4.2 Describing Chemical Reactions

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Across
  1. 2. substances at the beginning of a reaction
  2. 5. when one element replaces another element in a compound
  3. 8. new substances after the reaction is complete
  4. 10. developed the principle of the law of conservation of mass
  5. 14. a way to show a chemical reaction using symbols
  6. 15. matter does not enter or leave
Down
  1. 1. compounds break down into simpler products
  2. 3. matter can enter or escape to the surroundings
  3. 4. two or more elements combine to make a more complex substance
  4. 6. an example of an open system
  5. 7. fuel cells react with oxygen to generate energy
  6. 9. a number placed in front of a chemical formula in an equation
  7. 11. to balance a chemical equation both sides of the equation must have the __ number of atoms
  8. 12. in a chemical reaction the arrow reads as ___
  9. 13. is not created or destroyed