Changes to Matter

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Across
  1. 3. Gas ______ are a sign of a chemical reaction.
  2. 5. Hydrogen is an example of an element.
  3. 7. In a ________ change, a new substance is formed.
  4. 10. A _______ is a combination of at least two atoms.
  5. 13. The most common element in the atmosphere is _________.
  6. 14. Earth's _____ is made mostly of oxygen and silicon.
  7. 15. A pencil breaking is an example of a ______ change.
  8. 17. In a chemical change, a ____ substance is formed.
Down
  1. 1. In a chemical change, a new ________ is formed.
  2. 2. A substance made of one thing is called a _____ substance.
  3. 4. A solid formed by two liquids in a chemical reaction.
  4. 6. The two most common elements on Earth's crust are ______ and silicon.
  5. 8. Nitrogen is the most common element in the _________.
  6. 9. A pure _______ is made of just one thing.
  7. 11. A _______ is a molecule with more than one type of element.
  8. 12. The element He on the Periodic Table
  9. 16. The two most common elements on Earth's crust are oxygen and _______.