Chemistry Puzzle

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Across
  1. 2. plants produce food using sunlight
  2. 3. a pure substance
  3. 5. group of atoms bonded together
  4. 7. the big number in front of the formula
  5. 8. the smallest particle of matter
  6. 9. the small number behind the element
  7. 10. substance formed as a result of a chemical reaction
Down
  1. 1. describes a chemical reaction
  2. 4. change in form or appearance
  3. 6. the starting materials found in a chemical equation