States Of Matter

Question 1

describe the physical properties of solids, liquids and gases 3.1

Answer 1

Solids: Particles vibrate slightly and are close together
Liquids: Particles move freely and take the shape of container
Gas: particles move fast and random, take up whole space

Question 2

explain what is meant by the term ‘fluid’ 3.4

Answer 2

Basically a liquid

Question 3

explain density in terms of the particle model

Answer 3

Something that has low density would have a low mass high volume
Something has a high density would have a high mass low volume

Question 4

What is the formula for density?

Answer 4

Density = mass over volume

Question 5

describe the changes in pressure of gases in terms of the increase or decrease of frequency of particle collisions

Answer 5

More collisions, higher pressure, such as heating gas

Question 6

describe the state of matter called plasma

Answer 6

Plasma gas-like state of matter occurs at 1 000 000 C eg lightning

Question 7

use the particle model to explain expansion and contraction of materials during heating and cooling

Answer 7

Contraction: particles move more slowly, distance between particles get smaller and the attraction between particles increases.
Expansion: particles move faster, distance between particles gets smaller and the attraction between particles decreases

Question 8

identify the three most common states of matter 3.1

Answer 8

Gas, liquids and solids

Question 9

describe what happens during the process of diffusion

Answer 9

Diffusion is the spreading of one substance through another

Question 10

describe the physical changes that occur during sublimation, evaporation, condensation, boiling, melting and freezing 3.5

Answer 10

Sublimation: Transformation of solid to gas without turning into liquid
Evaporation: When a liquid turns to gas
Condensation: Opposite of evaporation
Boiling: Evaporation happens quickly
Melting: Solid to liquid opposite is freezing

Question 11

relate changes of state to the motion of particles as energy is added or removed 3.5

Answer 11

As energy is added, the particles speed up and when removed they slow down

Question 12

explain the changing behaviour of particles during changes of state

Answer 12

Solids particles a fixed and vibrate slightly, liquids particles virbrate more and take shape of container gases particles move fast and a random path amd take up whole space.

Question 13

Define mass

Answer 13

Mass: the quantity of matter in an object (usually measured in grams or kilograms)