Chemistry

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Across
  1. 4. substance has constant composition and has not been changed
  2. 7. Any change that occurs without altering the chemical composition
  3. 8. the basic unit of a chemical element and extremely small
  4. 9. states that mass is neither created or distroyed
  5. 10. substances present in a chemical reaction that are consumed during the reaction to make
Down
  1. 1. substance that is formed when two or more chemicals react
  2. 2. a change that cannot be reversed
  3. 3. a column of elements
  4. 5. horizontal row of the periodic table, there are seven
  5. 6. the process of changing from a liquid to vapor