match.jpgmulti-word fill quiz 9Hwf3 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 *

   2      C      carbon      chlorate      combustion      dioxide      energy      exothermic      fuels      O      potassium      S      sulphur   
1. Apart from burning for energy there are other everyday situations involving .

2. These reactions release lots of heat and are described as reactions.

3. For example the composition of a match head mixture is shown in the table below.
componentsymbol/formula
potassium chlorateKClO3
sulphurS
carbonC

The supplys the oxygen to burn the to carbon dioxide and the sulphur to .

balance3.gif4. Balance the symbol equations
+ O2 ==> C
S + 2 ==> O