questionmark.gifmulti-word fill quiz 7Fwf4 on "Simple chemical reactions"
(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      dioxide      energy      flammable      fuel      gas      hazard      hydrogen      light      natural      oxygen      petrol      reaction      water      word   
hws4.gif1. This warning symbol means the substance is very . A substance like should be labelled with this sign.

candle04.gif2a. When substances burn they react with the gas and the reaction is fast releasing lots of heat .

2b. The release of heat is a sign that a chemical is happening. Energy is often given out as too in combustion reactions.

oilrig.gif3a. Substances that give out heat on burning can be used as a . Most fuels contain the chemical elements (C) and (H).

3b. Methane is fuel which we get from under the North Sea and is also known as .

4. Chemical reactions can be represented by equations, a sort of shorthand. When the fuel methane burns in air, the word equation is ...

methane + oxygen ==> +