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Heating up

Heating up. • Relate a rise in the temperature of a body to an increase in internal energy • Show an understanding of the term thermal capacity Supplement • Describe an experiment to measure the specific heat capacity of a substance. Aims. That heat energy is measured in joules

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Heating up

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  1. Heating up • Relate a rise in the temperature of a body to an increasein internalenergy • Show an understanding of the term thermal capacity Supplement • Describe an experiment to measure the specific heat capacity of a substance

  2. Aims • That heat energy is measured in joules • That adding heat energy can raise the temperature of a material • That materials have a Specific Heat Capacity • To use these ideas to solve problems.

  3. To do • Watch or carry out the experiment • Whilst you are waiting for the clock to reach 300s Start drawing the diagram. • Record your result (What is the temperature change?) • Make a prediction ‘I think that if I use twice as much energy (VIt) the temperature rise for 1kg of water will be ………….oC

  4. Do other substances need as much energy as water? • Copy the title • Watch or Carry out the experiment • Record your result (s) • Compare your result(s) with the temperature rise for water • Readp116

  5. Conclusion • The same amount of energy will raise the ……………. of different substances by ……………. Amounts. • e.g. the temperature rise for aluminium is about ……. Times the rise for water for the …………….. Amount of energy put in. • The amount of energy needed to raise the temperature of 1kg of a substance by 1 oC is called the ……………… …………. ……………

  6. More to do • Answerq1 -3 on p 117 • Show all working like this • Write down the formula - • energy transferred = mass x specific heat capacity x temperature rise • Rearrange – • specific heat capacity = energy transferred /mass x temperature rise • Substitute in values • specific heat capacity = 10000/(5x10) • State answer • specific heat capacity =500 J/kgK • Check units and calculation

  7. Homework

  8. Heat Summary • When an object is heated the internal energy goes up • The unit of energy is Joules (J) • Energy needed to change = specific heat × mass × change intemperature capacity temperature

  9. Chapter 7 : Measuring Heat • The unit of energy is the ______1kJ means one ________ ______1MJ means one ________ ______ • The specific heat capacity of a substance is the amount of ________ needed to raise one ________ of the substance through __°C.The unit of specific heat capacity is ________

  10. Answers Chapter 7 : Measuring Heat • The unit of energy is the ______1kJ means one ________ ______1MJ means one ________ ______ • The specific heat capacity of a substance is the amount of ________ needed to raise one ________ of the substance through __°C.The unit of specific heat capacityis ________ Joule (J). thousand joules. million joules. energy kilogram 1 J per kg per °C

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