An analyst investigated the temperature changes that occur when three different anhydrous compounds, A, B, and C, are dissolved in water.
Their results are shown in the table below.
| Compound | Initial temperature of water in °C | Final temperature of mixture in °C | Temperature change in °C |
|---|---|---|---|
| A | 19.4 | 12.1 | -7.3 |
| B | 19.4 | 28.9 | +9.5 |
| C | 19.4 | 34.2 |
Explain which compound produces the largest exothermic temperature change.
You should calculate the temperature change for compound C in your answer.
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.
