This exam tips covers Exam Tips for Specific Heat Capacity within Specific Heat Capacity for GCSE Physics. Revise Specific Heat Capacity in Energy for GCSE Physics with 15 exam-style questions and 13 flashcards. This topic shows up very often in GCSE exams, so students should be able to explain it clearly, not just recognise the term. It is section 14 of 15 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
💡 Exam Tips for Specific Heat Capacity
🎯 Common Question Types:
- Calculate energy change given m, c, Δθ (2-3 marks)
- Rearrange to find temperature change or mass (3 marks)
- Explain why experimental SHC is higher than accepted (2-3 marks)
- Describe improvements to the required practical (3-4 marks)
- Explain why water is used in cooling/heating systems (2 marks)
📝 Key Command Words:
- Calculate: Show ΔE = mcΔθ with all values substituted
- Explain: Reference SHC value and what it means for heating behaviour
- Describe: Outline the practical method step by step
- Suggest: Give an improvement with a reason why it works
⚠️ Common Mistakes to Avoid:
- Using grams instead of kg — always convert (÷ 1000)
- Using final temperature not temperature CHANGE — Δθ = final − initial
- Wrong rearrangement — c = ΔE/(mΔθ), not c = mΔθ/ΔE
- Forgetting units — SHC is J/kg°C, not just J
Quick Check: In a SHC practical, the student calculates c = 950 J/kg°C for aluminium, but the accepted value is 900 J/kg°C. Explain why the result is too high.
Some of the electrical energy supplied by the heater was transferred to the thermal store of the surroundings (heat loss) rather than going into the metal block. The measured energy input (ΔE) was therefore higher than the energy actually absorbed by the block. Since c = ΔE/(mΔθ), a higher ΔE gives a higher calculated c.
Practice questions for Specific Heat Capacity
What does the specific heat capacity of a substance measure?
Water has a specific heat capacity of 4200 J/kg°C, much higher than most other common substances. Explain why this makes water useful in central heating systems.