Across
- 4. petroleum is a complex mixture of
- 8. the number of elements known
- 9. when water absorbs enough heat it turns into
- 10. particles that contain more than just one atom joined together are called
- 11. the ability or tendency to float
- 13. the molecules of any substance are
- 16. the melting point is also called the
- 17. when heat is absorbed by a solid the molecules vibrate faster
- 18. every substance has it's own melting point and
- 19. scientists write symbols for compounds called
- 20. when a compound forms from elements changes occur in a way that the atoms are
Down
- 1. adding or removing heat makes substance change from one state to another state of matter
- 2. when heat is removed from a boiling substance it
- 3. the basic building blocks of all matter are
- 5. compounds can only be broken apart by
- 6. about 3/4 elements are
- 7. the smallest thing that makes up all elements
- 12. a formula contains numbers below the elements called
- 14. when a substance is melting or boiling its stays the same
- 15. one of the states of matter it is what water is made of