Chemistry · Oct / Nov 2025 · Paper 62 · Question 4
0620
As printed in the paper
The question as text
Liquid alcohols can be burned as fuels in spirit burners. The energy given out can be used to heat water in a boiling tube as shown in Fig. 4.1. spirit burner liquid alcohol water boiling tube thermometer Fig. 4.1 Describe how to investigate which of three liquid alcohols, ethanol, propanol and butanol, heats the water in the boiling tube the fastest. You are provided with three spirit burners, samples of the three alcohols, water and common laboratory apparatus.
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
There are two valid approaches, either measuring time for a set temperature increase OR measuring temperature increase in a set time.
any 6 from:
MP1 specified/set/measured volume water
MP2 measure (start/initial) temperature (of water)
MP3 volume of water measured using a measuring cylinder or burette or (volumetric) pipette
AND
HEAT TO SET TEMPERATURE (change)
MP4 start timing when heating started / burner put under tube
MP5 heat to set temperature / set temperature rise
MP6 record/measure time taken to heat water
MP7 shortest time is fuel that heats fastest
OR
HEAT FOR A SET TIME
MP4 heat water for a specified time
MP5 measure final temp of water
MP6 calculate temperature rise
MP7 highest temperature (rise) is fuel that heats fastest
Make a free account to save your answers and see your weak topics and ask the AI why a wrong answer is wrong.