Topic 2 - Covalent bonding

Question 1

Covalent bonding

Answer 1

Electrostatic attraction between shared electrons and the positive nucleus

Question 2

Dative bone

Answer 2

One atom donates 2 electrons to an atom or ion to form a bond

Question 3

High electron density=

Answer 3

Stronger attractive force
Shorter bond
higher bond enthalpy

Question 4

BP = 2
LP = 0

Answer 4

Linear
180 degrees

Question 5

BP = 3
LP = 0

Answer 5

Trigonal planar
120 degrees

Question 6

BP = 4
LP = 0

Answer 6

Tetrahedral
109.5 degrees

Question 7

BP = 5
LP = 0

Answer 7

Trigonal Bipyramidal
90 & 120 degrees

Question 8

BP = 6
LP = 0

Answer 8

Octahedral
9o degrees

Question 9

BP = 3
LP = 1

Answer 9

Trigonal pyramidal
107 degrees

Question 10

BP = 2
LP = 2

Answer 10

Bent
104.5

Question 11

BP = 3
LP = 2

Answer 11

Distorted T
87.5 degrees

Question 12

BP = 4
LP = 1

Answer 12

Seesaw
87 & 102 degrees

Question 13

BP = 5
LP = 1

Answer 13

Square pyramidal
81.9 & 90 degrees

Question 14

BP = 4
LP = 2

Answer 14

Square planar
90 degrees

Question 15

Graphite

Answer 15

Each carbon boded 3 times
1 delocalised electron
Strong covalent bonds
Week forces between layers

Question 16

Diamond & Silicon dioxide

Answer 16

Each carbon bonded 4 times into tetrahedral shape.
Tightly packed rigid arrangement allow heat to conduct well.
Many strong covalent bonds.

Question 17

Graphene

Answer 17

1 layer of graphite.
Hexagonal carbon rings
delocalised electrons