ISBS #1-12 p.50

1. A physical properties be observed and measured without changing the chemical makeup of the substance.
2. Water’s freezing point and melting point is 0 degrees Celsius, water’s density is 1.00 g/mL at 25 degrees Celsius, and water’s boiling point is 100 degrees Celsius.
3. The ice's density should be less because ice floats.
4. If you took some ice and put them in a bowl and boiled it at 100 degrees Celsius you could watch the water go from a solid to a liquid and then to a vapor through evaporation.
5. Heterogeneous mixtures can almost always be separated and have no completely formed into one unlike homogeneous mixtures, which are mixtures that are completely one.
6. The size of the particles in gasoline.
7. a) suspension b) suspension c) colloid d) solution e) suspension f) colloid
8. The air in the room is most likely a colloid because we would not be able to see the particles and the separation however if it were a solution the beam would stop at the window.
9. See drawing
10. This substance is a colloid. No particles gathered at the bottom; therefore, it cannot be a suspension and the Tyndall Effect was Negative because the beam passed through so it must not be a solution.
11. A substance is homogeneous, has a definite composition, and cannot physically be separated without a chemical reaction. Two examples of a substance are Hydrogen and water.
12. a) CO-compound b) Co-element c) HCl-compound d) Mg-element e) NaHCO3-compound f) NO-compound