A student investigated the temperature change when methanol is burned.
The theoretical temperature rise for burning a given mass of methanol is 78.5∘C78.5^{\circ}\text{C}78.5∘C.
In the experiment, the actual temperature rise for burning this mass of methanol was only 31.2∘C31.2^{\circ}\text{C}31.2∘C.
One reason why the temperature rise is less than expected is that the methanol does not burn completely.
Give another reason why, even if the methanol burns completely, the actual temperature rise is much less than the theoretical value.
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.
