Chemical Reactions

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Across
  1. 3. the relative size of things
  2. 4. the tiny pieces that all matter is made of
  3. 6. a process in which atoms rearrange to form new substances
  4. 8. to change the order or position of something
Down
  1. 1. an object or diagram that helps us understand something by making it simpler
  2. 2. a starting substance that is part of a chemical reaction
  3. 3. something that is made of all the same atoms or groups of atoms
  4. 5. something that can be observed about a substance
  5. 7. an ending substance that is made during a chemical reaction