1. Vigorously boiling water for one minute will kill any disease-causing microorganisms.
True
False

2. Boiling water as a purification method is best used in emergencies.
True
False

3. Boiling water can concentrate contaminants (such as lead, asbestos, mercury, and many toxic organic chemicals) that do not vaporize.
True
False

4. Distillation does not purify water.
True
False

5. Distillation is the reverse of boiling.
True
False

6. During distillation, water is boiled causing the pure (or mostly pure) steam to vaporize leaving the non-volatile contaminants behind, and the steam is then cooled until it condenses, and the resulting distillate drips into a containers.
True
False

7. Distillation does not kill most parasites.
True
False

8. Reverse osmosis is a type of water purification.
True
False

9. During reverse osmosis, water pressure is used to force water molecules through a membrane leaving the contaminants behind. Purified water is collected from the "clean" side of the membrane, and water containing the concentrated contaminants if flushed down the drain from the "contaminated" side.
True
False

10. Microscopic parasites (except viruses) are usually removed by reverse osmosis.
True
False

11. During air stripping, water flows down through a tube while a mechanical blower pumps air up the tube: Volatile organic compounds are transferred from the water to the air and then vented outside.
True
False

12. Water softening is also called “ion exchange”.
True
False

13. Contaminants removed by ion exchange include calcium, barium, radium, and taste-, odor-, and color-producing chemicals.
True
False

14. Chemical treatment of water can be used in emergencies to disinfect water.
True
False

15. The following are sometimes used in emergency chemical treatment of water: Common household bleach (chlorine), high-test granular calcium hypochlorite, chlorine tablets, common household iodine, and commercially prepared iodine tablets.
True
False

16. Chlorination can treat bacteria, other microbiological contamination, and taste-, odor-, and color-producing chemicals.
True
False

17. Chlorine is toxic.
True
False

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