Combustion

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Across
  1. 1. Any element that is shiny when polished, conducts heat and electricity well
  2. 4. The variable that you chose the values of in an investigation.
  3. 6. Chemical reaction with oxygen
  4. 9. A substance that scientists once thought explained why things burn.
  5. 10. How the warming effect on the Earth’s surface is named
Down
  1. 2. A reaction that gives out energy that can be felt as it heats the surroundings.
  2. 3. A condition in which the tiny tubes leading to the alveoli become narrow and start to fill with mucus.
  3. 5. A substance that can harm the environment or the organisms that live there.
  4. 7. A compound of a metal or non-metal with oxygen
  5. 8. This property is conserved during a chemical reaction.