Science Thingy 4? I’ve lost count.

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Across
  1. 6. The simplest form of a substance, the building blocks of everything
  2. 8. An opaque homogeneous mixture
  3. 10. A state of matter in which a material’s atoms are free to move around and are spread thin; atoms spread out to occupy as much space as possible
  4. 12. A material’s tendency to be formed into a flat sheet without shattering in its solid state
  5. 13. A state of matter in which a material’s atoms are able to move around freely, but are still relatively packed together
  6. 14. A thing made from two or more simpler things are combined; e.g. Dihydrogen monoxide
  7. 15. A material’s tendency to combust
  8. 16. Any characteristic of a material capable of being observed without changing a substance’s composition
  9. 18. A heterogeneous mixture that segregates into layers over time
  10. 19. A change that happens when a substance reacts to form one or more new substances
  11. 20. The smallest particle of an element
Down
  1. 1. A mixture where the parts comprising it are evenly distributed and give the look of a single substance
  2. 2. A transparent homogeneous mixture formed when substances dissolve, usually in water
  3. 3. Matter that has the same composition no matter what
  4. 4. The ability to change a material’s composition
  5. 5. A material’s tendency to conduct heat or electric charges through it
  6. 7. Process that separates materials based on their particle sizes
  7. 9. A change that happens when properties of a material change, but it’s substances stay intact
  8. 11. A mixture in which the parts comprising it are sufficiently different from each other
  9. 17. A state of matter in which a material’s atoms are locked in place in a rigid structure; electrons can still move freely