How Can I Make New Stuff From Old Stuff?

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Across
  1. 3. when atoms do not enter or leave the system
  2. 4. when two or more substances have an effect upon one another
  3. 5. substance made by a chemical reaction
  4. 7. rainwater that has certain substances mixed in as factories burn coal
  5. 9. starting substance in a chemical reaction
Down
  1. 1. the amount of space something takes up
  2. 2. the amount of matter in a substance
  3. 3. a test where only one variable is changed at a time
  4. 6. the mass in a set volume of a substance
  5. 8. an independent variable