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• Understand that energy is conserved.

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Presentation on theme: "• Understand that energy is conserved."— Presentation transcript:

1 • Understand that energy is conserved.
Week 22 • Understand that energy is conserved. • Explain that all chemical reactions are accompanied by enthalpy changes. • Explain that enthalpy change can be exothermic or endothermic. © Pearson Education Ltd 2008 This document may have been altered from the original

2 An exothermic enthalpy change
Week 22 An exothermic enthalpy change © Pearson Education Ltd 2008 This document may have been altered from the original

3 An endothermic enthalpy change
Week 22 An endothermic enthalpy change © Pearson Education Ltd 2008 This document may have been altered from the original

4 Week 22 Self-cooling beer can © Pearson Education Ltd 2008
This document may have been altered from the original

5 • Describe the importance of oxidation as an exothermic process.
Week 22 • Describe the importance of oxidation as an exothermic process. • Explain that endothermic processes require an input of heat energy. © Pearson Education Ltd 2008 This document may have been altered from the original

6 • Construct a simple enthalpy profile diagram for a reaction.
Week 22 • Construct a simple enthalpy profile diagram for a reaction. • Explain the term activation energy using enthalpy profile diagrams. © Pearson Education Ltd 2008 This document may have been altered from the original

7 Enthalpy profile diagram for an exothermic reaction
Week 22 Enthalpy profile diagram for an exothermic reaction © Pearson Education Ltd 2008 This document may have been altered from the original

8 Enthalpy profile diagram for an endothermic reaction
Week 22 Enthalpy profile diagram for an endothermic reaction © Pearson Education Ltd 2008 This document may have been altered from the original

9 Activation energy for an exothermic reaction
Week 22 Activation energy for an exothermic reaction © Pearson Education Ltd 2008 This document may have been altered from the original

10 Activation energy for an endothermic reaction
Week 22 Activation energy for an endothermic reaction © Pearson Education Ltd 2008 This document may have been altered from the original

11 Week 22 • Define and use the terms: standard conditions; enthalpy change of reaction; enthalpy change of formation; and enthalpy change of combustion. © Pearson Education Ltd 2008 This document may have been altered from the original


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