exam 2

Question 1

Avogadro’s number and use

Answer 1

6.022 x 10^23 atoms / 1 mol

Used to find number of atoms

Question 2

Diatomic molecules and definition

Answer 2

Diatomic - consisting of two atoms

Br,I,N,Cl,H,O,F

Question 3

Hg2^2+

Answer 3

Mercury(I)

Question 4

NH4^+

Answer 4

Ammonium

Question 5

NO2^-

Answer 5

Nitrite

Question 6

NO3^-

Answer 6

Nitrate

Question 7

SO3^2-

Answer 7

Sulfite

Question 8

SO4^2-

Answer 8

Sulfate

Question 9

HSO4^-

Answer 9

Hydrogen sulfate

Question 10

OH^-

Answer 10

Hydroxide

Question 11

CN^-

Answer 11

Cyanide

Question 12

PO4^3-

Answer 12

Phosphate

Question 13

HPO4^2-

Answer 13

Hydrogen phosphate

Question 14

H2PO4^-

Answer 14

Dihydrogen phosphate

Question 15

NCS^- or SCN^-

Answer 15

Thiocyanate

Question 16

CO3^2-

Answer 16

Carbonate

Question 17

HCO3^-

Answer 17

Hydrogen carbonate

Question 18

ClO^- or OCL^-

Answer 18

Hypochlorite

Question 19

ClO2^-

Answer 19

Chlorite

Question 20

Clo3^-

Answer 20

Chlorate

Question 21

ClO4^-

Answer 21

Perchlorate

Question 22

C2H3O2^-

Answer 22

Acetate

Question 23

MnO4^-

Answer 23

Permanganate

Question 24

Cr2O2^2-

Answer 24

Dichromate

Question 25

CrO4^2-

Answer 25

Chromate

Question 26

O2^2-

Answer 26

Peroxide

Question 27

C2O4^2-

Answer 27

Oxalate

Question 28

S203^2-

Answer 28

Thiosulfate

Question 29

First rule for solubility - nitrates

Answer 29

All nitrates are soluble. (NO3^- salts)

Question 30

Second rule for solubility - salts containing ? are soluble

Answer 30

All salts containing Li+, Na+, K+, Rb+, Ca+, NH4+ as a cation are soluble.

Question 31

Third rule for solubility - salts are soluble unless…

Answer 31

Most Cl-, Br-, I- salts are soluble unless the cation is Pb2+, Ag+, Hg2+

Question 32

Fourth rule for solubility - sulfate salts are soluble except…

Answer 32

Most sulfate salts are soluble. Notable exceptions are BaSO4, PbSO4, and CaSO4.

Question 33

Fifth rule for solubility - hydroxides are insoluble except…

Answer 33

Most hydroxides are insoluble except LiOH, NaOH, KOH, CaOH.

Question 34

Sixth rule for solubility - ? salts are slightly soluble except

Answer 34

Most sulfide (S2-), carbonate (CO3^2-), chromate (CrO4^2-), and phosphate (PO4^3-) salts are only slightly soluble, except those containing Li+, Na+, K+, Rb+, Ca+, NH4+.

Question 35

Molarity definiton and example

Answer 35

Molarity - a measure of concentration.

mol/L=M (mole over liter equals molar)