Melvin 2.1 vocab

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Across
  1. 4. the substances present before chemical reaction
  2. 5. absorbs heat energy
  3. 6. the energy is store in bonds
Down
  1. 1. a change in matter
  2. 2. material that has mass
  3. 3. substances that are formed
  4. 5. gives off thermal energy
  5. 6. a chemical reaction