Chemistry

Question 1

what equation can you use when trying to find the volume or concentration of a substance?

Accepted Answer

C1V1 = C2V2

Question 2

what is the equivalent weight of calcium carbonate (CaCO3)?

Accepted Answer

50 mg/meq

Question 3

how do you find the hardness given the concentration of either magnesium or calcium (in terms of mg/L CaCO3)?

Accepted Answer

find meq of calcium/magnesium and multiply by the equivalent weight of CaCO3

Question 4

what does [H+] represent?

Accepted Answer

acid concentration

Question 5

what does [OH-] represent?

Accepted Answer

base concentration

Question 6

what is [H+]*[OH-] equal to?

Accepted Answer

10^-14

Question 7

what is pH + pOH equal to?

Accepted Answer

14

Question 8

what are pH and pOH equal to?

Accepted Answer

pH = -log[H+], pOH = -log[OH-]

Question 9

what does anoxic mean?

Accepted Answer

absence of free oxygen but presence of bound oxygen (oxygen-containing compounds)

Question 10

what does the atomic number represent?

Accepted Answer

number of protons in the nucleus of an atom

Question 11

what are isotopes?

Accepted Answer

chemically identical forms of an element with same atomic number

Question 12

for water and pure solids, what is the activity equal to?

Accepted Answer

1

Question 13

what does half life represent?

Accepted Answer

time required for the concentration to decay to half its original value

Question 14

what is henry's law?

Accepted Answer

amount of dissolved gas in a liquid is proportional to its partial pressure above the liquid

Question 15

near neutral pH, which chemical species dominates in alkalinity?

Accepted Answer

bicarbonate (HCO3-)

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