Freshwater and Water Quality Review

Which number most accurately predicts the amount of oxygen that can be dissolved in water at 35(C)?

• 6

• 7

• 8

• 12

The table provides information about water conditions and trout survival. Which set of conditions would be best for the survival of trout?

• 5.5 mg/mL DO and pH of 8.0

• pH of 7.0 and temperature 30 C

• pH of 7.0 and temperature 22 C

• 6.0 mg/mL DO and pH of 5.5

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

NGSS.MS-LS1-5

The table lists some characteristics of a water sample collected from a river basin. Is this water sample a good source of potable water?

• Yes. The water sample is from a freshwater source.

• No. The water sample may still contain impurities.

• Yes. The water sample may be categorized as safe water.

• No. The water sample does not indicate the date it was collected.

Tags

NGSS.MS-PS1-2

What is the primary difference between the treatment processes for drinking water compared to wastewater?

• Treatment of drinking water does not involve the addition of chemicals.

• Wastewater treatment begins with water from lakes, rivers, or groundwater.

• Only drinking water goes through a sedimentation process.

• Once treated, wastewater is released into a waterway.

If all pollution must be caused by a source, how is it possible to have non-point source pollution?

• The pollution is transferred from place to place by water or air.

• There is only one source of the pollution that can be identified.

• The source cannot be identified or comes from many different unknown sites.

• The source of the pollution is not located in the same area as the polluted site.

Which example represents a point source of pollution?

• acid rain caused by exhaust from vehicles

• chemical runoff from lawns

• oil and gasoline discharged from cars

• heated water released from a power plant

The table shows the pH levels of water samples collected from different bodies of water in North Carolina. Which water sample is the purest ?

• Water Sample A

• Water Sample B

• Water Sample C

• Water Sample D

Tags

NGSS.MS-PS1-2

Which conditions indicate that a water system is healthy?

• high dissolved oxygen, low temperature, and high nitrates

• low dissolved oxygen, high temperature, and low nitrates

• low temperature, low dissolved oxygen, and high numbers of bioindicators

• high numbers of bioindicators, low temperature, and high dissolved oxygen

Which water quality indicator will be most impacted by burning fossil fuels and air pollution?

• nitrates
• pH (water will be more acidic)
• Dissolved oxygen
• turbidity

Tags

NGSS.MS-ESS3-3

Which beaker in the image has the highest turbidity?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-2