AQA · GCSE · Combined Science
Course version: 8464 · Version from Sept 2018
Temperature changes in a system and specific heat capacity: The increase in temperature depends on the mass of the substance heated, the type of material and the energy input to the system.
When energy is transferred to a substance, its temperature rise is not fixed: it depends on three linked factors.
- 3 key terms
Study notes
From the checked teaching notes for this specification point.
The idea
When energy is transferred to a substance, its temperature rise is not fixed: it depends on three linked factors. A larger mass needs more energy for the same rise, because more particles must gain energy. The material matters because substances have different specific heat capacities, so equal masses of water and aluminium warm by different amounts for the same energy. The energy input also matters: doubling the energy transferred roughly doubles the temperature change, provided no change of state occurs.
For example: Heating 1 kg of water with 4200 J raises it by about 1 °C, whereas 2 kg rises by about 0.5 °C. This relationship underpins the equation ΔE = mcΔθ and explains why the same heater warms a small mass faster than a large one.
What earns the marks
- State that temperature rise is directly proportional to the energy transferred when mass and material are unchanged.
- Explain that a greater mass requires more energy to produce the same temperature rise because more particles gain energy.
- Explain that different materials have different specific heat capacities, so equal masses warm by different amounts for the same energy.
- Use the relationship ΔE = mcΔθ to show how mass, specific heat capacity and temperature change are linked.
- Apply the idea to a practical context, such as comparing heating 1 kg and 2 kg of water with the same heater for the same time.
Common mistakes and how to put them right
Assuming temperature rise depends only on energy input.
Put it right: Mass and material also affect the rise.
Treating specific heat capacity as the same for all substances.
Put it right: Each material has its own value, for example water is about 4200 J/kg °C.
Ignoring that a change of state absorbs energy without temperature change.
Put it right: The relationship applies while the substance remains in one state.
Exam tips
- Identify the independent variable, dependent variable and control variables when describing a heating investigation.
- Use the equation ΔE = mcΔθ and substitute values with consistent units before rearranging.
- Compare two heating situations by stating which factor changes and which stay constant.
Try the lesson
The start of the Temperature changes in a system and specific heat capacity: The increase in temperature depends on the mass of the substance heated, the type of material and the energy input to the system. lesson, made from checked teaching notes for this specification point.
Have a go first
Two identical heaters supply the same amount of energy to two water samples. Sample A has a mass of 1 kg and sample B has a mass of 2 kg. Which sample has the smaller increase in temperature?
Listen
When energy is transferred to a substance, its temperature rise is not fixed: it depends on three linked factors. A larger mass needs more energy for the same rise, because more particles must gain energy. The material matters because substances have different specific heat capacities, so equal masses of water and aluminium warm by different amounts for the same energy. The energy input also matters: doubling the energy transferred roughly doubles the temperature change, provided no change of state occurs. For example, heating 1 kg of water with 4200 J raises it by about 1 °C, whereas 2 kg rises by about 0.5 °C. This relationship underpins the equation ΔE = mcΔθ and explains why the same heater warms a small mass faster than a large one. A strong answer earns marks for these points. State that temperature rise is directly proportional to the energy transferred when mass and material are unchanged. Explain that a greater mass requires more energy to produce the same temperature rise because more particles gain energy. Explain that different materials have different specific heat capacities, so equal masses warm by different amounts for the same energy. Use the relationship ΔE = mcΔθ to show how mass, specific heat capacity and temperature change are linked. A common slip: Assuming temperature rise depends only on energy input. Instead, mass and material also affect the rise. Exam tip: Identify the independent variable, dependent variable and control variables when describing a heating investigation.
Key words
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Specific heat capacity
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Energy input
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Temperature change
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See every definition
- Specific heat capacity
- A property of a material that means equal masses of different substances warm by different amounts for the same energy.
- Energy input
- The energy transferred to the system, where doubling it roughly doubles the temperature change provided no change of state occurs.
- Temperature change
- The rise in temperature, which is directly proportional to the energy transferred when mass and material are unchanged.
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