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Heat energy changes in chemical reactions

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Question 66

Four different anhydrous salts, P, Q, R and S, are separately dissolved in equal volumes of water.

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

Complete the table:

  • to show the temperature changes when salt R and salt S dissolve (you must include the +++ or −-− sign)
  • by placing a tick (✓) in the box on the bottom row for the salt that absorbs the most heat energy from the water when it dissolves.
Salt PSalt QSalt RSalt S
Starting temperature in °C22.022.022.022.0
Final temperature in °C26.418.128.316.2
Temperature change in °C+4.4−3.9..........
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