Chemistry2 7G Particles Flashcards Preview

Year 7 Science > Chemistry2 7G Particles > Flashcards

Flashcards in Chemistry2 7G Particles Deck (33):
1

What state of matter does this picture show?

Solid

2

What state of matter does this picture show?

Gas

3

What state of matter does this picture show?

Liquid

4

 Which state(s) of matter have a fixed shape?

Solid

5

Which state(s) of matter have a fixed volume?

Solid and liquid

6

Which state(s) of matter are easy to squash? (compressible)

Gas

7

Which state(s) of matter flow easily?

Liquid and Gas

8

How do the particles move in a solid?

They cannot move and are in a fixed position.

9

How do the particles move in a liquid?

They can move past each other

10

How do the particles move in a gas?

They move very quickly?

11

What is diffusion?

The random movement of particles until they are evenly spread.

12

Why can diffusion not happen in a solid?

The particles of a solid are in a fixed potision and cannot move.

13

What causes pressure?

Particles bumping in to the walls of the container they are in.

14

What happens to the pressure inside a balloon when you blow it up? Explain why.

The pressure increases because there are more air particles.

15

Does diffusion happen faster at colder or warmer temperatures? Explain why.

Warmer temperatures because the particles have more energy.

16

How did Robert Brown first explain the random movement of pollen grains under a microscope?

He thought they were alive.

17

How did Robert Brown disprove his hypothesis that pollen grains were alive?

He looked at pollen that had been dead for 100 years which showed the same movement as the fresh pollen. The pollen could therefore not be alive.

18

Explain, using the particle theory, why Robert Browns' pollen grains were moving.

The water molecules were moving randomly and bumping in to the pollen grains which made the pollen grains move in the opposite direction.

19

What is a liquid

Something with a fixed volume but no fixed shape.

20

 What is a chemical compound

 

.
 

A substance made of more than one type of atom chemically joined together a good example is water.

21

Give a description of a liquid.

Something with a fixed volume but no fixed shape.

22

What is meant by a property, Name a property that a solid has ?

A description of how a material behaves and what it is like. Hardness is a property of some solids.

23

what is meant by flammable ?

Easily set on fire.

24

What are the tree states of matter ?

There are three different forms that a substance can be in: solid, liquid or gas. These are the three states of matter.

25

what happens to a tyre to make it flat ?

Some of the air is released.

26

Why is it when Jon spray's deodorant at the back of the room Jenny can smell it at the front of the room, what do we call this process ?

We call this diffusion , as the deodorant particles travel between the gases in the air till they reach Jenny's nose.

27

what is a hazard ?

Something that could cause harm.

28

What is air pressure?

The force on a certain area caused by air molecules hitting it.

29

What do scientists mean by a vacuum ?

A completely empty space, containing no particles.

30

Describe how gas pressure can be changed in a tyre .

By Blowing it up or letting air out.

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