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A student drew a reaction profile for the reaction between hydrogen and oxygen - AQA - GCSE Chemistry - Question 7 - 2020 - Paper 1
Question 7
A student drew a reaction profile for the reaction between hydrogen and oxygen. Figure 3 shows the student's reaction profile. The student made two errors when dra... show full transcript
Worked Solution & Example Answer:A student drew a reaction profile for the reaction between hydrogen and oxygen - AQA - GCSE Chemistry - Question 7 - 2020 - Paper 1
Step 1
Error 1: Activation Energy Representation
Answer
The activation energy is represented incorrectly. In the drawing, the line representing the activation energy should originate from the level of the reactants and rise to the peak of the reaction profile. This indicates the energy required to initiate the reaction. Instead, the student has drawn the activation energy incorrectly positioned above the reactants.
Step 2
Error 2: Products Energy Level
Answer
The line representing the products of the reaction should be below the level of the reactants since the reaction between hydrogen and oxygen is exothermic and releases energy. However, the student's diagram inaccurately shows the products having more energy than the reactants or is above the reactants, which suggests an endothermic process.