ISAS #2 & Questions on P.22

ISAS

3) a. The manufacture of the filter paper is classified as indirect water use because water was a hidden part of the making of the filter paper.

    b. The premoistening of the sand and gravel is classified as direct water use because we added water to the sand and gravel and the amount of water added can be directly measured.

    c. The use of water to cool the distillation apparatus is classified as direct water use because the amount of water can be directly measured. 

4) To purify water means to filter the oil, sand, and filth out of water so that it's clear, colorless, odorless, and tasteless.  

5) Three techniques for purifying water are oil water separation, sand filtration, and charcoal adsorption. One additional way to purify water is by UV light. 

6) Oil, sand, and many substances that give water a bad taste, cloudy appearance or an odor was removed from the foul water sample. 

7) The procedure used to filter the foul water can't be used on ocean water because it contains salt which is a solute that dissolves in the solvent water. This makes it difficult to separate the salt from the water. Distillation would be necessary for further purification. 

Pg.22

1) Three water uses that you could do without are washing dishes, clothes, and watering the plants.

2) One activity that you could not do without is drinking water because humans become dehydrated from the sun and can become very ill. 

3) In showering, many Americans can reduce the amount of water they use because, if each American shortens his or her shower by a minute, we could be saving many gallons of water a day. Also, people could wash their cars less. 

4) One way I could impure water is by shortening my shower so I can save water to wash my puppy.