Give consumer advice as to the best camping fuel, determining the heating power to boil water. Linking to topics on energy and combustion.
The open-ended nature of this investigation makes it flexible enough to be used with different age groups. Explore energy, efficiency and combustion while you develop skills in scientific enquiry – and show learners that chemistry is fun.
The investigation with student sheet is available as a pdf and MS Word document. For background information and more support with running practical problem-solving investigations in the classroom visit How to use these resources.
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Which fuel is better?
You are going on a weekend camping expedition. During the expedition, you will have to do all your own cooking and therefore you have to carry the cooking fuel with you. You have a choice of two fuels, ‘Lotahot’ or ‘Superheat’.
Decide which is the better fuel to use for boiling water and hence which fuel to take with you on the expedition. Learners will need to consider two things:
- How long it takes to boiI water.
- The quantity of fuel needed.
Check learner’s methods checked for safety, before they try their experiment.
Discussion and planning: 30 minutes (approximately).
Practical: 60 minutes.
Equipment & materials
Eye protection is essential.
Old tin cans, beakers, thermometers, tripods, gauzes, heat- resistant mats, measuring cylinders, clampstands, woodblocks, aluminium foil, metre rulers, stopclocks, top-pan balances.
Fuels – two solid fuels, eg for camping barbecues and paraffin/candle wax.
Health & Safety notes
This is an open-ended problem solving activity, so the guidance given here is necessarily incomplete. Teachers need to be particularly vigilant, and a higher degree of supervision is needed than in activities which have more closed outcomes. Students must be encouraged to take a responsible attitude towards safety, both their own and that of others. In planning an activity students should always include safety as a factor to be considered. Plans should be checked by the teacher before implementing them.
You must always comply with your employer’s procedures and in some cases may decide that a particular activity is inappropriate in your situation. Further information on Health and Safety should be obtained from reputable sources such as CLEAPSS in England, Wales and Northern Ireland and, in Scotland, SSERC.
You need to check the current hazard classification of any fuel tablets, including their appropriate disposal. Some tablets absorb moisture from the air and can spit alarmingly when ignited. Paraffin wax is of low hazard, but for other solid fuels the manufacturer’s safety data sheet should be consulted.
Ensure students use only small quantities of fuel, ie NO large containers of fuel.
NB Warn students that the fuel containers will become very hot – therefore do not touch.
It is the responsibility of the teacher to carry out a suitable risk assessment.
Old small cans are very good for this experiment as they are easy to come by, and can be regarded as disposable.
Students write a report for the “Consumer watch-dog chemistry column” in a consumer magazine.
Evaluation of solution
These are suggestions only:
- Scientific method, ie isolation of possible variables, changing one variable at a time (eg distance of flame from beaker).
- Satisfactory solution achieved, eg burning all the fuel is not a good method.
- Reasoning about which is best fuel to take on the expedition.
How would you improve this experiment if you were doing it again?
© Royal Society of Chemistry Health & safety checked May 2018 Page last updated October 2021
Based on a suggestion by R.F Kempa.