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Preliminary chemistry

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Module 4 | Energy

Focus 4: Combustion provides another opportunity to examine the conditions under which chemical reactions occur

Lesson 1 | Energy profiles of chemical change

  • Describe the indicators of chemical reactions.

  • Outline the changes in molecules during chemical reactions in terms of bond-breaking and bond-making.

  • Explain that energy is required to break bonds and energy is released when bonds are formed.

  • Describe the energy needed to begin a chemical reaction as activation energy.

  • Describe the energy profile diagram for both endothermic and exothermic reactions.

Lesson 2 | Endothermic and exothermic reactions

  • Perform first-hand investigations to observe and describe examples of endothermic and exothermic chemical reactions.

Lesson 3 | Investigating combustion reactions

  • Solve problems and perform a first-hand investigation to measure the change in mass when a mixture such as wood is burned in an open container.

  • Identify the changes of state involved in combustion of a burning candle.

  • Describe chemical reactions by using full balanced chemical equations to summarise examples of complete and incomplete combustion.

Lesson 4 | Combustion of organic compounds

  • Identify the sources of pollution which accompany the combustion of organic compounds and explain how these can be avoided

  • Explain the relationship between ignition temperature and activation energy

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