Starter quiz
- Which of the following is the correct unit used for temperature change?
- Fahrenheit (F)
- Celsius (C)
- degrees (°)
- degrees Celsius (°C) ✓
- joules (J)
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- Why does having thick carpets help people save money on heating bills?
- Heat rises to the top of a house.
- They are poor thermal conductors and reduce heat loss to the ground. ✓
- They are good thermal conductors.
- They are much more comfortable than hard surfaces.
- This is the only place energy can escape from a house.
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- Which of the following is the correct unit for specific heat capacity?
- J
- J/°C
- J/kg
- °C/kg
- J/kg °C ✓
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- Three identical kettles are used to heat water from the same starting temperature. Kettle A contains 0.5 kg, kettle B contains 1.0 kg and kettle C contains 1.5 kg. Which statements are correct?
- All the kettles will boil at the same time.
- Kettle A will boil first. ✓
- Kettle C will boil first.
- Kettle A will boil last.
- Kettle C will boil last. ✓
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- Which of the following has the largest store of thermal energy?
- A glass of fizzy pop at a temperature of 4°C.
- A cup of tea at a temperature of 80°C.
- A bath full of cold water at 5°C.
- A bath full of warm water at 20°C.
- A bath full of hot water at 30°C. ✓
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- A small piece of red-hot metal is dropped into a large bucket of water. Which of the following statements are correct?
- The temperature of the metal changes more than the temperature of the water. ✓
- The temperature of the metal changes less than the temperature of the water.
- The temperature change of the metal and water are equal.
- The water and metal will eventually reach the same temperature. ✓
- The water will all boil and evaporate.
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Exit quiz
- Match the following key words or phrases to their definition.
- specific heat capacity⇔the change in energy required to heat 1 kg of a material by 1°C ✓
- joules⇔the unit of energy ✓
- kilograms⇔the unit of mass ✓
- degrees Celsius⇔a unit of temperature ✓
- joules per kilogram per degree Celsius⇔the unit of specific heat capacity ✓
- The energy required to heat an object and change its temperature is directly proportional to which of the following?
- mass ✓
- change in temperature ✓
- starting temperature
- specific heat capacity ✓
- starting energy
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- Water has a specific heat capacity of 4200 J/kg °C, calculate the energy required to increase the temperature of 1.5 kg of water from 30°C to 80°C.
- 140 kJ
- 189 kJ
- 210 kJ
- 315 kJ ✓
- 504 kJ
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- A heater increases the temperature of samples of different materials by 10°C. Starting with the greatest, sort the samples in order of specific heat capacity, based on the given masses and energy.
- 1⇔mass: 200 g; energy required: 900 J
- 2⇔mass: 200 g; energy required: 300 J
- 3⇔mass: 100 g; energy required: 100 J
- 4⇔mass: 100 g; energy required: 50 J
- 5⇔mass: 400 g; energy required: 100 J
- A sample of a new plastic has a mass of 250 g. When provided with 6.0 kJ, its temperature increases from 20°C to 50°C. Calculate the specific heat capacity of the sample.
- 0.8 J/kg °C
- 50 J/kg °C
- 500 J/kg °C
- 800 J/kg °C ✓
- 8000 J/kg °C
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- In a test, a 500 g sample of a liquid with specific heat capacity of 1500 J/kg °C is heated with 60.0 kJ of energy. The starting temperature of the sample was 5.5°C. Calculate the final temperature.
- 7.5°C
- 40.0°C
- 45.5°C
- 80.0°C
- 85.5°C ✓
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Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Energy transferred to increase the temperature of a substance by heating by a fixed amount is proportional to mass.
- Energy transferred to a substance by heating a fixed amount is proportional to the increase in temperature.
- Energy transferred to increase the temperature of a substance by heating is proportional to its specific heat capacity.
- Specific heat capacity equals the energy transferred to/by 1 kg of a material when its temperature changes by 1ºC.
- Specific heat capacity, c, is measured in joules per kilogram per degree Celsius (J/kg ºC).
Common misconception
Often, after teaching, pupils often do not understand what specific heat capacity means.
Discuss the size of a substance’s specific heat capacity in terms of how hard it is to heat up a certain mass of the substance and of how much energy needs to be transferred to heat it up.
Keywords
Specific heat capacity - The change in internal energy when the temperature of 1 kg of the material changes by 1°C.
Joules / kilogram degrees c - The unit for the specific heat capacity of a material (J/kg ºC).
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