VOCABULARY: Matter, Lessons 4-6

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Across
  1. 2. A ___ substance is a sample of matter, either a single element or a single compound, that has definite chemical and physical properties.
  2. 4. A substance that cannot be separated or broken down into simpler substances by chemical means
  3. 5. Change of state from a liquid to a solid
  4. 8. Change of state from a solid to a liquid
  5. 12. A charged particle that forms when an atom or group of atoms gains or loses one or more electrons
  6. 14. The smallest unit of an element that maintains the properties of that element
  7. 16. A combination of two or more substances that are not chemically combined
  8. 17. A process in which ions lose or gain electrons to become electrically neutral atoms
  9. 19. Change of state from a liquid to a gas (that usually occurs at the surface of a liquid over a wide range of temperatures)
  10. 21. The change of state from a gas to a liquid
  11. 22. Describes something that has a uniform structure or composition throughout
Down
  1. 1. The change of state directly from a solid to a gas
  2. 3. Describes something that does not have a uniform structure or composition throughout
  3. 6. A form of matter that does not have a definite volume or shape
  4. 7. The change of state directly from a gas to a solid
  5. 9. A process in which atoms lose or gain electrons to become electrically charged particles called ions
  6. 10. The state of matter in which the volume and shape of a substance are fixed
  7. 11. State of matter that forms when heat energy is added to a neutral gas, causing its atoms or molecules to lose electrons
  8. 13. The change of state from a liquid to a gas that occurs at a specific temperature
  9. 15. A subatomic particle that has a negative charge
  10. 18. A substance made up of atoms of two or more different elements joined by chemical bonds
  11. 20. The state of matter that has a definite volume but not a definite shape