A student investigated the heat energy released during the combustion of various liquid alkanes. In each experiment, the student burned exactly 0.5 g of the alkane to heat 150 cm3 of water in a simple calorimeter. The temperature rise of the water was recorded for each alkane.
| Alkane | Number of carbon atoms in one molecule | Temperature rise of water in ∘C^\circ\text{C}∘C |
|---|---|---|
| pentane | 5 | 14.5 |
| hexane | 6 | 20.0 |
| heptane | 7 | 24.5 |
| octane | 8 | 28.0 |
| nonane | 9 | 30.5 |
Draw a graph of the temperature rise of the water against the number of carbon atoms in one molecule of the alkane.
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.
