Chem shapes

Question 1

linear

Answer 1

• 2 regions of electrons around the central atom
• 2 bonded electron regions

[all bonded]

Question 2

trigonal planar

Answer 2

• 3 regions of electrons around the central atom
• 3 bonded electron regions

[all bonded]

Question 2

bent (120*)

Answer 2

• 3 regions of electrons around the central atom
• 2 bonded electron regions

Question 2

tetrahedral

Answer 2

• 4 regions of electrons around the central atom
• 4 bonded electron regions

[all bonded]

Question 3

trigonal pyramidal

Answer 3

• 4 regions of electrons around the central atom
• 3 bonded electron regions

Question 4

bent (109*)

Answer 4

• 4 regions of electrons around the central atom
• 2 bonded electron regions

Question 5

example: The shape of a molecule of water is bent

explain why:

Answer 5

This is because water has 4 regions of electrons around the central atom, and only 2 of the regions are bonded.

So this makes it bent (or v-shaped) with an angle close to 109 degrees.

Question 6

Finish the explanation:

These regions of electrons repel each other to give minimum repulsion…

Answer 6

(with maximum separation) when the bond angle is ________.