Chemistry

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Across
  1. 2. two or more different types of atoms bonded together
  2. 3. ___________ oxide is another name for rust
  3. 4. two hydrogen atoms and one oxygen
  4. 5. the things that change in the experiment
  5. 7. group of bonded atoms
  6. 8. the letters that stand for iron on the periodic table
  7. 9. unit of an element
Down
  1. 1. data that uses observations
  2. 2. before adding variables to an experiment
  3. 6. basic type of chemical matter