Chapter 2: Calculations Used in Analytical Chemistry

Question 1

is a non-SI unit of length that is widely used to express the wavelength of very short radiation such as X-rays

Answer 1

Angstrom

Question 2

What does SI stand for

Answer 2

International System of Units

Question 3

SI is the initialism for the French acronym, which stands for

Answer 3

Systeme International d’Unites

Question 4

Four of the seven SI base units, kg, ampere, kelvin, and mole were redefined by setting exact values for

Answer 4

Planck’s constant
elementary electric charge
boltzmann’s constnt
avogadro’s constant

Question 6

is an unchanging measure of the quantity of matter in an object.

Answer 6

Mass

Question 7

is the force of attraction between an object and its surroundings, principally Earth

Answer 7

Weight

Question 8

is used to compare the mass of an object with the mass of one or more standard masses.

Answer 8

balance

Question 9

process of comparing masses is usually called

Answer 9

weighing

Question 10

the objects of known mass as well as the results of weighing are frequently called

Answer 10

weights

Question 11

we use ______ for the act of determining the mass of an object

Answer 11

Balance

Question 12

We often say _________ to mean the standard masses used in weighing.

Answer 12

weights

Question 13

is the SI unit for the amount of a chemical substance

Answer 13

mole (abbreviated mol)

Question 14

one mole contains

Answer 14

6.022x10^23 elementary entities (molecules, particles, ions, atoms, electrons, etc.)

Question 15

It is the substance’s mass in grams of 1 mole of that substance

Answer 15

molar mass

Question 16

is 1/1000 of a mole

Answer 16

millimole

Question 17

mass in grams of a millimole, is likewise 1/1000 of the molar mass is called

Answer 17

millimolar mass

Question 18

other terms of dimensional analysis

Answer 18

factor-label method
picket fence method

Question 19

of a solution of a solute species X is the number of moles of that species that is contained in 1 L of the solution (not 1 L of the solvent).

Answer 19

molar concentration Cx

Question 20

is the molar concentration of a
particular species in a solution.

Answer 20

Molar equilibrium concentration

Question 21

is a convenient way to express concentration

Answer 21

parts per million

Question 22

formula of ppm

Answer 22

mass of solute/ mass of solution x 10^6 ppm

Question 23

formula of weight percent

Answer 23

weight of solute/ weight of solution x 100

Question 24

formula of volume percent

Answer 24

volume solute/ volume of solution x 100

Question 25

formula of weight/volume percent

Answer 25

weight solute/ volume of solx 100

Question 26

formula for ppb

Answer 26

mass of solute/mass of solutionx 10^9

mg/L

Question 27

The _________ of a substance is its mass per unit volume,

Answer 27

density

Question 28

is the ratio of its mass to the mass of an equal volume of water at 4°C.

Answer 28

specific gravity

Question 29

expresses the mass of a
substance per unit volume. In SI
units, density is expressed in units of
kg/L or alternatively g/mL.

Answer 29

density

Question 30

is the ratio of the
mass of a substance to the mass of an
equal volume of water.

Answer 30

specific gravity

Question 31

gives the simplest whole-number ratio of atoms in a chemical compound

Answer 31

empirical formula

Question 32

specifies the number of atoms in a molecule.

Answer 32

molecular formula

Question 33

The ___________ of a reaction
is the relationship among the
number of moles of reactants
and products as represented by a
balanced chemical equation.

Answer 33

stoichiometry