Yr9 Chemistry - Matter

Question 1

How do you calculate density and what unit?

Answer 1

Density = mass/volume 
Unit = gram/millilitres(g/mL)

Question 2

Define state of matter.

Answer 2

Solid, liquid, and gas.

Question 3

Define volume.

Answer 3

The space a substance occupies, measured in cm^3 or Litres

Question 4

What is property?

Answer 4

How a substances behaves, eg its flow

Question 5

What is compression?

Answer 5

Particles being squashed into a smaller amount of space.

Question 6

What is expansion?

Answer 6

Particles moving apart due to an increase in heat and kinetic energy taking up a larger volume.

Question 7

What is contraction?

Answer 7

Particles moving closer due to a decrease in heat and kinetic energy taking up a smaller volume.

Question 8

Define density?

Answer 8

The number of particles in a certain area determines the density. For example, more particles in a certain area would result in a higher density.

Question 9

What is melting?

Answer 9

Solid to liquid.

Question 10

What is evaporation?

Answer 10

Liquid to gas.

Question 11

What is condensation?

Answer 11

Gas to liquid.

Question 12

What is solidify/freezing?

Answer 12

Liquid to solid.

Question 13

What is sublimation?

Answer 13

Solid to gas.

Question 14

What is reverse sublimation?

Answer 14

Gas to solid.

Question 15

What is an example of solid, liquid, and gas?

Answer 15

Ice, water, and steam.

Question 16

What are the properties of a solid?

Answer 16

Any substance with a definite volume and size, and cannot be poured or compressed.

Question 17

What are the properties of a liquid?

Answer 17

Any substance that can take the shape of its container into which it’s poured and we can measure its volume.

Question 18

What are the properties of a gas?

Answer 18

Don’t have a definite shape or volume but can be poured into a container.

Question 19

How does matter expand?

Answer 19

Matter expands when particles get heated up and take up a larger volume. When expansion happens, objects become less dense.

Question 20

How does matter contract?

Answer 20

Matter contracts when particles loose heat and take up a smaller volume. When contraction happens, objects become denser.

Question 21

Explain particle theory.

Answer 21

All matter is made up of particles, there are spaces between these particles, the particles are always moving, at higher temperatures particles move faster than they do at lower temperatures, and particles don’t change size when they gain or lose energy.

Question 22

What is diffusion?

Answer 22

Particles moving from areas of high areas of concentration to lower concentration.

Question 23

Explain changes in states at different temperatures.

Answer 23

If the temperature is below the melting point the state will be SOLID. If the temperature is above the melting point the state will be LIQUID. If the temperature is above the boiling point the state will be GAS.

Question 24

Define physical and chemical change.

Answer 24

Physical change is usually reversible and effects size and shape. Chemically change is creating a new chemical substance.

Question 25

What is conduction?

Answer 25

Conduction is the transfer of heat energy from direct contact between particles. Occurs in all states.

Question 26

What is convection?

Answer 26

Convection is the transfer of heat through a fluid by the movement of the fluid itself

Question 27

What is radiation?

Answer 27

Transferring heat energy using infra red.

Question 28

Define matter

Answer 28

Matter is everything around us, anything that takes up space and has mass is matter