Chapter 6 - Shape Of Molecules And Ions

Question 1

Why is electron pair repulsion theory important when it comes to the shape of a molecule and polyatomic ion?

Answer 1

The electrons are arranged as far apart as possible as the electrons repel each other

Question 2

Why does a lone pair repel more strongly?

Answer 2

The lone pair is closer to the central atom

Question 3

What is the bond angle reduced by for each lone pair?

Answer 3

2.5°

Question 4

What is the name for a molecule that has 2 bonding regions and no lone pairs? And what is its bond angle?

Answer 4

Linear - 180 degrees

Question 5

What is a lone pair?

Answer 5

An outer shell pair of electrons that is not involved in chemical bonding

Question 6

Give the name and bond angles of the shape of a molecule containing 3 bonding regions and no lone pairs?

Answer 6

Trigonal planar - 120 degrees

Question 7

What is the name and bond angle of the shape of the molecule containing 4 bonding regions and no lone pairs?

Answer 7

Tetrahedral -109.5 degrees

Question 8

What is the name of the shape of the molecule containing 6 bonding regions and no lone pairs?

Answer 8

Octahedral - 90 degrees

Question 9

The greater the number of electron pairs, the smaller the ….

Answer 9

Bond angle

Question 10

What is the name given to the shape of a molecule which has 3 bonding regions and 1 lone pair? What are the bond angles

Answer 10

Trigonal pyramidall -107 degrees

Question 11

What is the name given to the shape of a molecule which has 2 bonding regions and 2 lone pairs? What is the bond angle?

Answer 11

Bent/non-linear — 104.5 degrees

Question 12

What is a bond angle?

Answer 12

The angle between two bonds of an atom