Particle Model Matter

Question 1

solids

Answer 1

Particles close together and arranged in a regular pattern, vibrate but don’t move

Question 2

Liquids

Answer 2

Close together but particles not arranged in a regular pattern and can move around

Question 3

Gases

Answer 3

Particles very far apart and not arranged in any pattern and move around rapidly

Question 4

Density

Answer 4

Density (kg/m cubed) = mass (kg)/ volume (m cubed)

Question 5

Density for a solid

Answer 5

High density because particles are packed closely together they gave a lot of mass

Question 6

Liquid density

Answer 6

Usually have a high density because the particles are close together liquids have a lot of mass for their volume

Question 7

Gases density

Answer 7

Low because particles are very far apart so gasss have a small mass for their volume

Question 8

Polystyrene

Answer 8

A solid but has a low density because it has a very open structure and full of air spaces so it has a small mass for its volume

Question 9

Density

Answer 9

The mass for a given volume

Question 10

What is displacement method ?

Answer 10

Used to calculate density of irregular objects

Question 11

Eureka can

Answer 11

Has a spout so water can flow out. used to measure the volume

Question 12

Internal energy

Answer 12

Energy stored in a system by the particles

Question 13

If u heat a solid…

Answer 13

We increase the internal energy

Question 14

If we cool the gas down….

Answer 14

We reduce the internal energy

Question 15

Change of state

Answer 15

Melting, boiling, freezing, condensation

Question 16

A solid turning directly to gas

Answer 16

Sublimation

Question 17

When changes of state take place mass is always…

Answer 17

Conserved. Not adding or taking away any particles

Question 18

Changes of state are what changes?

Answer 18

Physical changes(not chemical changes)

Question 19

Evaporation

Answer 19

When a liquid turns to a gas but only on the surface of the liquid

Question 20

Regular objects

Answer 20

Easy to measure

Question 21

Irregular objects

Answer 21

Aren’t easily measurable

Question 22

Internal energy

Answer 22

The energy stored in a system of particles

Total kinetic energy and potential energy of all the par lies that make up a system

Question 23

Particles include

Answer 23

Atoms and molecules

Question 24

If we heat a solid

Answer 24

We increase internal energy and some point it turns to liquid

Question 25

If we heat the liquid we continue to

Answer 25

Increase internal energy and at some point it’ll turn to gas

Question 26

If we cool gas down then it means

Answer 26

We decrease internal energy and at some point it’ll turn to liquid (condensation)

Question 27

If we cool down the liquid further then we

Answer 27

Reduce the internal energy even more and it’ll turn to a solid (freezing)

Question 28

Sublimation

Answer 28

Turning solid directly to a gas

Question 29

When changes of state takes place mass is always

Answer 29

Conserved (not adding and taking away any particles)

Question 30

What changes are changes of state?

Answer 30

Physical changes

Question 31

Specific heat capacity

Answer 31

The amount of energy required to raise the temperature

Question 32

Specific heat capacity (J/kg degrees)

Answer 32

c

Question 33

Change in thermal energy

Answer 33

(J)

Question 34

1000J =

Answer 34

1KJ

Question 35

Specific latent heat

Answer 35

Amount of energy required to change the state of 1kg of the substance with no change in temp

Question 36

Specific latent heat of fusion

Answer 36

Energy required to change 1kg of a substance from a solid to liquid with no change in temp

Question 37

Specific latent heat of vaporisation

Answer 37

Th energy required to change 1 kg of a substance from a liquid to a vapour with no change in temp

Question 38

Specific latent heat

Answer 38

(J/Kg)

Question 39

Energy for a change in state

Answer 39

(J)

Question 40

Increase number of collisions in gas particles or energy of each collisions leads to….

Answer 40

Increase pressure

Question 41

One way to increase energy of each collision or increase number of collisions

Answer 41

Increasing temp

Question 42

The temp of a gas is related to …

Answer 42

Average kinetic energy of the particles

Question 43

At low temp particles have lower…

Answer 43

Kinetic energy so fewer collisions per sec (lower energy collisions)

Question 44

At high temp particles have higher…

Answer 44

Kinetic energy so there’s more collisions per sec (higher energy collisions)