Chapter 3 Water Characteristics
Solids, water hardness, pH and gases are ________ characteristics. A. physical B. legal C. required D. chemical
D. chemical
Dissolved solids are ______ and cannot be filtered out. A. out of solution B. in suspension C. incognito D. in solution
D. in solution
T/F The threshold odor number (TON) relates to the number of dilutions needed for the water to be tasteless.
False
T/F The state recommends 20 color units or less for a quality water.
False. 15 color units or less
T/F The terms mg/L and ppm are not interchangeable.
False. They are the same.
T/F Suspended solids in water cannot be filtered out.
False. They can be filtered
The State requires filtered water to be equal to or less than ______ turbidity units in at least 95% of the monthly samples. A. 0.003 B. 0.03 C. 0.3 D. 3.0
C. 0.3
The state recommends a TON of ____ or less. A. 1 B. 2 C. 3 D. 4
C. 3
An alkaline or basic solution has a pH greater than _____. A. 0 B. 6 C. 7 D. 14
C. 7
The Chemical symbol for water is ______. A. HO2 B. O2H C. H2O D. OH2
C. H2O
T/F Examples of inorganic matter found in water include rock, sand, metals and minerals.
True
One part per million or 1 mg/L means that for every ________ pounds of water there is one pound of material in it. A. 1,000,000 B. 100,000 C. 10,000 D. 1,000
A. 1,000,000
Consumers want drinking water to be palatable(___________) and have little or no odor. A. good tasting B. economical C.odorless D. cloudy
A. good tasting
True color is dissolved in water, and it cannot be removed by______. A. electrolysis B. filtration C. evaporation D. percolation
B. filtration
Nature's way of recycling our water is a process called the ______ cycle. A. hydroelectric B. hydrologic C. hydrated D. geological
B. hydrologic
Excessive calcium and ______ are the primary causes of hardness in water. A. iron B. magnesium C. manganese D. aluminum
B. magnesium
Precipitation that trickles into the ground recharging ______ is called percolation. A. rivers B. lakes C. surface water D. aquifers
D. aquifers
There are 3 common gases found in water; methane, carbon dioxide, and ______. A. hydrogen B. helium C. carbon monoxide D. hydrogen sulfide
D. hydrogen sulfide
T/F pH is the concentration of the hydrogen ion on a scale of 1 to 14.
False. 0 to 14
T/F The State recommends a maximum total dissolved solids content of 500 mg/L.
False. 1000 mg/L
T/F The state recommends a water pH of less than 7 be maintained at all times.
False. Slightly over 7
T/F Examples of organic matter found in water include bacteria, viruses, and protozoa.
True
T/F Taste and odor can come from organisms such as vegetation, bacteria, and algae, and from certain chemicals and metals.
True
T/F The deeper the well, the warmer the water
True
T/F The physical characteristics of water are color, taste, odor, temperature, and turbidity.
True
T/F The red color caused by iron is an example of suspended or apparent color and it can be removed by filtration
True
T/F There are 2 hydrogen atoms and 1 oxygen atom in each water molecule.
True
T/F Turbidity is the amount of suspended matter in water and causes the water to be cloudy.
True
T/F Turbidity must be limited because it shelters and nourishes bacteria and interferes with disinfection.
True
T/F Water is called the universal solvent and is not found pure in nature.
True
