Topic 3//Particle Model of Matter

Question 1

Describe arrangement in solids

Answer 1

1. Strong forces of attraction hold particles together in fixed regular arrangement
2. Dont have much energy so only vibrate in fixed position
3. Particles are close together so have highest density

Question 2

Describe the arrangement in liquids

Answer 2

1. Weaker forces of attraction than solids
2. Forms irregular arrangement because particles slide over each other
3. More energy than solids
4. Less dense than solids

Question 3

Describe arrangement in gases

Answer 3

1. Almost no forces of attraction between particles
2. They have the most energy
3. They are free to move around
4. Low densities

Question 4

What is formula for density

Answer 4

Density=Mass/Volume
Kg/m3 = Kg / m3

Question 5

Define density

Answer 5

A measure of how compact a substance is

Question 6

What happens if you compress an object together

Answer 6

The density will increase because particles become packed tightly together

Question 7

What is the internal energy of a system made up of

Answer 7

Made up of total energy that particles have in their kinetic and potential energy store

Question 8

When does a change of state occur when heating

Answer 8

When substance is heated enough, particles will have enough energy in their kinetic energy store to break the bonds holding them together. Also internal energy increases

Question 9

When does a change of state occur when cooling

Answer 9

When cooling, the particles lose energy from their kinetic energy store and then form bonds. Also internal energy descreases

Question 10

What is specific latent heat capacity

Answer 10

Energy needed to change the state of a 1 Kg substance without changing its temperature

Question 11

What is specific latent heat for cooling

Answer 11

The energy released by a change in state

Question 12

What is the formula for specific laten heat

Answer 12

Energy(J) = Mass(Kg) x Specific latent heat(J/Kg)