Unit 3

Question 1

molar mass

Answer 1

mass in grams of 1 mol of any substance

Question 2

atomic weight (A.W.)

Answer 2

a mol of atoms

Question 3

molecular weight (M.W)

Answer 3

for covalent molecules (g/mol)

Question 4

formula weight (F.W.)

Answer 4

for formula units of ionic compounds (g/mol)

Question 5

The set of empirical molar coefficients

Answer 5

the stoichiometry of any balanced equation

Question 6

Law of mass conservation

Answer 6

states that the mass of reactants = mass of products

Question 7

precision

Answer 7

2 measurements compared (are they the same?)

Question 8

accuracy

Answer 8

compare to a true value

Question 9

±5% rule

Answer 9

states that if 2 numbers are within ±5% of each other, then they are statistically the same

Question 10

A pop test signifies a presence of…

Answer 10

hydrogen

Question 11

complete ionic equations

Answer 11

require that all strong electrolytes be written out as their dissociated ions

Question 12

spectator ions

Answer 12

a type of ion that occurs on both sides of the reaction arrow in the same form, and are not part of the chemical change

Question 13

net ionic equations

Answer 13

complete ionic equations with the spectator ions emilinated

Question 13

net ionic equations

Answer 13

complete ionic equations with the spectator ions emilinated

Question 14

the net ionic equation for a precipitation reaction describes the…

Answer 14

formation of the precipitate

Question 15

the net ionic equation for an acid-base neutralization reaction describes the…

Answer 15

formation of water

Question 16

molar mass

Answer 16

the mass in grams of one mole of that element

Question 17

Avogadro’s number

Answer 17

NA = 6.0221415 x 1023 objects = 1 mole

Question 18

precipitates are weak or strong electrolytes?

Answer 18

weak

Question 19

precipitation reaction

Answer 19

A reaction in which two soluble ionic compounds form an insoluble product, a precipitate.

Question 20

precipitate

Answer 20

The insoluble product of a precipitation reaction.

Question 21

molecular equation

Answer 21

A chemical equation showing a reaction in solution in which reactants and products appear as intact, undissociated compounds.

Question 22

total ionic equation

Answer 22

An equation for an aqueous reaction that shows all the soluble ionic substances dissociated into ions.

Question 23

net ionic equation

Answer 23

A chemical equation of a reaction in solution in which spectator ions have been eliminated to show the actual chemical change.

Question 24

metathesis reaction

Answer 24

(also double-displacement reaction) A reaction in which atoms or ions of two compounds exchange bonding partners. Precipitation and acid-base reactions are examples.

Question 25

neutralization reaction

Answer 25

An acid-base reaction that yields water and a solution of a salt; when the H+ ions of a strong acid react with an equivalent amount of the OH− ions of a strong base, the solution is neutral.

Question 26

acid-base reaction

Answer 26

any reaction between an acid and a base

Question 27

acid

Answer 27

any species that produces H+ ions when dissolved in water

Question 28

base

Answer 28

any species that produces OH− ions when dissolved in water.

Question 29

mole

Answer 29

the SI unit for amount of substance

Question 30

empirical formula

Answer 30

A chemical formula that shows the lowest relative number of atoms of each element in a compound.

Question 31

molecular formula

Answer 31

A chemical formula that shows the lowest relative number of atoms of each element in a compound.