Gr. 9 Environmental Chemistry Topic 3 Review

Which of the following are indicators of healthy water systems?

• high nitrates, high pH, and low temperatures
• low temperatures, high dissolved oxygen, and neutral pH

A measure of the amount of dissolved salts in a given amount of liquid

• salinity
• bio-indicators
• wave
• tide

Water with high turbidity 

• is cloudy and hard to see through
• is clear

Under which condition are large numbers of fish in a lake likely to die?

• when the water's dissolved oxygen is low and temperature is high
• right after a storm with heavy rainfall

Potable water is water that is ______________.

• polluted

• safe to drink

• biological

The pH of healthy water is _______________.

• 0-5

• 6.5-8.5

• 9-14

Sewage is a source of which pollutant?

• nitrates

• phosphates

• algae

Cleaning and industrial waste are sources of which pollutant?

• nitrates

• phosphates

• salinity

High concentrations of salinity can cause vegetation to become unhealthy or die and can lead to a/an ___________ in biodiversity

• decrease

• increase

_______________ water quality is indicated by a few number of bio-indicator organisms in one place

• Poor

• Good