Science lesson 1-3

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Across
  1. 3. An object's ability to float is called
  2. 8. Petroleum is a complex mixture of
  3. 12. A(n) ? has north and south poles
  4. 15. As more matter gets packed into the same amount of space, the material's density
  5. 18. compounds can only be broken apart by
  6. 20. solids keep their
  7. 21. The tiny, very dense body in the atoms center is called the atomic
Down
  1. 1. Each ? has its own density
  2. 2. We call Mendeleyev's the periodic table after the periodic changes found in the element's
  3. 4. When heat is absorbed by a solid, the molecules vibrate
  4. 5. The basic building blocks of all matter are
  5. 6. one state of matter
  6. 7. Mass is often measure in
  7. 9. A formula contains numbers below the elements called
  8. 10. one state of matter
  9. 11. When water absorbs enough heat it turns into a(n)
  10. 13. Scientists write symbols for compounds called
  11. 14. A measure of how tightly packed matter is is called
  12. 16. A measure of the amount of matter in a object is
  13. 17. the number of ? in a atom determines what element it is
  14. 19. one state of matter