Unit 4 Sec. A and Sec. D Summary HW

7/23/14

Unit 4 Sec. A Summary HW

9)

10) Colloid because the mixture does not settle out.

13) a. 2.11%

b. 0.009%

14) Oceans, glaciers, rivers, and water vapor.

15) Water is a renewable source because it can be replenished by natural processes over time.  

16) Water constantly goes through a cycle and recycles all of the water so it can be possible that a dinosaur once swallowed the water.

Unit 4 Sec. D Summary HW

1) “Purify” water means processing the water making it clean.

2) Screenings, pre-chlorination, and flocculation.

3) Screening to prevent fish, sticks, and other large objects from entering the water, pre-chlorination which is adding chlorine to kill disease-causing organisms, and flocculation which is where crystals of aluminum added to remove suspended particles.

4) a. It would be difficult to remove the salt in the seawater because salt is soluble in water.

b. Distillation

5) 

6) Yes because the temperature in the water has increased causing global warming.

7) This quote means that the world is filled with water but very little of it is drinkable.

8) The water would not be recycled and fill up quickly.

11) Flocculation is when the crystals of aluminum hydroxide are added to remove suspended particles.

12) Calcium oxide is added to neutralize acidic water thus raising its pH to a proper level.

13) 1 ppm of fluoride is added to reduce tooth decay.

18) Chlorine kills disease-causing organisms making it cleaner.

19) Chlorine in water can react with organic compounds produced by decomposing animal and plant matter to form substances that can be harmful to human health.