HW #2

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The periodic table is a table of chemical elements arranged in order of atomic number usually in rows. The elements with similar atomic structures are in vertical columns.

1SAS #3, 4, 5, 6, 7

3. a) Manufature of the filter paper is indirect water use because you do not know the exactly how water is used and you do not know the amount of water used. b) Premoistening of the sand and gravel is direct water use because you use water to moisten it and it can be directly measured. c.) Using water to cool the distillation apparatus is direct water use because the amount of water used can be directly measured and you know exactly why and when the water was used without a doubt.

4. Purifying water means to clean it.

5. Three techniques for purifying water is oil-water separation, sand filtration, and charcoal adsorption.

6. In oil-water separation, the oil was removed from the top layer of the liquid. In the sand filtration step, the and filter collected the solid impurities too large to fit between the sand and gravel. In the charcoal adsorption step, the substances that gave the water bad taste, odor, or cloudy appearance was attracted and held to the surface.

7. a) It could not be suitable for drinking because this simple purification process int he foul-water lab only cleans water enough to wash your hands with. b)Additional purification steps needed are distillation and burning the water so the salt evaporates.

A.8 #1-4

1. I could live without washing my car, floors, and bathing.

2. I could not do without drinking water.

3. I could reduce my water use for showering because i take long showers and i can take faster ones.

4. a) I could use impure water to watering indoor plants. b) This can be taken from skipping a car wash.