| Method |
Precise Learning Objective |
Linked |
Question / Activity
(Designed for maximum working out) |
Stepping Stones |
Pitstop Check
(Thinking Map) |
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Catalysts change the rate of chemical reactions but are not used up during the reaction. Different reactions need different catalysts. |
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What are the key characteristics of a catalyst? demo:
Elephants toothpaste |
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Enzymes act as catalysts in biological systems. |
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What is an example of a biological catalyst? Find out which is the best catalyst at decomposing hydrogen peroxide |
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Catalysts increase the rate of reaction by providing a different pathway for the reaction that has a lower activation energy.
* An opportunity to investigate the catalytic effect of adding different metal salts to a reaction such as the decomposition of hydrogen peroxide. |
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How do catalysts increase the rate of chemical reactions? |
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A reaction profile for a catalysed reaction can be drawn in the following form: (energy level diagram with reduced Ea with catalyst) |
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What would the reaction profile for a reaction in the presence of a catalyst look like compared to the same reaction without a catalyst? Students draw their predicted reaction profiles for with and without a catalyst -> evaluate and correct. |
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Students should be able to identify catalysts in reactions from their effect on the rate of reaction and because they are not included in the chemical equation for the reaction. |
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Are catalysts included in the equation for a chemical reaction? Give a reason for your answer. |
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Students should be able to explain catalytic action in terms of activation energy. |
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What is the relationship between catalytic action and activation energy? |
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Students do not need to know the names of catalysts other than those specified in the subject content. |
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What is the name of the catalyst used in the extraction of aluminium oxide? Why are catalysts used in industry?
Go further: You are in charge of a factory producing a chemical. Which factor would you change to increase the rate of reaction? Why? |
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Students should be able to recall how the presence of a catalyst affects the rate of chemical reactions. |
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How does the presence of a catalyst affect the rate of a chemical reaction? |
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