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Heat energy changes in chemical reactions

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Question 82

Dissolving potassium nitrate in water is an endothermic process.

Figure 1 shows the reaction profile for this process.

A reaction profile diagram with energy on the vertical y-axis and progress of reaction on the horizontal x-axis. On the left, a horizontal line represents the energy level of the reactants: KNO_3(s) + H_2O(l). The curve goes upwards, peaks, and then ends on a horizontal line representing the products: K^+(aq) + NO_3^-(aq). The products line is clearly higher up on the y-axis (at a higher energy level) than the reactants line.

Explain how Figure 1 shows that dissolving potassium nitrate in water is an endothermic process.

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Heat energy changes in chemical reactions Questions

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

Practise Edexcel GCSE Chemistry Heat energy changes in chemical reactions with exam-style questions for Foundation and Higher tier. 130 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

Question bank