Chemical reaction

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Across
  1. 3. this Energy is used to break the bonds between the atoms
  2. 5. when heat is absorbed in during a chemical reaction
  3. 6. two or more substances joined together to make a new substance.
Down
  1. 1. a substance breaks down into simpler substance
  2. 2. when heat is given out during a chemical reaction
  3. 4. a substance gains oxygen during a chemical reaction
  4. 7. it cannot be created nor destroyed,only transferable