Chemical Bonding

Question 1

Lattice Energy

Answer 1

product of charge / sum of radiuses

Question 2

Hydration Enthalpy

Answer 2

k q/r

Question 3

Limitations of octet rule

Answer 3

Incomplete Octet
Expanded Octet
compounds from noble gas
odd electron
psuedo inert configuration

Question 4

favourable conditions for ionic bond formation

Answer 4

low ionisation enthalpy
high ege
lattice enthalpy should be more negative

Question 5

Formal Charge Formula

Answer 5

total valence e - non bonding - bonding e/2

Question 7

how many lobes need to interact to form sigma, pi and delta bond

Answer 7

2, 4 and 8

Question 8

if bp + lp = 4, what is the hybridisation

Answer 8

bp + lp = 4,
hybrid orbitals = 4
hybridisation = sp3

Question 9

what is the geometry of sp3 and angle

Answer 9

tetrahedral, 109.5

Question 10

what is the geometry of sp, sp2

Answer 10

linear, trigonal planar

Question 11

when do you count odd electron as lonepair

Answer 11

when electronegativity of terminal atom is greater than 2.5

Question 12

bond length formula

Answer 12

r1 + r2 - 0.09|delta en|

Question 13

bond order formula

Answer 13

sigma + pi)/sigma

Question 14

bond order formula for molecular orbital theory

Answer 14

Nb + Na/2

Question 15

condition for para and dia

Answer 15

para if unpaired electron, dia if no unpaired e

Question 16

spin only magnetic moment formula (mew s)

Answer 16

root of n (n + 2)