challenge it choice 1

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Across
  1. 3. when the substance changes
  2. 4. the links between atoms
  3. 5. subatomic particle responsible for combining atoms together to form a new substance
  4. 7. what are gases,liquids,solids
  5. 8. decreases the temp after a chemical reaction
Down
  1. 1. increases temp after chemical reaction
  2. 2. changes size of shape of substance
  3. 6. study of matter