questionmark.gifmulti-word fill quiz 9Hwf2 on "Using chemistry"
(a doc brown worksheet for QCA KS3 science-chemistry)

Site Meter* Do online OR printout, do, return to check answers. * KS3 Science Index * EMAIL comment?query * Doc Brown's Chemistry updated June 11th 2009 *

   carbon      cell      electrically      expensive      explosive      flammable      fossil      hydrogen      monoxide      petrol      pollution      pressure      reactivity      sources      voltage      water   
hws5.gif1. If there is not sufficient oxygen present a fuel is not completely burned and carcinogenic 'sooty' and the very toxic gas carbon may be formed.

flammable.gif2. Fuels like are very useful but must be carefully stored because they are so .

3a. As we have seen, there are problems with using fuels.
3b. The gas is in some ways an ideal fuel because it burns very cleanly to form only one product, !
3c. However, it is a very gas and would have to be stored under in cylinders.

SimpleCell.gif4a. There are other chemical of energy, but they are usually due to the cost of chemicals.
4b. For example a simple can be made from two different metals dipped into an conducting salt solution.
4c. The greater the difference in , the bigger the produced.