Change of State

Question 1

Unit for temperature

Answer 1

Degrees celsius (°C)

Question 2

Unit for thermodynamic temperature

Answer 2

Kelvin (K)

Question 3

Unit for energy

Answer 3

Joule (J)

Question 4

Unit for mass

Answer 4

Kilogram (Kg)

Question 5

Unit for density

Answer 5

Kilogram/ metre^3 (Kg/m^3)

Question 6

Unit for length

Answer 6

Metre (m)

Question 7

Unit for area

Answer 7

Metre^2 (m^2)

Question 8

Unit for volume

Answer 8

Metre^3 (m^3)

Question 9

Unit for speed/ velocity

Answer 9

Metre/ second (m/s)

Question 10

Unit for force

Answer 10

Newton (N)

Question 11

Unit for acceleration

Answer 11

Metre/ second^2 (m/s^2)

Question 12

Unit for pressure/ stress

Answer 12

Pascal (Pa)

Question 13

What are particles like in a solid?

Answer 13

They:
Vibrate about a fixed point
Are close together
Have a fixed shape
Have strong intermolecular forces

Question 14

What are particles like in a liquid?

Answer 14

They:
Can flow
Are close together
Take the shape of the bottom of the container
Have weaker intermolecular forces in comparison to solids

Question 15

What are particles like in a gas?

Answer 15

They:
Are free moving
Are very far apart
Take the shape of the container
Very weak intermolecular forces (weakest)

Question 16

Where is the energy in a substances thermal energy store?

Answer 16

Energy in a substances thermal energy store is held by its particles in their kinetic energy stores

Question 17

What happens when you heat a substance (kinetic energy stores)?

Answer 17

Extra energy is transferred into the particles kinetic energy stores making them move faster until the forces overcome (changing state)

Question 18

What occurs in boiling?

Answer 18

It occurs at a fixed temp (if pressure is constant)
Bubbles form during boiling
Boiling occurs throughout the liquid

Question 19

What occurs in evaporation?

Answer 19

It can occur at any temperature
It occurs at the surface

Question 20

What is specific heat capacity?

Answer 20

It is the amount of energy required to increase the temperature of a unit mass (g or kg) by 1°C without change of phase.

Question 21

What is the equation for specific heat capacity (using specific heat capacity, change in thermal energy, mass, change in temperature)?

Answer 21

Change in thermal energy = mass × specific heat capacity × change in
temperature
ΔQ = m × c × ΔT