Changes of State (OCR GCSE Physics A (Gateway))

Which row describes a correct example of a physical change and a chemical change?

Which row lists the correct changes of state for specific latent heat of fusion?

Which row lists the correct changes of state for specific latent heat of vaporisation?

A student studies how the temperature falls when a liquid cools.

What is happening at point X on the graph?

Energy is needed to change ice into water.

Calculate the energy needed to change 5 kg of ice into water.

Use an equation from the data sheet to help you.

Specific latent heat of melting ice = 3.34 × 10⁵ J/kg.

A student investigates what happens when she heats a beaker of water.

Which row in the table describes what could happen when the water is heated?

A wooden block has a mass of 2 kg and a specific heat capacity of 2000 J/kg °C.

Calculate the energy needed to raise its temperature by 6°C.

Use the equation:

Change in thermal energy = Mass × Specific Heat Capacity × Change in Temperature

A student measures the energy required to change the temperature of different materials by the same amount. They use the same mass of material in each experiment.

The results are shown in the table:

Which material has the lowest specific heat capacity?

A teacher measures the temperature change of a substance as it is heated steadily from a solid to a gas.

They record their results on a graph.

Which row in the table describes the correct sections of the graph where the specific heat capacity, the specific latent heat of fusion, and the specific latent heat of vaporisation are used to calculate the corresponding changes in energy?