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8.2 Heat energy changes in chemical reactions

8.2 Heat energy changes in chemical reactions

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Question 46

Four different salts, W, X, Y and Z, are dissolved in water.

The table below shows the starting temperature of the water and the final temperature of the solution after each salt dissolves.

Complete the table:

  • to show the temperature changes when salt Y and salt Z dissolve (include the +++ or −-− sign)
  • by placing a tick (✓) in the box, on the bottom row, for the salt that absorbs the most heat energy when it dissolves.
Salt WSalt XSalt YSalt Z
Starting temperature in °C21.021.021.021.0
Final temperature in °C24.519.225.217.5
Temperature change in °C+3.5−1.8..........
Salt that absorbed the most heat energy when it dissolved
[3]
Markscheme

8.2 Heat energy changes in chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /8.2 Heat energy changes in chemical reactions

94 exam-style questions on Edexcel GCSE Chemistry 8.2 Heat energy changes in chemical reactions, covering 8.2.1 Exothermic and endothermic changes, 8.2.2 Bond breaking, bond making and overall energy change, 8.2.3 Calculating energy change from bond energies, and 8.2.4 Activation energy and reaction profiles. Each one has a worked solution and a mark scheme showing where the marks go.

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