Chemical Bonds

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Across
  1. 2. a process in which one or more substances are converted to one or more different substances
  2. 3. a chemical reaction that takes in energy from the surroundings.
  3. 5. an electron that 'lives' in the last electron shell
  4. 7. a change that changes the identity of the matter
  5. 10. groups of atoms held together by chemical bonds.
  6. 11. the smallest building blocks of matter that determine the identity of the elements.
Down
  1. 1. a formula that tells you have many elements and atoms are in a substance.
  2. 4. chemical reaction where the substances reacting release energy as heat
  3. 6. used to break bonds in reactants
  4. 8. the links between atoms in a substance that determine its identity.
  5. 9. a subatomic particle that's negatively charged