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AQA GCSE · Question 01.3 · Particle Model of matter
A mass of 0.063 kg of water was turned into steam.
The specific latent heat of vaporisation of water is 2 260 000 J/kg.
Calculate the thermal energy transferred to the water to turn it into steam.
Use the equation:
thermal energy for a change of state = mass × specific latent heat
A mass of 0.063 kg of water was turned into steam.
The specific latent heat of vaporisation of water is 2 260 000 J/kg.
Calculate the thermal energy transferred to the water to turn it into steam.
Use the equation:
thermal energy for a change of state = mass × specific latent heat
How to approach this question
1. Write down the equation provided: thermal energy = mass × specific latent heat.
2. Identify the values given in the question: mass (m) = 0.063 kg and specific latent heat (L) = 2 260 000 J/kg.
3. Substitute these values into the equation.
4. Calculate the result using a calculator.
Full Answer
Specific latent heat of vaporisation is the energy required to change the state of 1 kg of a substance from liquid to gas without any change in temperature.
The equation to calculate the total thermal energy (E) needed for a change of state is:
E = m × L
Where:
- m is the mass of the substance (0.063 kg)
- L is the specific latent heat of vaporisation (2 260 000 J/kg)
Substituting the values:
E = 0.063 × 2 260 000
E = 142 380 J
Common mistakes
✗ Using the wrong equation. The question provides the correct one.
✗ Errors in calculation or typing the numbers into the calculator.
✗ Forgetting to write down the final answer after showing the substitution.
Practice the full AQA GCSE Physics Foundation Tier Paper 1
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