Science 3 Particles

Question 1

Define materials

Answer 1

All materials are made up of small particles. Many of them can be mixed with other materials

Question 2

Define substance

Answer 2

Some materials are not mixtures because they are made up of one substance - a substance is made up of only one material

Question 3

Define mixtures

Answer 3

Many materials are mixtures because they are made up of different materials

Question 4

Define solids

Answer 4

Particles that are squished together and move around very slightly. They are very strong items.

Question 5

Define liquids

Answer 5

Are particles that are slightly further away from each other than the solid’s particles are. They also move around more and their attachment to each other is weaker

Question 6

Define gases

Answer 6

• widely spaced out
• move around freely
• connections between the particles are fairly weak
• you can compress them

Question 7

Can you compress a solid

Answer 7

No because the particles are already tightly packed

- you can’t press them against each other anymore

Question 8

Properties of a gas

Answer 8

• easily squashed
• particles far apart
• particles move freely in all directions
• weak forces of attraction between particles
• no fixed volume, no fixed shape
• particles can move over each other

Question 9

Properties of a liquid

Answer 9

• not easily squashed
• fixed volume, shape can change
• particles close together

Question 10

Properties of a solid

Answer 10

• strong forces of attraction between particles
• volume and shape cannot change
• not easily squashed
• particles quite close together
• particles vibrate in fixed position

Question 11

Define melting

Answer 11

• is a change of state from solid to liquid

Question 12

Define melting point

Answer 12

• temperature at which a substance melts

- used to identify substances and their states

Question 13

Define freezing

Answer 13

Is a change of state from liquid to solid

Question 14

Define freezing point

Answer 14

Is the temperature at which a substance freezes at

Question 15

How/ whydoes ice melt in your hand

Answer 15

• the heat of hand transfers to the ice
• particles vibrate faster and interactions become weaker
• particles further away from each other breaking their solid pattern turning it into a liquid

Question 16

Are particles in the same substances the same

Answer 16

Yes

Question 17

The difference between a gas and a liquid

Answer 17

• particles are arranged differently
• gas particles are spread out more and behave freely
• liquid particles are more close together but still move around
• liquid particles have a strong connection towards each other

Question 18

What is the change of the state called from a solid changing into a liquid

Answer 18

Melting

Question 19

What is the change of state from a liquid to a solid is a…

Answer 19

Freezing

Question 20

Define change of state

Answer 20

Is the transition from a solid to a liquid or a liquid to a solid

Question 21

Define condensation

Answer 21

• is when two gases particles come together

- is the change of the physical state of matter from the gas phase into the liquid phase,

Question 22

Define deposition

Answer 22

• when a gas skips the liquid stage and changes directly into a solid

Question 23

Define sublimation

Answer 23

When a solid skips the liquid stage and changes into a gas

Question 24

Define precipitation

Answer 24

• only occurs in the water cycle

- when the droplets fall.

Question 25

Define diffusion

Answer 25

• is where the particles spread out or mixing

Question 26

Define low concentration

Answer 26

Where the particles are more spread out

Question 27

Define high concentration

Answer 27

Where they are compact

Question 28

Define evaporation

Answer 28

Particles weaken and escape the surroundings

Question 29

Define gas pressure

Answer 29

• Is when the particles gain so much energy
• they collide into each other and the side of the container
• eventually burst

Question 30

Define particle collisions

Answer 30

Particles merge or bump into each other

Question 31

Define pressure

Answer 31

• particles are in a container with not much space to move around as they would like
• it is when the particles are in limited space
• the particles become excited and collide into each other
• pressure builds up and leads to bursting