Lab Final

Question 1

percent relative uncertainty

Answer 1

tolerance/magnitude of measurement x 100 (best case is small tolerance/large measurement

Question 2

precision

Answer 2

repeatability of a set of measurements

Question 3

accurancy

Answer 3

how closely the measurements are to an accepted value

Question 4

density

Answer 4

mass/volume

Question 5

nonmetal nonmetal

Answer 5

prefixes and -ides

Question 6

ionic

Answer 6

no prefixes

Question 7

acid rule: -ide

Answer 7

hydro- -ic

Question 8

acid rule: -ate

Answer 8

-ic

Question 9

acid rule: -ite

Answer 9

-ous

Question 10

cations with common variable valences

Answer 10

Cr2+ chromium (II) and Cr3+ chromium (III)
Fe2+ iron (II) and Fe3+ iron (III)
Co2+ cobalt (II) and Co3+ cobalt (III)
Cu+ copper (I) and Cu2+ copper (II)
Sn2+ tin (II) and Sn4+ tine (IV)
Hg22+ mercury (I) and Hg2+ mercury (II)
Pb2+ lead (II) and Pb4+ lead (IV)

Question 11

GO THROUGH POLYATOMIC IONS FLASHCARDS

Answer 11

.

Question 12

Hydrate

Answer 12

a salt that has crystallized from aqueous solution with weakly bound water molecules contained in the crystals. The water molecules present are in a definite stoichiometric ratio with respect to the other atoms present in the compound.

Question 13

how to find molar mass

Answer 13

add up masses from periodic table (take mol to mol ratio into account)

Question 14

limiting reactant

Answer 14

reactant with the smallest moles

Question 15

DO A LIMITING REACTANT PROBLEM

Answer 15

.

Question 16

litmus paper

Answer 16

checks the acidity of an aqueous solution

Question 17

blue litmus paper is used for:

Answer 17

acid (turns red)

Question 18

red litmus paper is used for:

Answer 18

base (turns blue)

Question 19

dont separate

Answer 19

solids, liquids, gases, weak base, weak acid

Question 20

metathesis

Answer 20

switch pairs

Question 21

beer’s law

Answer 21

MconcVconc=MdilutedVdiluted

Question 22

reading a buret

Answer 22

find to hundred’s place, put white paper behind

Question 23

slope unit

Answer 23

M-1

Question 24

Beer’s law

Answer 24

the absorbance by a solute in solution will be directly proportional to the concentration of that solute in solution

Question 25

rate law

Answer 25

rate=k[A]x[B]y

Question 26

zero order straight line

Answer 26

[A]

Question 27

first order straight line

Answer 27

ln[A]

Question 28

second order straight line

Answer 28

1/[A]

Question 29

zero order units

Answer 29

M/s

Question 30

first order units

Answer 30

s-1

Question 31

second order units

Answer 31

M-1s-1

Question 32

third order units

Answer 32

M-2s-1

Question 33

titration

Answer 33

the purpose of a titration is to use a solution of known concentration (the titrant) to determine the concentration of an unknown solution (the analyte)

Question 34

equivalence point

Answer 34

when the exact moles of titrant equal the exact moles of analyte (endpoint is measured in lab since indicator cannot change color at equivalence point because it needs a slight excess of titrant)

Question 35

smaller pKa

Answer 35

stronger acid

Question 36

larger Ka

Answer 36

stronger acid

Question 37

Henderson-Hasselbalch equation

Answer 37

pH=pka +log(mol base/mol acid)