Matter

Question 1

What is density

Answer 1

A measure of the ‘compactness’ of a substance

Question 2

What is the equation for density

Answer 2

Density = Mass / volume

Question 3

What are the units for density

Answer 3

g/cm3

kg/m3

Question 4

Does density vary with size or shape

Answer 4

No

Question 5

What does the density of an object depend on

Answer 5

What it is made of

Question 6

What does the average density of an object determine

Answer 6

Whether it floats or sinks - float = lower density than the fluid

Question 7

What are the three states of matter

Answer 7

Solid, liquid, gas

Question 8

When a substance changed volume, what happens to the density

Answer 8

It also changes

Question 9

What does heating a substance do to its thermal energy store

Answer 9

It increases the energy in it

Question 10

What happens to materials that need to gain a lot of energy to warm up when they cool down

Answer 10

They release loads of energy

Question 11

What is the specific heat capacity of a substance

Answer 11

The change in energy in the substance’s thermal store needed to raise the temperature of 1kg of that substance by 1’C

Question 12

What happens to the particles in a substance when you transfer energy to the kinetic energy stores of the particles

Answer 12

They vibrate or move faster

Question 13

What happens to the energy you put in when melting or boiling a substance

Answer 13

The energy is used for breaking intermolecular bonds rather than raising the temperature

Question 14

What is the specific latent heat of a change of state

Answer 14

The amount of energy needed to change 1kg of it from one state to another without changing its temperature

Question 15

Is specific latent head the same or different for different materials

Answer 15

Different

Question 16

What is the specific latent heat for changing between a solid and a liquid called

Answer 16

The specific latent heat of vaporisation

Question 17

What is the equation for thermal energy

Answer 17

Mass x specific latent heat

Question 18

What is the kinetic theory

Answer 18

All matter is made up of very small, constantly moving particles

Question 19

What is pressure

Answer 19

The force acting from particles per unit area

Question 20

What is a closed system

Answer 20

Nothing can get in or out eg. a closed container

Question 21

What does the pressure a gas exerts on its container depend on

Answer 21

How fast the particles are going and how often they hit the walls

Question 22

What happens if you hold a gas in a sealed container with a fixed mass and volume and heat it

Answer 22

Energy is transferred to the kinetic energy stores of the gas particles and they mov faster

Question 23

If a gas is cooled, what effect does it have on the particles

Answer 23

They have less energy and move less quickly

Question 24

What causes low pressure

Answer 24

The gas is cooled as the particles hit the walls with less force and less often, so the pressure is reduced

Question 25

If you increase the temperature of something, what happens to the energy in the particles

Answer 25

It decreases

Question 26

If you decrease the temperature of something, what happens to the amount of energy in the particles

Answer 26

It decreases