Homework #4

 ISAS #3: 

3.

a. Manufacture of the filter paper would be classified as indirect water use. The materials needed to make the filter paper, and transference of the filter paper all involve the use of water. The manufacturing of the filter would be categorized as indirect water use.

b. Premoistening have the sand and gravel would be classified as direct water use. Since we physically moisten the sand and gravel measure the amounts of water that must be added to the gravel/sand mixture

c. Use of water to cool the distillation apparatus is classified as direct water use. Because water is used to actually reduce the temperature of the distillation apparatus, it is categorized as indirect water use.

4. To "purify" water is a process used to filter out bacteria, dirt, and other impurities. Purified water is classified as a filtrate. The process of filtration is complete once the water has been through the process of distillation.

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

6. In the first step of the investigation, oil-water separation, oil was removed from the murky, dirty, top of the foul water sample. Then, during the process of sand filtration, solids were removed, creating a more yellow than brownish color. From there, in charcoal adsorption and filtration, the color became much less translucent and the odor seemed to essentially disappear.

7.

a. Although the foul water experiment removed all impurities, when testing electrical conductivity, salt still remained in the purified sample.

b. To create drinkable seawater, one would need to differentiate the salt content from the water during the procedure of distillation. If you further purify the seawater, it would be suitable for consumption.

A.8 Page 22:

1. Running the sprinklers, washing the car, running the dishwasher.

2. Showering

3. By turning off the water while scrubbing the dishes and while you brush your teeth, it would immensely reduce the amount of water used around the house.

4.

a) You can use impure water when washing the car

b) One could then take that water and wash a mirror.