Formulae | Quiz 2

Question 1

Formula for molarity?

Answer 1

c = n/v where c is concentration in mol/L, n is # of moles, and v is volume in litres

Question 2

Molarity is also known as

Answer 2

molar concentration

Question 3

Practical applications of the molarity formula:

Answer 3

in soap, food industry, hot chocolate, iced tea, medicine, etc

Question 4

Formula of mass-volume concentration:

Answer 4

c = m/v where c is concentration in g/L, m is mass of solute in g, and v is volume of solution in L

Question 5

Liters can also be expressed in

Answer 5

dm^3

Question 6

Mass-volume concentration can be used when

Answer 6

the solution has a solid solute and a liquid solvent

Question 7

Formula for %(mass/volume) concentration:

Answer 7

mass of solute (in g) / volume of solution in mL all * 100%

Question 8

Formula for %(mass/mass) concentration:

Answer 8

mass of solute (in g) / mass of solution (in g) all * 100

Question 9

Formula for % volume/volume concentration:

Answer 9

volume of solute (in mL) / volume of solution (in mL) all * 100

Question 10

Mass/mass concentration is used when

Answer 10

solutions are solid or liquid

Question 11

Mass/mass concentration applications in real life include

Answer 11

IV, personal care, spinal fluid, CaCl2 and slush, drugs, toothpaste

Question 12

Volume/volume concentration is used when

Answer 12

both chemicals are liquid

Question 13

Volume/volume concentration applications in real life include

Answer 13

Diluting acids, alcohol

Question 14

Formula for trace concentrations (ppm, ppb, ppt):

Answer 14

mass of solute/mass of solution all * 10^6/9/12/etc

Question 15

Trace concentration is used to

Answer 15

find small amounts of things (in water, medication, etc.)

Question 16

Formula for density is:

Answer 16

d = m/v

Question 17

Derive moles from density via:

Answer 17

d = PM/RT

Question 18

High pressure outside, low pressure inside =

Answer 18

thing gets crushed (can)

Question 19

High pressure inside, low pressure outside =

Answer 19

attempt to balance out (ears pop)

Question 20

Why does the human body not crumple from high pressure?

Answer 20

Skeletal system

Question 21

Bernoulli’s principle:

Answer 21

As speed of a moving fluid (liquid/gas) increases, pressure within fluid decreases

Question 22

Pressure formula:

Answer 22

Pressure (total) = pressure (partial a) + pressure (partial b)

Question 23

The ideal gas model assumes:

Answer 23

That gases are in constant, random, straight-line motion; attraction between particles is negligible; volume of particles is negligible; no energy is lost on collision; average kinetic energy is directly proportional to temperature

Question 24

Under STP, one mole of gas will always take up how many litres of volume?

Answer 24

22.7

Question 24

Pressure is determined by

Answer 24

how frequently the particles collide with the container

Question 25

Molar volume formula:

Answer 25

V = M/d (molar volume = molar mass / density)