Science Unit Test

3. A substance that forms ions when dissolved and that conducts electricity.
5. The process of changing directly from a solid to a gas without first becoming a liquid.
7. A change of matter that occurs when atoms link together in a new way, creating a new substance different from the original substances.
8. A change of matter in size, shape, or state that does not change the type of matter.
9. A substance that is formed by the chemical combination of two or more elements.
11. The amount of a solute that will dissolve in a given amount of a solvent.
12. An original substance at the beginning of a chemicalreaction.
17. The temperature at which a substance changes state from a liquid to a gas.
19. A substance that is dissolved by another substance to form a solution.
21. A mixture of substances that are blended so completely that the mixture looks the same everywhere.
22. A substance that tastes sour and turns blue litmus paper red.

1. The expansion of matter caused by a change in heat.
2. The particular temperature at which a substance changes state from a solid to a liquid.
4. The contraction of matter caused by a change in heat.
6. An electrically charged atom or molecule with unequal numbers of protons and electrons.
10. The temperature at which a substance changes state from a liquid to a solid.
13. A solution of a metal and at least one other solid which is often also a metal.
14. The process of separating the parts of a mixture by evaporation and condensation.
15. A substance that dissolves one or more other substances to form a solution.
16. A type of mixture in which the particles of one material are scattered through another and block the passage of light without settling out.
18. A substance at the end of chemical reaction.
20. A physical combination of two or more substances that are blended together without forming new substances.