Michael Graham science tic tac toe--types of reactions and chemical reactions crossword puzzle

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Across
  1. 2. total mass of the reactants equals total mass of the _______
  2. 5. equation using formulas and symbols instead of words to represent a chemical reaction
  3. 7. a reaction where energy is absorbed
  4. 8. most decomposition reactions require ____.
  5. 9. during a chemical reaction, matter is not ____ or destroyed
  6. 10. matter can enter from or escape to the surroundings
  7. 12. AC-->A+C
  8. 15. AB+CD-->AD+CB
  9. 17. a number that indicates the ratio of elements in a compound
Down
  1. 1. a reaction where energy is released
  2. 3. occurs when a substance reacts with oxygen to produce energy in the form of heat or light
  3. 4. matter is not allowed to enter or leave
  4. 5. symbols and numbers that represents atoms
  5. 6. total mass of the _____ equals total mass of the products
  6. 9. a number in front of the element
  7. 11. A+BC-->AC+B
  8. 13. A+B-->AB
  9. 14. what the arrow means
  10. 16. during a chemical reaction, matter is not created or _____