Changes of State (OCR Gateway GCSE Physics: Combined Science)

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 = 3.34 × 10⁵ J/kg.

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

	The temperature increases	The state changes	The energy stored in the water changes
A	✓	✓	✓
B	✓	✗	✗
C	✗	✓	✗
D	✗	✗	✓

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