chemistry

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Across
  1. 3. formed as a result of incomplete combustion
  2. 5. combustion a fuel (typically a hydrocarbon) reacts fully with a plentiful supply of oxygen
Down
  1. 1. gas a gas that does not readily react chemically with other substances
  2. 2. dry air gas that does not contain water vapour
  3. 4. gas that common in residential settings from gas boilers, cookers, heaters, wood/coal fires, and generators