Shapes of molecules

Question 1

What is the order repulsion decreases in

Answer 1

Lone-lone > Lone-Bond > Bond-Bond

Question 2

Why do lone pairs affect the shape of the molecule

Answer 2

Lone pairs occupy more space, compressing the bond angles

Question 3

Steps to predict the shape of OF2

Answer 3

1. Identify central atom
2. Calculate total outer shell electrons
3. Add electrons from each fluorine atom
4. calculate total electron pairs
5. Deduce bonding and lone pairs
6. Predict the shape

Question 4

How do electron pairs affect the shape of a molecule or ion

Answer 4

The electrons surrounding a central atom repel one another and arrange themselves as far apart to minimize repulsion

Question 5

Why do lone pairs real more than bonding pairs

Answer 5

Lone pairs repel more strongly than bonding pairs because they are slightly closer to the central atom and occupy more space.

Question 6

How do lone pairs of electrons affect the bond angle of a molecule

Answer 6

Lone pairs repel more strongly than bonded pairs, causing the bonded pairs to be slightly closer together and decreasing the bond angle

Question 7

How does the bond angle of a tetrahedral shape change when one bonding pair of electrons is replaced by a lone pair?

Answer 7

The bond angle decreases by 2.5° from 109.5° to 107°.