Matter

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Across
  1. 4. A change that can usually be reversed with energy.
  2. 5. A sign of a chemical change involving solid formation from liquids.
  3. 9. A mixture lacking uniformity in composition.
  4. 10. A pure substance made up of only one kind of atom.
  5. 11. The process of changing from liquid to gas.
  6. 13. This state change involves a substance changing from solid to liquid.
  7. 15. Characteristics that define each element, such as conductivity and state of matter.
  8. 19. The scientist who first proposed the concept of chemical elements.
  9. 20. The physical form of a mixture (solid, liquid, gas).
  10. 21. Charged particles produced by altering the electron-to-proton ratio.
Down
  1. 1. A change where new substances are formed.
  2. 2. The makeup of a mixture's components.
  3. 3. Atoms of the same element with different neutron counts.
  4. 6. The tendency of a substance to undergo chemical change.
  5. 7. The ability of a substance to dissolve in a substance.
  6. 8. A measure of mass per volume in a mixture.
  7. 12. A process that can produce heat and light, such as in fireworks.
  8. 14. The center of an atom, containing protons and neutrons.
  9. 15. Positively charged particles found in the nucleus of an atom.
  10. 16. A combination of substances not chemically bonded.
  11. 17. The process of a substance turning into gas.
  12. 18. The process of changing from solid to liquid.