Physical Science Ch. 2 Matter

5. The mass per unit volume of an object,
7. The change in state directly from a solid to a gas without melting first.
8. The change in state directly from a gas to a solid without condensing first.
9. The relatively slow form of vaporization in which liquid particles obtain sufficient energy to change to the gaseous state through the random collisions of particles.
12. Anything that has mass and occupies space.
14. The building block of all matter.
17. The state of matter in which particles are far apart, move rapidly, and have little interaction with each other.
19. A pure substance consisting of atoms of two or more elements that are chemically combined in a fixed ratio.
20. The space enclosed or occupied by an object.
21. The changing of state from a liquid to a solid.
22. Mixture that does not have a uniform appearance since the combined substances are unevenly distributed.

1. Mixture that has a uniform appearance throughout, and is also known as a solution.
2. A gas-like state of matter, formed at very high temperatures, that consists of high-energy ions and free electrons.
3. The change of state from solid to liquid.
4. The change of state from a gas to a liquid.
6. The state of matter in which particles are close together but able to move around.
10. substance A material made of only one kind of element or compound.
11. The force of gravity acting on the matter in an object.
12. A physical combination of two or more substances in a changeable ratio.
13. The measure of the amount of matter in an object.
15. A particle consisting of two or more atoms covalently bonded together.
16. The change of state from a liquid to a gas.
18. The fast form of vaporization in which the energy within a liquid creates higher pressure within the liquid than the air pressure outside the liquid.
23. A pure substance that consists of atoms with the same atomic number.
24. The state of matter in which particles vibrate in fixed positions, and has a fixed shape and volume.