(P2)Particle Model

Question 1

When a solid changes to a gas, what is this called?

Answer 1

Sublimation (thermal energy transferred to the system)

Question 2

How do you calculate density?

Answer 2

Mass / volume

Question 3

Why are gases low density?

Answer 3

Because the particles are spread out, so the number of particles in a given volume is low

Question 4

What is specific heat capacity?

Answer 4

The thermal energy that must be transferred to change the temperature of 1kg of a material by 1 degree

Question 5

What is specific latent heat? Identify the two types

Answer 5

The amount of energy that must be transferred to change 1kg of a material from one state of matter to another.
Specific latent heat of fusion - solid and liquid
Specific latent heat of vaporisation - liquid and gas

Question 6

What does the pressure of gas depend on? How can it be increased?

Answer 6

It depends on the motion of the particles of the gas, which exert a force at right angles to the wall.
Pressure can be increase by increasing temp, increasing mass or decreasing volume

Question 7

How does increasing temperature increase gas pressure?

Answer 7

The molecules have a greater kinetic energy, they move faster, there are more collisions between the molecules and the walls of the container, more force is extended on the walls, pressure is increased

Question 8

How does decreasing the volume of a gas increase the pressure?

Answer 8

The gas particles will collide with the walls more frequently, causing the pressure to increase

Question 9

Why does the pressure of a liquid increase with depth?

Answer 9

Because the further down you go in the liquid, the greater there weight of liquid there will be above

Question 10

What do the pressure of a liquid depend on?

Answer 10

The density of the liquid. A greater density means that more wrought will be acting downwards