3.1.3.5 Shapes of Simple Molecules and Ions

Question 1

How do lone pairs affect bond angles?

Answer 1

Each lone pair restricts the bond angle by 2.5 degrees

Question 2

What is the name and bond angle of a structure containing 2 bonds?

Answer 2

Linear, 180 degrees

Question 3

What is the name and bond angle of a structure containing 3 bonds?

Answer 3

Trigonal planar, 120 degrees

Question 4

What is the name and bond angle of a structure containing 4 bonds?

Answer 4

Tetrahedral, 109.5 degrees

Question 5

What is the name and bond angle of a structure containing 5 bonds?

Answer 5

Trigonal bipyramid, 90 degrees and 120 degrees

Question 6

What is the name and bond angle of a structure containing 6 bonds?

Answer 6

Octahedral, 90 degrees

Question 7

What are the steps of molecular geometry?

Answer 7

1. Count number of outer shell electrons of central atom
2. Electrons that bonding atoms bring
3. Add steps 1 and 2
4. Divide by 2 to find electron pairs
5. Look at the molecule to work out lone pairs