Environmental Chemistry Section 2.1

Question 1

Define Ozone Layer

Answer 1

Sheilds the Earth from damaging UV rays from the sun

Question 2

Define Water Quality

Answer 2

Determined by what it is used for;
1. Human drinking water
2. Recreation
3. Livestock drinking water
4. Irrigration
5. Protection of aquatic life

Question 3

Define Biological Indicators

Answer 3

Organisms that live in water help determine its quality

Question 4

How do you measure Chemicals

Answer 4

The concentration of chemical is measured in parts per million (ppm) or milligrams per litre (mg/L)

Question 5

Define Dissolved Oxygen

Answer 5

The amount of oxygen dissolved in a body of water depends on;
1. Water Temperature
2. Turbulence
3. Amount of Photosynthesis
4. # of organisms living in it

Question 6

Define Acidity

Answer 6

As the pH of a water system drops the diversity of plants and animals that can live in the water decreases

Question 7

Define Spring Acid Shock

Answer 7

When acid builds up in the snow and then is released into the waterways as the snow melts

Question 8

Define Measuring Toxicity

Answer 8

Different chemicals affect organisms in different ways

Question 9

What is LD50

Answer 9

Lethal Dose
The amount of a substance that will kill 50% of a population

Question 10

Define Heavy Metals

Answer 10

Metals that have densities greater than 5g/cm3
Ex; Copper, Lead, Zinc… Mercury