Tys crossword

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Across
  1. 4. A substance that speeds up a chemical reaction without being permanently changed.
  2. 6. When one substance breaks down into two or more substances.
  3. 8. Formed from 2 or more elements proportions are always the same.
  4. 9. When one element replaces a similar element forming a new element.
  5. 10. When two or more substances combine to form another.
Down
  1. 1. When the energy given off is thermal energy.
  2. 2. The number of molecules in a chemical equation.
  3. 3. Substance with atoms that are alike
  4. 5. When a substance reacts with oxygen to produce energy in the form of light or heat.
  5. 7. When water or gas forms two ionic compounds in solution are combined.