CWEA GRADE 4 TEST PART 2 EXAM
PREP QUESTIONS WITH CORRECT
ANSWERS/NEWEST UPDATE
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Terms in this set (339)
A substance which releases hydrogen
ions
when dissolved in water. Most acids
will dissolve
the common metals and will react
with a base to
Acid:
form a neutral salt and water. An acid
is the opposite
of an alkali, has a pH rating lower than
7.0,
will turn litmus paper red, and has a
sour taste.
, The quantitative capacity of water or a
water solution to neutralize an alkali
or base. It is
usually measured by titration with a
Acidity: standard solution
of sodium hydroxide, and is
expressed in
ppm or mg/L of its calcium carbonate
equivalent.
The difference between the readings
of an instrument and true value of
what is being
Accuracy:
measured, expressed as a percent of
full
instrument scale.
, A clear vertical space through the free
atmosphere, between the lowest
opening of any
pipe or faucet conveying water or
waste to a tank
plumbing fixture receptor or other
device, and the
flood level rim of the receptacle. An
air gap is used
to prevent cross connection between
a water treatment
device and a possible source of
wastewater,
thereby preventing a reverse flow of
Air Gap:
water from
the sewer into the water supply
system. Without
an air gap, such reverse flow could
occur due to
an increase in the pressure in the
sewer system
or the creation of a negative pressure
in the water
supply line. Local plumbing codes
usually require
the air gap to be twice the diameter
PREP QUESTIONS WITH CORRECT
ANSWERS/NEWEST UPDATE
Save
Terms in this set (339)
A substance which releases hydrogen
ions
when dissolved in water. Most acids
will dissolve
the common metals and will react
with a base to
Acid:
form a neutral salt and water. An acid
is the opposite
of an alkali, has a pH rating lower than
7.0,
will turn litmus paper red, and has a
sour taste.
, The quantitative capacity of water or a
water solution to neutralize an alkali
or base. It is
usually measured by titration with a
Acidity: standard solution
of sodium hydroxide, and is
expressed in
ppm or mg/L of its calcium carbonate
equivalent.
The difference between the readings
of an instrument and true value of
what is being
Accuracy:
measured, expressed as a percent of
full
instrument scale.
, A clear vertical space through the free
atmosphere, between the lowest
opening of any
pipe or faucet conveying water or
waste to a tank
plumbing fixture receptor or other
device, and the
flood level rim of the receptacle. An
air gap is used
to prevent cross connection between
a water treatment
device and a possible source of
wastewater,
thereby preventing a reverse flow of
Air Gap:
water from
the sewer into the water supply
system. Without
an air gap, such reverse flow could
occur due to
an increase in the pressure in the
sewer system
or the creation of a negative pressure
in the water
supply line. Local plumbing codes
usually require
the air gap to be twice the diameter
