(5) Solids, liquids and gases Unfinished

Question 1

5.2

use the following unit: joules/kilogram degree Celsius (J/kg °C)

Question 2

5.3

know and use the relationship between density, mass and volume

Answer 2

density = mass/volume
ρ = m/V

Question 3

5.4

practical: investigate density using direct measurements of mass and volume

Question 4

5.5

know and use the relationship between pressure, force and area

Answer 4

pressure = force/area
p = F/A

Question 5

5.6

understand how the pressure at a point in a gas or liquid at rest acts equally in all
directions

Answer 5

This means that if something is submerged in water, the water pushes on the object from all angles equally. Similarly, gases also exert pressure on things around them, and this pressure is uniform in all directions when the gas is immobile.

Question 6

5.7

know and use the relationship for pressure difference

Answer 6

pressure difference = height × density × gravitational field
strength
p = h x ρ x g

Question 7

5.8P

explain why heating a system will change the energy stored within the
system and raise its temperature or produce changes of state

Answer 7

Heating a system increases the average kinetic energyAs temperature increases in an object the average kinetic energy stored in the particles also increases.

UNFINISHED

Question 8

5.9P

describe the changes that occur when a solid melts to form a liquid, and
when a liquid evaporates or boils to form a gas