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2. A gas like state of matter, formed at very high temperatures, that consists of high energy ions and free electrons
3. A physical combination of two or more substances in a changeable ratio.
4. The space enclosed or occupied by an object
7. A pure substance consisting of atoms of two or more elements that are chemically combined in a fixed ratio.
9. The force of gravity acting on the matter in an object
11. mixture A mixture that does not have a uniform appearance since the combined substances are unevenly distributed
12. The mass per unit volume of an object
13. The state of matter in which particles vibrate in fixed positions giving a substance a fixed shape and volume
16. The building block of all matter: consists of protons, electrons, and neutrons
18. A particle consisting of two or more atoms covalently bonded together

1. model of matter A model that states that all physical matter exists in the form of particles
5. The State of matter in which particles are close together but able to move around
6. A pure substance that consists of atoms with the same atomic number
8. substance A material made of only one kind of element or compound
10. The state of matter in which particles are far apart, move rapidly, and have little interaction with each other
11. mixture A mixture that has a uniform appearance throughout, also known as a solution, especially of a solid dissolved in a liquid
14. of definite proportions The law that states that the masses of chemical substances combine with in definite, characteristic integer ratios when forming compounds.
15. Anything that has mass and occupies space
17. The measure of the amount of matter in an object