| Method |
Precise Learning Objective |
Linked |
Question / Activity
(Designed for maximum working out) |
Stepping Stones |
Pitstop Check
(Thinking Map) |
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Energy is conserved in chemical reactions. The amount of energy in the universe at the end of a chemical reaction is the same as before the reaction takes place. |
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What does conservation of energy mean? Investigating the energy change of reactions |
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If a reaction transfers energy to the surroundings the product molecules must have less energy than the reactants, by the amount transferred. |
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In what circumstance is energy transferred to the surroundings during a chemical reaction? |
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An exothermic reaction is one that transfers energy to the surroundings so the temperature of the surroundings increases. |
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What happens to the energy in an exothermic reaction? |
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Exothermic reactions include combustion, many oxidation reactions and neutralisation. |
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What are three examples of exothermic reactions? |
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Everyday uses of exothermic reactions include self-heating cans and hand warmers. |
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What is an example of an exothermic reaction in everyday life? |
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An endothermic reaction is one that takes in energy from the surroundings so the temperature of the surroundings decreases. |
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What happens to the energy in an endothermic reaction? |
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Endothermic reactions include thermal decompositions and the reaction of citric acid and sodium hydrogencarbonate. Some sports injury packs are based on endothermic reactions. |
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What are three examples of endothermic reactions? |
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Some sports injury packs are based on endothermic reactions. |
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What is an example of an endothermic reaction in everyday life? |
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Students should be able to distinguish between exothermic and endothermic reactions on the basis of the temperature change of the surroundings |
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When a chemical reaction occurs and the temperature of the surroundings has increased, is it an exothermic or endothermic reaction? |
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Students should be able to evaluate uses and applications of exothermic and endothermic reactions given appropriate information. |
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What are the advantages of using exothermic reactions for hand warmers? |
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Limited to measurement of temperature change. Calculation of energy changes or ?H is not required. |
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What is the temperature change of the solution if the starting temperature was 20 degrees and the end temperature was -5 degrees. State if this is endothermic or exothermic. |
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