Particle Theory

Question 1

What is a particle theory ?

Answer 1

Everything is made of particles and represented by circles.

Question 2

What is the name to the circles that represent particles

Answer 2

“model”

Question 3

Why is it just a theory ?

Answer 3

Because we can’t see them(too small to see)

Question 4

Solids

Answer 4

Neat lines with no gapes
They only vibrate
Solids can’t change shape.
Can’t be compressed(squashed)

Question 5

Liquids

Answer 5

Randomly arranged but still touching.
Can move around each other
Can change shape
Can’t be compressed

Question 6

Gas

Answer 6

Randomly arranged and spread out. Move quickly in all directions.
Can change shape
Can be compressed.

Question 7

How heating up affects the particles?

Answer 7

Energy increases
Movement increases
Particles spread out(more space between them)

Question 8

How cooling down affects the particle?

Answer 8

Energy decreases
Movement decreases
Particle join together

Question 9

Solid-Liquid

Answer 9

Melting

Question 10

Liquid-Gas

Answer 10

Evaporation/Boiling

Question 11

Gas-Liquid

Answer 11

Condensation

Question 12

Liquid-Solid

Answer 12

Freezing

Question 13

Solid-Gas

Answer 13

Sublimination

Question 14

Gas-Solid

Answer 14

Deposition

Question 15

Insoluble

Answer 15

It won’t dissolve

Question 16

Solvent

Answer 16

Liquid in which the solute dissolves

Question 17

What is saturation

Answer 17

When no more solute can dissolve in the solvent.

Warmer solutions need more solute to be saturated.

Question 18

Pure substances

Answer 18

Contain only one type of particles

E.g. pure water only contains only water particles.

Question 19

Impure substances

Answer 19

Are mixtures of different types of particles.

Question 20

Soluble

Answer 20

It will dissolve

Question 21

Solute

Answer 21

Usually a solid.

It’s the material that is being dissolved

Question 22

Solution

Answer 22

The mixture of the solute and the solvent

Question 23

How can we remove an insoluble solid from the solution by filtration.

Answer 23

By filtration, the filter paper.

Question 24

What is the name of the liquid that comes out of the filter paper

Answer 24

Filtrate

Question 25

What is the name of the material left on the filter paper

Answer 25

Residue

Question 26

How can we remove a soluble substance(solute) from the solvent

Answer 26

Evaporation

Question 27

Expand

Answer 27

Get bigger because they get hotter so particles accelerate so they take more space

Question 28

Contract

Answer 28

Things get smaller because they cool down so they decelerate and take up less space

Question 29

Diffusion

Answer 29

Particles move from where there are lots of them (high concentration) to where there are few of them (low concentration).

Question 30

How can we accelerate diffusion?

Answer 30

Warm up the room because particle accelerate at higher temperatures

Question 31

How can we increase pressure

Answer 31

• Increase temperature
• Add more particles
• Reduce the size of the container

Question 32

What is pressure caused by

Answer 32

Gas particle pushing against the sides of their container

Question 33

If the pressure inside a container is higher than the one outside, it…

Answer 33

Expands

Question 34

If the pressure inside a container is lower than outside, it…

Answer 34

Contracts