Chemistry - Chapter 14 (MC #3)
Which federal agency regulates bottled water?
FDA
What percentage of public water supplies in the United States do NOT meet one or more of the EPA water standards?
10%
About ________ of the world's fresh water supply is used in agriculture.
70%
Which of the following statements about bottled drinking water is true? - Bottled water is healthier than tap water. - Bottled mineral water often contains more dissolved ions than tap water. - Bottled water is safer than tap water. - All bottled water comes from natural springs or artesian wells.
Bottled mineral water often contains more dissolved ions than tap water
The pHpH of rainwater is not 7.0 because atmospheric ______ dissolves in raindrops to form ______, which ______ the pH of rainwater.
CO2, Carbonic acid (H2CO3), lowers
Which treatment method is best at removing trihalomethanes such as chloroform?
Charcoal filtration
Which of the following uses the greatest amount of water in the United States? - public water supplies - cooling for electric power plants - industrial manufacturing - agricultural irrigation
Cooling for electric power plants
The major use of water in the United States is for public water supplies.
False
Which of these common human activities contribute to BOD? - paddling a boat across a lake or pond - fishing in a lake or pond - dumping detergents in a lake or pond - swimming in a lake or pond
Dumping detergents in a lake or pond
Which federal agency regulates drinking water standards from municipal water supplies?
EPA
The Clean Water Act has had no impact on water quality over the past two decades.
False
One of the advantages of treating sewage effluent with ozone as opposed to chlorine is
O3 is more effective in killing viruses
What substances remain in wastewater after effective secondary treatment?
Organic molecules, phosphates, nitrates
Which of the following processes is not used in a conventional method of water treatment? - percolation - phytoremediation - filtration - aeration
Percolation
Part complete Identify each of the following as a primary, secondary, or tertiary method of wastewater treatment. - Sand and Gravel filters - Reverse Osmosis - Settling Basin
Primary: Settling Basin Secondary: Sand and Gravel filters Tertiary: Reverse Osmosis
Identify the pros and cons of using bottled water.
Pros: - Safe and Convenient - Taste Cons: - Manufacturing requires petroleum and a lot of energy - Very expensive
Advanced treatment of wastewater can include any of the following EXCEPT - phytoremediation. - reverse osmosis. - sand and gravel filtration. - charcoal filtration.
Sand and gravel filtration
Consider the statement "BOD (biological oxygen demand) indirectly measures the levels of sewage in water, because microorganisms in sewage release oxygen into the water." Which of the following is true? - The statement is wrong, but the reason is correct. - The statement is correct, but the reason is wrong. - Both the statement and the reason are correct. - Neither the statement nor the reason is correct.
The statement is correct, but the reason is wrong
Secondary treatment of sewage involves
filtering and aeration.
Consumption of water with high levels of nitrate is particularly hazardous to
infants
Charcoal filtration of wastewater is an excellent method for the removal of
organic molecules.
