Across
- 2. This comes from petroleum
- 6. Materials ______ as they get cooler
- 10. The basic building blocks of all matter are
- 12. When water absorbs enough heat, it turns into a ___ called steam
- 13. We know of how many elements
- 16. About 3/4 of the elements are
- 17. When a change of _____ occurs, the identity of the substance stays the same
- 18. Particles that contain more than one atom joined together are called
- 19. When the temperature of a material increases, its particles move ______
- 20. This takes the shape of their containers
- 21. The number of ____ in an atom determines what element it is
Down
- 1. A measure of how much space a sample of matter takes up
- 3. As more matter gets packed into the same amount of space, the material's density does what?
- 4. As long as conditions such as ____ do not change, the density of a substance does not change
- 5. The melting point is also called the freezing point
- 7. is made up of molecules that have different kinds of atoms joined together
- 8. When molecules are linked in organized positions, a _____ results
- 9. Solids keep their ___
- 11. A measure of the amount of matter in an object is?
- 14. Petroleum is a complex mixture of what?
- 15. Materials ____ as they get hotter