P1.1/2

Question 1

What is density

Answer 1

Density is a measure of how much matter is contained within a given volume.

Question 2

Formula for density

Answer 2

ρ = 𝐦/𝐕

Question 3

What is temperature

Answer 3

Temperature is the measure of the average kinetic energy of particles in a substance

Question 4

If you increase the temp…

Answer 4

You increase the energy

Question 5

What is internal energy

Answer 5

Kinetic energy + potential energy

Question 6

Kelvin =

Answer 6

Degree Celsius + 273

Question 7

Absolute 0

Answer 7

-273 degrees or 0 Kelvin

Question 8

Zero Kelvin implies

Answer 8

Zero kinetic energy

Question 9

What is specific heat capacity

Answer 9

The heat energy required to raise the temperature of 1kg of a substance by 1 Kelvin.

Question 10

Units of specific heat capacity

Answer 10

J/kgK

Joules per kilogram Kelvin

Question 11

The lower the specific heat capacity…

Answer 11

the easier/quicker the substance will change temperature, as less energy is required.

Question 12

Specific heat capacity formula

Answer 12

E = m x c x Δϴ

E = energy supplied, J
m = mass of substance, kg
c = specific heat capacity, J/kg oC or K
Δϴ = temperature change, oC or K

Question 13

In a temperature - time graph…

Answer 13

Melting/boiling points are the vertical lines

Implying there is no temp change / KE change during a state change

Question 14

What is potential energy

Answer 14

Energy due to the position of the particles + the strengths of bonds between them

Question 15

If a temperature change occurs during heating/cooling…

Answer 15

Only KE has changed

• specific heat capacity

Question 16

If a state change occurs during heating/cooling…

Answer 16

Only potential energy has changed

Intermolecular bonds are weakened
- specific latent heat

Question 17

What is specific latent heat of fusion

Answer 17

The heat energy transferred when 1kg of a substance changes fromthe solid state to the liquid state.
(or liquid -> solid)

Question 18

What is specific latent heat of vaporisation

Answer 18

The heat energy transferred when 1kg of a substance changes fromthe liquid state to the gas state.
(or gas -> liquid)

Question 19

Specific latent heat equation

Answer 19

E = m x L

L = specific latent heat of fusion/vaporisation

= J/kg