Unit 1 Topic 3 ✓

Question 1

What is a Dative bond?

Answer 1

A dative bond is a covalent bond where the bonding pair of electrons are provided by one atom

e.g. in a Hydronium ion oxygen supplies both electrons

Question 2

What is a Linear shape?

(What is the related bond angle?)

Answer 2

A linear shape has 2 electron pairs bonded to the central atom.
It has as a bond angle of 180 degrees

NOTE: Think of a straight line

Question 3

What is a Trigonal Planar shape?

(What is the related bond angle?)

Answer 3

A trigonal planar shape has 3 electron pairs bonded to the central atom.
It has a bond angle of 120 degrees

NOTE: Think of a triangle shape

Question 4

What is a Tetrahedral shape?

(What is the related bond angle?)

Answer 4

A tetrahedral shape has 4 eletron pairs bonded to the central atom.
It has a bond angle of 109.5 degrees

NOTE: Think of a pyramid shape

Question 5

What is a Trigonal Bipyramidal shape?

(What is the related bond angles?)

Answer 5

A trigonal bipyramidal shape has 5 electron pairs bonded to the central atom.
It has two bond angles, 90 and 120 degrees

NOTE: Its shape is like trigonal planar (3 pairs) + linear (2 pairs)

Question 6

What is an Octahedral shape?

(What is the related bond angle?)

Answer 6

An octahedral shape has 6 electron pairs bonded to the central atom.
It has a bond angle of 90 degrees

Question 7

What is VSEPR theory?

Answer 7

VSEPR theory states that the shape of a molecule is the shape which minimises the repulsion between electron pairs, and maximises seperation

NOTE: VSEPR - Valence Shell Electron Pair Repulsion