Science Unit Test

2. A change of matter in size, shape, or state that does not change the type of matter.
6. The process of separating the parts of a mixture by evaporation and condensation.
8. An electrically charged atom or molecule with unequal numbers of protons and electrons.
11. A mixture of substances that are blended so completely that the mixture looks the same everywhere.
14. A substance that forms ions when dissolved and that conducts electricity.
17. A substance that dissolves one or more other substances to form a solution.
20. A type of mixture in which the particles of one material are scattered through another and block the passage of light without settling out.
21. A substance that is formed by the chemical combination of two or more elements.

1. An original substance at the beginning of a chemicalreaction.
3. change A change of matter that occurs when atoms link together in a new way, creating a new substance different from the original substances.
4. A physical combination of two or more substances that are blended together without forming new substances.
5. A solution of a metal and at least one other solid which is often also a metal.
7. The process of changing directly from a solid to a gas without first becoming a liquid.
9. A substance that is dissolved by another substance to form a solution.
10. The particular temperature at which a substance changes state from a solid to a liquid.
11. The amount of a solute that will dissolve in a given amount of a solvent.
12. The expansion of matter caused by a change in heat.
13. A substance that tastes sour and turns blue litmus paper red.
15. A substance at the end of chemical reaction.
16. The contraction of matter caused by a change in heat.
18. point The temperature at which a substance changes state from a liquid to a gas.
19. The temperature at which a substance changes state from a liquid to a solid.