Unit 4 Review 2

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Across
  1. 2. - A unexpected change in this can indicate a chemical reaction.
  2. 5. - Two or more atoms bonded together.
  3. 9. - Changes that affect the form but not the identity of a substance.
  4. 10. - A process where substances change into new substances.
  5. 11. Changes that create a new substance
  6. 13. - The connection between atoms in a molecule.
  7. 15. - A chemical reaction that releases heat and light.
  8. 16. - The physical form of matter (solid, liquid, gas).
Down
  1. 1. - A physical combination of substances that can be separated and are not chemically combined..
  2. 2. - A physical change where gas becomes liquid.
  3. 3. - A physical change where a liquid becomes a solid.
  4. 4. - A physical change where a liquid turns to gas.
  5. 6. - A physical change where a solid becomes a liquid.
  6. 7. - What happens to bonds in a chemical reaction.
  7. 8. - Formation of this may indicate a chemical change.
  8. 12. - A result of a chemical change involving iron and oxygen.
  9. 14. - A physical change when a substance mixes into a liquid.