Chapter 17 - Thermochemistry

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3/30/2013 Thermochemical Equations• How can you express the enthalpy (heat) change for areaction in a chemical equation?• In a chemical equation, the enthalpy (heat) change for thereaction can be written as either a reactant or a product.• In exothermic reactions, heat is given off to thesurroundings, and shown as a product.• In endothermic reactions, heat is taken in from thesurroundings, and is shown as a reactant.• A chemical equation that includes the enthalpy changeis called a thermochemical equation.14
3/30/2013• The heat of reaction is the enthalpy change for thechemical equation exactly as it is written.• Exothermic reactions have a negative heat of reaction,and endothermic reactions have a positive heat ofreaction.• Reference table IExothermic Reaction15
Page 3 and 4: 3/30/2013• When fuel is burned in
Page 5 and 6: 3/30/2013• An exothermic process
Page 7 and 8: 3/30/2013 Heat Capacity and Specifi
Page 9 and 10: 3/30/2013• Because it is mostly w
Page 11 and 12: 3/30/2013 Calorimetry◦ What basic
Page 13: 3/30/2013 A small pebble is heated
Page 17 and 18: 3/30/2013The production of iron and
Page 19 and 20: 3/30/2013 Heats of Fusion and Solid
Page 21 and 22: 3/30/2013How many kJ of heat are re
Page 23 and 24: 3/30/2013• Enthalpy changes accom
Page 25 and 26: 3/30/2013How many kJ of heat are ab
Page 27 and 28: 3/30/2013How many moles of NH 4 NO
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Chapter 17 - Thermochemistry

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