questionmark.gifmulti-word fill quiz 9Hwf1 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 *

   blue      carbon      dioxide      endothermic      exothermic      fuels      heat      limewater      milky      oxygen      pink      water      white   

1. When burn they react with and release or give out lots of energy and this is called an reaction. Reactions which take in energy, perhaps causing a cooling effect, are called reactions.

2. Most fuel molecules are made of carbon and hydrogen and after complete burning they are changed to the gas and liquid .

3a. The gas can be detected by bubbling it into which turns ''.
3b. The liquid can be detected by (i) changing cobalt chloride paper from to OR (ii) by changing anhydrous copper sulphate from to .