liquids

Question 4

the particles take up a much greater volume than in liquids and solids =

Answer 4

in gases

Question 5

solid is usually denser than =

Answer 5

liquid and gas

Question 6

liquid is usually denser than =

Answer 6

gas

Question 7

solid → liquid =

Answer 7

melting

Question 8

liquid → gas =

Answer 8

evaporation

Question 9

gas → liquid =

Answer 9

condensation

Question 10

gas → solid =

Answer 10

deposition

Question 11

solid → gas =

Answer 11

sublimation

Question 12

liquid → solid =

Answer 12

freezing

Question 13

need to determine its volume.
To do this, it is placed in a known volume of
water and the amount of water displaced
equals the volume of the object =

Answer 13

finding the density of an irregular shaped
object.

Question 14

A change of state can be brought about by changing the ….

Answer 14

temperature or pressure of a material.

Question 15

the particles are moving fast enough to break
free from the solid. They are free to move relative to each
other but are held within a container =

Answer 15

in a liquid

Question 16

the particles have sufficient energy to break free
from their container. particles can move away from
their container and away from other particles =

Answer 16

in a gas

Question 17

particles can only vibrate so they cannot move
relative to each other. When the solid is heated the
particles gain kinetic energy and vibrate faster and faster =

Answer 17

in a solid

Question 18

temperature change (Δθ) =

Answer 18

change in thermal energy (ΔE) / mass (m) x specific heat capacity (C )

Question 19

the energy needed to change the state of a substance without a change in temperature =

Answer 19

Latent heat

Question 20

Energy to change state (J) =

Answer 20

mass (kg) x specific latent heat (J/kg)

Question 21

Define internal energy?

Answer 21

The total kinetic and potential energy of all the particles within a system.

Question 22

Explain the difference between latent heat of fusion and latent heat of vaporisation.

Answer 22

Latent heat of fusion is the energy needed to change between solid and liquid. Latent heat of vaporisation is the energy needed to change state between liquid and gas.

Question 23

What happens to the temperature of a gas if the average kinetic energy of the particles of the gas increases?

Answer 23

The temperature will increase