Chemical Reaction

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Across
  1. 3. matter can enter from or escape to the surroundings
  2. 5. photosynthesis is an example of an _________ _________
  3. 8. a number placed in front of a chemical formula in an equation
  4. 9. matter is not allowed to enter or leave
  5. 10. the ratio of elements in a compound
  6. 11. a burning candlelight can be an example of _________ _________
  7. 12. a solid that forms from solution during a chemical reaction
Down
  1. 1. the substances that undergo change in chemical reaction
  2. 2. burning is an example of a _______ _______
  3. 4. new substances formed by the reaction
  4. 6. melting is an example of a _______ _______
  5. 7. reactant + reactant → product + product
  6. 8. the study of matter and how matter changes