Environmental Chemistry topic 2

Environmental Chemistry topic 2

Science 8/9 Review

Important Topics we discussed

• Monitoring Water Quality

• Monitoring Air Quality

• Monitoring the Atmosphere

Part 1: Monitoring Water Quality

Review

Topics

• Uses of water

• Water Monitoring

• Parts Per Million (ppm)

• What to measure

• Dissolved oxygen and what affects it

• Biological indicators

• LD50 and Heavy Metals

Poll

Which of these does not belong in the categories we measure for in water?

• Human Drinking Water

• Clarity

• Recreation such as swimming

• Livestock drinking water

• Irrigation

Multiple Choice

From the list before which of the categories was missing?

• Invertebrates

• Protection of aquatic life

• Quality

Open Ended

State one thing that is measured in water quality?

What we Measure

• Dissolved oxygen

• Biological indicators

• Plant nutrients such as nitrogen and phosphorus

• Acidity

• Pesticides

• Heavy Metals

• Salts such as sodium chloride and magnesium sulfate

Multiple Choice

Is essential for the health of aquatic life such as fish, insects, and micro-organisms

• Heavy Metals

• Dissolved Oxygen

• Acidity

• Biological Indicators

Fill in the Blanks

(Blank) milligrams per litre (equal to 5ppm) of dissolved oxygen will support most organisms that live in lakes and streams.

Open Ended

State one factor that affects the level of dissolved oxygen?

Open Ended

Why do scientists use biological indicators to monitor water quality?

Fill in the Blanks

(blank) are type of biological indicator of water quality that does not cause illness themselves but shows the effects of pollution

Multiple Choice

If the pH of water in an aquatic environment is below 5.0 what will you see?

• No aquatic life

• Not many fish especially young ones

• Nothing

• Plenty of aquatic life

Multiple Select

Too much nitrogen or phosphorus in the water can affect dissolved oxygen in water, what does this cause? Select all that apply

• large growth of algae that grows too fast for the ecosystems can handle and leads to algae blooms

• illness in fish

• death of large numbers of fish

• Increase in fish and aquatic life

• Increases the amount of dissolved oxygen

Fill in the Blanks

Toxicity describes how (blank) a substance is

Multiple Choice

The level of toxicity is measured by its

• Acidity

• Quality number

• Toxic level number

• LD50 number

Multiple Select

What is true about LD50? (Select all that apply)

• The lower the number the more toxic it is

• LD= "Lethal Dose"

• The higher the number the more toxic

• is 50% of a test group that dies from a specific dose of that substance

• Usually received by mouth or skin contact

Open Ended

Mercury in water levels causes sickening diseases that affects people who eat fish high in mercury. Mercury is in what category?