Chemistry2 7G Particles

Question 1

What state of matter does this picture show?

Answer 1

Solid

Question 2

What state of matter does this picture show?

Answer 2

Gas

Question 3

What state of matter does this picture show?

Answer 3

Liquid

Question 4

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

Answer 4

Solid

Question 5

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

Answer 5

Solid and liquid

Question 6

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

Answer 6

Gas

Question 7

Which state(s) of matter flow easily?

Answer 7

Liquid and Gas

Question 8

How do the particles move in a solid?

Answer 8

They cannot move and are in a fixed position.

Question 9

How do the particles move in a liquid?

Answer 9

They can move past each other

Question 10

How do the particles move in a gas?

Answer 10

They move very quickly?

Question 11

What is diffusion?

Answer 11

The random movement of particles until they are evenly spread.

Question 12

Why can diffusion not happen in a solid?

Answer 12

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

Question 13

What causes pressure?

Answer 13

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

Question 14

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

Answer 14

The pressure increases because there are more air particles.

Question 15

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

Answer 15

Warmer temperatures because the particles have more energy.

Question 16

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

Answer 16

He thought they were alive.

Question 17

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

Answer 17

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.

Question 18

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

Answer 18

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

Question 19

What is a liquid

Answer 19

Something with a fixed volume but no fixed shape.

Question 20

What is a chemical compound

.

Answer 20

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

Question 21

Give a description of a liquid.

Answer 21

Something with a fixed volume but no fixed shape.

Question 22

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

Answer 22

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

Question 23

what is meant by flammable ?

Answer 23

Easily set on fire.

Question 24

What are the tree states of matter ?

Answer 24

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

Question 25

what happens to a tyre to make it flat ?

Answer 25

Some of the air is released.

Question 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 ?

Answer 26

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

Question 27

what is a hazard ?

Answer 27

Something that could cause harm.

Question 28

What is air pressure?

Answer 28

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

Question 29

What do scientists mean by a vacuum ?

Answer 29

A completely empty space, containing no particles.

Question 30

Describe how gas pressure can be changed in a tyre .

Answer 30

By Blowing it up or letting air out.