Chapter 6, Shapes Of Molecules And Intermolecular Forces

Question 1

Name the shape and angle of molecular shapes

Answer 1

Linear, 180°
Trigonal planar, 120°
Tetrahedral, 109.5°
Octahedral, 90°
Non linear, 104.5°
Pyramidal, 107°

Question 2

How many degrees does a lone pair alter bonf angles?

Answer 2

2.5°

Question 3

What is electron pair repulsion theory?

Answer 3

Electron pairs repel.
Bond pairs repel equally
Lone pairs repel more

Question 4

Define electronegativity

Answer 4

An atoms ability to attract elections in a covalent bond

Question 5

Name thw 3 factors that effect electronegativity

Answer 5

Nuclear attraction
Electron shielding
Atomic radius

Question 6

In terms of electronegativity, wjat happens down a group?

Answer 6

Electronegativity decreases due to larger Atomic radius, more nuclear charge, more shielding

Question 7

In terms of electronegativity, what happens across a period?

Answer 7

Electronegativity increases due to smaller Atomic radius, stronger nuclear attraction

Question 8

What is the most electronegative element?

Answer 8

Fluorine

Question 9

What is a polar bond?

Answer 9

A covalent bond that has permenant dipoles which causes electrons to be unevenly distributed

Question 10

What is a London force?

Answer 10

The random movement of electrons which induces an instantaneous dipole in a neighbouring molecule

Question 11

Name 3 types of intermolecular forces

Answer 11

London forces
Permemant dipole dipole
Hydrogen bonding

Question 12

Name 3 types of intermolecular forces

Answer 12

London forces
Permemant dipole dipole
Hydrogen bonding

Question 13

Draw a hydrogen bond between 2 water molecules

Question 14

Draw the hydrogen bonding of a water molecule and and an ammonia molecule

Question 15

Name the properties of hydrogen bonding

Answer 15

Open Lattice structure in ice making it less dense than liquid water

High surface tension

High melting and boiling points