8 EW Ch 2 Freshwater Resources

Pure water is neutral, meaning it is neither an acid nor a base. Pure water has a pH of

• 0
• 14
• 7
• 10

The amount of one substance in a certain volume of another substance is its

• concentration.
• coagulation.
• filtration.
• desalination.

The pH of water is a measure of its

• saltiness.
• acidity.
• color.
• cloudiness.

The process of obtaining fresh water from salt water is called

• desalination.
• filtration.
• conservation.
• coagulation.

Using less water so that it will not be used up is called

• desalination.
• distribution.
• conservation.
• irrigation.

Which of the following is a way to conserve water?

• taking longer showers
• reusing water in a factory to cool hot machinery
• letting the water run while you brush your teeth
• using open ditches to carry water for irrigation

The first step in treating water from a river or lake is usually

• chlorination.
• coagulation.
• concentration.
• filtration.

Why might chlorine be added to drinking water?

• Chlorine improves the taste of water.
• Chlorine softens hard water.
• Chlorine kills disease-causing microorganisms.
• Chlorine prevents water from becoming cloudy.

What enables water to move through a system of pipes?

• hardness
• water pressure
• pH
• water quality

In many communities, a network of pipes called sanitary sewers carries sewage away to

• wastewater treatment plants.
• desalination plants.
• irrigation systems.
• hydroelectric power plants.