Catalytic converter

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Across
  1. 3. oxide A harmful gas produced by cars
  2. 5. monoxide A harmful gas produced by cars
  3. 7. converter A device that reduces harmful emissions from cars
  4. 9. A chemical reaction that involves the gain of oxygen
Down
  1. 1. The process of breaking down a substance into simpler substances
  2. 2. A chemical reaction that involves the loss of oxygen
  3. 4. A metal used in catalytic converters
  4. 6. A noble gas used in catalytic converters
  5. 8. A metal used in catalytic converters