Chemical Reaction Crossword

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Across
  1. 4. combination of multiple substances
  2. 6. a substance that speeds up a reaction
  3. 7. a reaction that releases energy
Down
  1. 1. matter that has specific properties
  2. 2. a proposed explanation based on an observation
  3. 3. a protein that speeds up a reaction
  4. 5. a reaction that requires energy