Unit 1 SBS #1-12 (pg. 50)

1. A physical property is a property that can be observed or measured without changing the chemical makeup of the substance. 

2. a. Density
    b. Freezing point
    c. Boiling point
    d. Melting point

3. The density of solid water (ice) has a lighter density that that of liquid water. 

4. In Antarctica, you can find water as a liquid (in the ocean), water as a solid (the glacier and ice), and water is a gas (clouds). 

5. Heterogeneous mixtures are different from homogeneous mixtures because heterogeneous mixtures don't have the same concentration throughout while homogeneous mixtures do. 

6. To know which layer would be on top between gasoline and water, you would have to know the density of the 2 liquids. 

7. a. colloid
    b. colloid
    c. solution
    d. solution
    e. suspension
    f. colloid

8. The air in the room would be a colloid because, since the light is showing through the windows, the Tyndall effect is taking place, making the a air a colloid.

9.  

10. The liquid would be a colloid because there is a light seen as it passed through the mixture and no particles settle to the bottom, making the liquid a colloid mixture. 

11. A substance is a material with a uniform, a definite composition, and distinct properties. 2 examples of substances are elements and compounds.

12. a. Compound

      b. Element

      c. Compound

      d. Element

      e. Compound

      f. Compound

      g. Element