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Heat energy changes in chemical reactions

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Question 91

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]

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