Misc

Question 1

Formal charge formula

Answer 1

FC= V-N(nb)-(1/2)N(b)

V- electrons in normal valence

Question 2

BeCl2

Answer 2

Linear

Angle=180

Question 3

BH3

Answer 3

Trigonal planar

120

Question 4

CH4

Answer 4

Tetrahedral

109.5

Question 5

PCl5

Answer 5

Trigonal bipyramidal

90, 120, 180

Question 6

SF6

Answer 6

Octahedral

90,180

Question 7

NH3

Answer 7

Trigonal pyramidal

107

Question 8

H20

Answer 8

Bent

104.5

Question 9

Formula for moles

Answer 9

Moles = mass of sample (g) / molar mass (g/mol)

Question 10

Gram equivalent weight

Answer 10

Molar mass/n

n is the number of particles of interest produced or consumed per molecule of the compound in the reaction

Question 11

Equivalents

Answer 11

Mass of compound (g) / gram equivalent weight (g)

Question 12

Normality (N)

Answer 12

Equivalents/L

1 N soln of acid contains a concentration of hydrogen ions equal to 1 mole per liter

Question 13

Molarity

Answer 13

Normality/n

n is number of thing in question

Question 14

Planck relation

Answer 14

E=hf (or hv)

Energy =

h 6.626 x 10-34 J•s
f frequency of radiation

Question 15

Angular momentum of an electron

Answer 15

L = nh/2pi

n is the principal quantum number
h is Plancks constant 6x10-34 Js

Question 16

Energy of an electron

Answer 16

E=-Rh/n^2

Rh=Rydberg unit of energy = 2x10-18 J/electron

Question 17

Electromagnetic energy of a photon

Answer 17

E=hc/λ

h is plancks constant 6x10-34 Js
c is speed of light in a vacuum 3x10^8 m/s
λ is wavelength of the radiation

Question 18

Best electrolytes

Answer 18

Dissociate readily (high dissociation constant) and are ionic compounds with large amounts of cations and anions