Exam #3 Prep Flashcards Preview

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Flashcards in Exam #3 Prep Deck (23):
1

A polar covalent bond is created when...

two atoms share their bonding electrons unequally

2

What are trihalomethanes?

chemical compounds in which three of the four hydrogen atoms of methane (CH4) are replaced by halogen atoms (halogen atoms: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At))

3

Which of the following has the highest MCL in drinking water in the US?

nitrates

4

What is reverse osmosis used for?

to remove dissolved salts from sea water

5

The correct name for CuO is

copper (II) oxide

6

What is electronegativity?

a measure of an atom's attraction for an electron in a chemical bond

7

What is biological oxygen demand (BOD)?

A measure of the amount of dissolved oxygen microorganisms use up as they decompose organic wastes found in water

8

The EPA regulates the presence of nitrates and nitrites in water because...

they interact with the blood and limit its ability to transport oxygen

9

Most polyatomic ions...

have a negative charge

10

The main reason that water supplies are "chlorinated" is...

to kill disease-causing organisms in the water

11

The fact that carbon (C) is less electronegative than nitrogen (N) means that in a C Picture N bond, the...

shared electrons are closer to the N atom than to the C atom

12

If the lead concentration in water is 1 ppm, then we should be able to recover 1 mg of lead from ____ L of water.

1

13

How many joules are required to heat 2.0 L of water from 20°C to its boiling point of 100°C? The specific heat of water is 4.18 J/g•°C and the density of water is 1 g/mL.

6.7 × 10^5 J

14

When table sugar (sucrose, C12H22O11) dissolves in water, which type(s) of attraction between water and sugar molecules occur(s)?

hydrogen bond
polar-polar interactions

15

A student wants to prepare exactly 250 mL of a 0.500 M aqueous potassium hydroxide solution. What mass of potassium hydroxide (molar mass = 56.10 g/mol) must the student dissolve in the 250 mL of solution?

7.01g

16

The annual radiation dose for most citizens of the United States is between...

0 to 0.10 Sv

17

Most high-level nuclear waste in the United States is currently....

sealed at the sites where it was produced

18

The greatest percentage of background radiation comes from...

naturally occurring radon

19

Is nuclear power generation associated with producing greenhouse gases?

Yes, but from obtaining the fuel.

20

Thermal pollution is possible at water sources near

both coal-burning and nuclear plants

21

What is vitrification?

Spent fuel elements or other mixed waste are encased in ceramic or glass

22

Rank the forms of nuclear radiation from highest to lowest mass

alpha, beta, gamma

23

Which is not true of radioactive half-life? Radioactive half-life is...

increased by heating the isotope