Lab: Effects of Human Activity on Freshwater Resources

Question 1

Throughout the reflection, make sure you have a copy of the student guide, PDF or Word, and your data tables. Complete the paragraph using the drop-down menus. In this lab, you observed how pollutants affected the of water. You also modeled and observed how pollution affected freshwater sources, including surface water and the water in the .

Revolt · Accepted Answer

B: pH

Question 2

How do acids and bases affect the quality of freshwater sources?

Revolt · Accepted Answer

C: Acids lower the pH of freshwater and bases raise the pH of freshwater.

Question 3

Geraldo wants to model the effect of acids on the pH of water for a group of students. Which pollutant should Geraldo add to the water? What will the pH reading be after Geraldo adds the pollutant?

Revolt · Accepted Answer

B: pesticide

Question 4

Think about how acids and bases would affect the water quality in the two lakes.Which set of pH data would you expect to see based on your observations?

Revolt · Accepted Answer

B: Lake A: pH = 8.3; Lake B: pH = 3.7

Question 5

Compare the appearance and pH of the unfiltered and filtered polluted water. What conclusion can be made based on these observations?

Revolt · Accepted Answer

The filtered water is clearer than the unfiltered water, which appears cloudy and yellowish. However, the pH readings for both samples remain at levels that are unsafe for living organisms. This indicates that while filtration improved the water's appearance, it did not necessarily make the water safe or clean chemically. Therefore, the conclusion is that the quality of water cannot be determined by appearance alone.

Question 6

Which statements describe freshwater sources? Check all that apply.Rainwater can replace or replenish freshwater sources.Precipitation, such as rainwater, is the source of freshwater on Earth.When the amount of surface freshwater increases, so does the amount of groundwater.Human activity, such as taking a bath, may change the quality of a freshwater resource.Pollution in lakes does not affect groundwater because the ground acts as a barrier or filter.

Revolt · Accepted Answer

A: Rainwater can replace or replenish freshwater sources.; B: Precipitation, such as rainwater, is the source of freshwater on Earth.; C: When the amount of surface freshwater increases, so does the amount of groundwater.; D: Human activity, such as taking a bath, may change the quality of a freshwater resource.

Question 7

Which sources of nutrient pollution are mentioned and shown in the video? Check all that apply.construction materialsfarmslaundry detergentsmining wastespet wasteswater treatment plants

Revolt · Accepted Answer

B: farms; C: laundry detergents; E: pet wastes; F: water treatment plants

Question 8

Which statements describe turbidity? Check all that apply.

Revolt · Accepted Answer

A: Turbidity is a measure of water clarity.; B: Turbidity may be caused by sediments.; C: Turbidity may be a result of human activities.

Question 9

Which human activities would most likely increase turbidity? Check all that apply.

Revolt · Accepted Answer

A: cutting down trees; B: building roads in mountains; C: constructing buildings; E: removing sediments from sidewalks using water

Question 10

What can people do to lessen the effect of energy production on the pH of freshwater sources? Check all that apply.

Revolt · Accepted Answer

B: produce energy using water power; C: use electricity or energy-saving products; D: create technology to capture sulfur dioxide; E: use petroleum instead of coal to produce electricity

Lab: Effects of Human Activity on Freshwater Resources Answers

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