SCIENCE

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Across
  1. 3. Smallest unit of matter that retains the properties of an element
  2. 6. A change of state of matter from a liquid to a solid by the loss of heat
  3. 9. A combination of two or more substances that are not chemically combined
  4. 10. Temperature at which a solid becomes a liquid
  5. 13. A negatively charged ion
  6. 14. A positively charged ion
  7. 15. Describes something that has a uniform structure or composition throughout
  8. 17. A state of matter that has a definite volume but no definite shape.
  9. 18. A form of matter that has a definite shape and volume
Down
  1. 1. A positively charged particle in the nucleus of an atom
  2. 2. A mixture that is not uniform throughout
  3. 4. A pure substance made of only one kind of atom
  4. 5. The change of a liquid to a gas
  5. 7. A subatomic particle that has no charge and that is found in the nucleus of an atom
  6. 8. A substance made up of atoms of two or more different elements joined by chemical bonds
  7. 11. A substance with a pH above 7
  8. 12. A mixture that forms when one substance dissolves another
  9. 13. A substance with a pH below 7
  10. 16. A state of matter with no definite shape or volume