Chemical Reaction

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