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Specific Heat Capacity

Specific Heat Capacity. The specific heat capacity of a material is the amount of energy needed to raise the temperature of 1kg of the material by 1°C. Units J/kg°C. Lesson Outcomes. State the equation for specific heat capacity. GRADE D

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Specific Heat Capacity

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  1. Specific Heat Capacity The specific heat capacity of a material is the amount of energy needed to raise the temperature of 1kg of the material by 1°C. Units J/kg°C.

  2. Lesson Outcomes • State the equation for specific heat capacity. GRADE D • Use the equation for specific heat capacity to calculate energy transferred. GRADE C • Explain what it means for a material to have a high specific heat capacity. GRADE B

  3. At the end of a sunny day at the beach, you often notice that while the sand has become quite hot, the water has stayed cool. WHY???

  4. SAME amount of HEAT ENERGY Small TEMPERATURE RISE Large TEMPERATURE RISE WATER SAND Putting the SAME AMOUNT OF HEAT ENERGY into some materials gives a BIGGER TEMPERATURE RISE than in other materials.

  5. A higher heat capacity means a material is able to absorb and store more heat energy. Materials vary quite widely as to the amount of heat they can absorb for the same temperature rise.

  6. E = mcθ mass (kg) change in temperature (ºC) energy transferred (J) specific heat capacity (J/kgºC)

  7. E = mcθ m = c = θ =

  8. A kettle contains 1.5kg of water at a temperature of 18ºC. How much energy is needed to bring the water to the boil? GRADE C specific heat capacity of water is 4200J/kgºC

  9. Water has a very high specific heat capacity – this is why it is used in radiators. The higher the specific heat capacity – the more energy the substance can store.

  10. 50kJ of energy was transferred to a material with a mass of 5kg. The temperature increased from 20ºC to 60ºC. What is the specific heat capacity of the material? GRADE A*

  11. Lesson Outcomes • State the equation for specific heat capacity. GRADE D • Use the equation for specific heat capacity to calculate energy transferred. GRADE C • Explain what it means for a material to have a high specific heat capacity. GRADE B

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