topic 7

Question 1

Any physical, biological, or
chemical change in water
quality that adversely affects
living organisms or makes water
unsuitable for desired uses

Answer 1

water pollution

Question 2

MAJOR CATEGORIES OF WATER POLLUTATNTS

Answer 2

INFECTIOUS AGENT
ORGANIC CHEMICALS
INORGANIC CHEMICALS

Question 3

RADIOACTIVE MATERIALS
PRODUCTION, NATURAL SOURCES

Answer 3

Uranium, thorium, cesium,
iodine, radon

Question 4

The most serious water
pollutants in terms of human
health worldwide
- At least 25 million deaths each
year are blamed on these
water-related diseases

Answer 4

Pathogenic Organisms

Question 5

amount of
dissolved oxygen that must be
present in water in order for
microorganisms to decompose
the organic matter in the water

Answer 5

Biochemical oxygen demand
(BOD)

Question 6

uses a strong oxidizing agent
(dichromateion in 50% sulfuric
acid) to completely breakdown
all organic matter in a water
sample

Answer 6

Chemical oxygen demand (COD)

Question 7

rivers and
lakes that have clear water and
low biological productivity

Answer 7

Oligotrophic

Question 8

waters that are
rich in organisms and organic
materials. Eutrophication is an
increase in nutrient levels and
biological productivity

Answer 8

Eutrophic

Question 9

the water
is passed through fine filters or
membranes to screen out
dissolved impurities

Answer 9

FILTRATION

Question 10

involves heating or
boiling water full of dissolved
minerals

Answer 10

DISTILLATION

Question 11

means finding
remedies for problems.

Answer 11

REMEDIATION