Year 10 - Science
Specific latent heat (E = m L)
Energy of moving particles
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit covers energy changes in systems due to heating, forces, and electrical work. It explains reducing energy transfer via insulation, specific heat capacity, and latent heat. Emphasis is on calculations, planning experiments, data interpretation, and evaluating methods.
Lesson Summary
You will learn to make calculations using the equation E = m × L.
Key Notes
- Energy transferred to a solid at its melting point allows its particles to move further apart.
- Energy transferred to a liquid at its boiling point allows its particles to move fast enough to get even further apart.
- The energy transferred to melt a solid at its melting point is proportional to the mass of the solid.
- The energy transferred to melt 1 kg of a solid at its melting point is proportional to the solid's specific latent heat.
- The energy transferred to boil 1 kg of a liquid at its boiling point is proportional to its specific latent heat.
Vocabulary To Learn
- melting: the change of state from a solid to a liquid; happens at a fixed temperature for pure substances
- boiling: the change of state from a liquid to a gas; happens at a fixed temperature for pure substances
- specific latent heat: the change in energy when 1 kg of a substance changes state
- specific heat capacity: the change in internal energy when the temperature of 1 kg of a substance changes by 1°C
Common Mistakes To Avoid
- The temperature of ice is always 0ºC and the temperature of water in the liquid state cannot be 0°C.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Energy transferred to a solid at its melting point allows its particles to move further apart. Energy transferred to a liquid at its boiling point allows its particles to move fast enough to get even further apart.
2. Define this scientific word and use it in context. 'melting'
the change of state from a solid to a liquid; happens at a fixed temperature for pure substances. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: The temperature of ice is always 0ºC and the temperature of water in the liquid state cannot be 0°C. Correction: Make explicit observations that water can be in either or both of the solid and liquid states at 0°C.
More Lessons In This Unit
- A heating curve for water Study Guide
- Calculating specific heat capacity (∆E = m c ∆θ) Study Guide
- Calculating specific heat capacity (∆Q = m c ∆θ) Study Guide
- Effective insulation Study Guide
- Heating different substances Study Guide
- Measuring specific heat capacity Study Guide
- Specific latent heat (E = m l) Study Guide
- Specific latent heat (Q = m L) Study Guide
- Thermal conduction and insulation Study Guide
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