Chemistry.

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Across
  1. 4. stances that help a reaction proceed faster.
  2. 7. a natural catalyst
  3. 8. slow chemical change that occurs when oxygen in the air reacts with a metal.
  4. 11. WHMIS
  5. 13. results in the formation of a different substance or substances.
  6. 14. chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy.
  7. 15. every element is composed of a particle called a(n)...
  8. 16. new materials produced by the reaction.
  9. 17. material that cannot be broken down into any simpler substance
Down
  1. 1. chemical reaction that absorbs heat energy.
  2. 2. a particle smaller than an atom
  3. 3. chemical reaction that releases heat energy.
  4. 5. a chemical reaction that takes place in the cells in your body.
  5. 6. positively charged particles
  6. 9. describes how a substance interacts with other substances such as acids.
  7. 10. made of only one kind of matter and has a unique set of properties that sets it apart from any other kind of matter.
  8. 12. neutral particles