9.12.6 KEYWORDS

· Combustion – burning

· Fuel – substance that can be burned to release heat

· Fossil – remains of living thing from millions of years ago

· Fossil Fuel – remains of a living thing from millions of years ago that can be burned to release heat.

· Oxide – the substance formed when Oxygen is added to an element (eg Carbon Monoxide (CO) and Carbon Dioxide (CO₂) are Oxides of Carbon

· Soot – fine Carbon powder released by some fires (black solid)

· Products of Combustion - (what is made when a substance burns)

· Hydrocarbon – substance that contains only Carbon and Hydrogen (g CH₄ or C₆H₁₄)

· Toxic – can kill (lethal)

· Odourless – has no smell

· Acid Rain – rain with a pH less than 5.5

· Respiratory problems – difficulties breathing (eg Asthma or Bronchitis)

· Pollutant – substance in the environment that causes problems, usually released by people

· Particulates – tiny solid particles in the atmosphere (usually due to burning)

· Global Dimming – particles in the upper atmosphere reflecting the sun’s energy back into space, stopping energy reaching the ground (often soot)