| Method |
Precise Learning Objective |
Linked |
Question / Activity
(Designed for maximum working out) |
Stepping Stones |
Pitstop Check
(Thinking Map) |
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In some chemical reactions, the products of the reaction can react to produce the original reactants. |
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What is a reversible reaction? Show the reversible reaction symbol - what does this mean? |
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Such reactions are called reversible reactions and are represented: A B (reversible arrow) C D |
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How can reversible reactions be represented? |
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For example: ammonium chloride (heat - reversible arrow - cool) ammonia hydrogen chloride. |
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If the reversible reaction below was heated which direction would it react?
Ammonium chloride (reversible arrow) ammonia hydrogen chloride Demo 1:
ammonium chloride is a white solid that breaks down into ammonia and hydrogen
chloride gases when heated, leave to cool to see reverse reaction. |
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If a reversible reaction is exothermic in one direction, it is endothermic in the opposite direction. |
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If a reversible reaction is exothermic in one direction, what is it in the opposite direction? Demo 2:
heat hydrous copper sulfate and then leave to cool/add water to show reverse reaction. |
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In a reversible reaction the same amount of energy is transferred in each case. For example: hydrated copper sulfate [blue] (endothermic - reversible arrow - exothermic) anhydrous copper sulfate [white] water. |
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If 3500 KJ of energy is transferred in the forward reaction, how much energy would be transferred in the reverse reaction? Show energy change sketch graphs for exothermic and endothermic reactions to help explain. |
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The direction of reversible reactions can be changed by changing the conditions. |
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How can the direction of reversible reactions be changed? Give several examples of reactions and ask students what will happen when temperature, concentration and pressure are changed.
Go further: Students are to write their own exam question based on the learning in the topic. Must include a mark scheme on the other side. Swap with another student -> answer -> hand back and peer assess. |
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