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Heat energy changes in chemical reactions

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Question 9

Figure 1 shows the reaction profile for an exothermic chemical reaction.

Reaction profile for an exothermic reaction. The y-axis is labelled 'Energy' and the x-axis is labelled 'Progress of reaction'. A horizontal line on the left represents the reactants. The curve rises from this line to a peak and then descends to a lower horizontal line on the right representing the products. Arrow A is a vertical double-headed arrow extending from the reactant energy level up to the peak of the curve. Arrow B is a vertical double-headed arrow extending from the reactant energy level down to the product energy level. Labels A and B point to these two arrows respectively.

Use the words or phrases from the box to complete labels A and B on Figure 1.

  • activation energy
  • overall energy change
  • products
  • reactants
a.

Label A:

[1]
b.

Label B:

[1]

Heat energy changes in chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /Heat energy changes in chemical reactions

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