Ch. 8 - Lewis Diagrams and VSEPR Geometries

Question 1

What is the octet rule?

Answer 1

Stable compounds and elements tend to exchange electrons so that they have a full 8 electrons in their valence shell.

Question 2

What are the three types of bonding?

Answer 2

Ionic, covalent, and metallic.

Question 3

What is a covalent bond?

Answer 3

When valence electrons are shared between two or more atoms.

Question 4

What is bond order?

Answer 4

The number of electrons involved in holding a pair of atoms together.

Question 5

What is the bond order of a single bond?

Answer 5

1

Question 6

What is the bond order of a double bond?

Answer 6

2

Question 7

What is the bond order of a triple bond?

Answer 7

3

Question 8

What is the bond order of benzene?

Answer 8

1.5

Question 9

How do you calculate formal charges?

Answer 9

Assign one electron from each bond to each element involved in that bond. Add non-bonding electrons to their associated elements and then compare to that element’s valence electrons.

Question 10

What are resonance structures?

Answer 10

Molecules that can have different valid Lewis diagrams by moving electrons (but not atoms) to different positions.

Question 11

What is a steric number?

Answer 11

The number of atoms and lone pairs bonded to an element in a molecule.

Question 12

What is the electron group geometry of a molecule with a steric number of 2?

Answer 12

Linear (180°)

Question 13

What is the electron group geometry of a molecule with a steric number of 3?

Answer 13

Trigonal planar (120°)

Question 14

What is the electron group geometry of a molecule with a steric number of 4?

Answer 14

Tetrahedral (109.47°)

Question 15

What is the electron group geometry of a molecule with a steric number of 5?

Answer 15

Trigonal bipyramidal (90°, 120°, 180°)

Question 16

What is the electron group geometry of a molecule with a steric number of 6?

Answer 16

Octahedral (90°, 180°)

Question 17

What is the molecular geometry of a molecule with a steric number of 2 and no lone pairs?

Answer 17

Linear

Question 18

What is the molecular geometry of a molecule with a steric number of 3 and no lone pairs?

Answer 18

Trigonal planar

Question 19

What is the molecular geometry of a molecule with a steric number of 3 and 1 lone pair?

Answer 19

Bent

Question 20

What is the molecular geometry of a molecule with a steric number of 4 and no lone pairs?

Answer 20

Tetrahedral

Question 21

What is the molecular geometry of a molecule with a steric number of 4 and 1 lone pair?

Answer 21

Trigonal pyramidal

Question 22

What is the molecular geometry of a molecule with a steric number of 4 and 2 lone pairs?

Answer 22

Bent

Question 23

What is the molecular geometry of a molecule with a steric number of 5 and no lone pairs?

Answer 23

Trigonal bipyramidal

Question 24

What is the molecular geometry of a molecule with a steric number of 5 and 1 lone pair?

Answer 24

Seesaw

Question 25

What is the molecular geometry of a molecule with a steric number of 5 and 2 lone pairs?

Answer 25

T-shaped

Question 26

What is the molecular geometry of a molecule with a steric number of 5 and 3 lone pairs?

Answer 26

Linear

Question 27

What is the molecular geometry of a molecule with a steric number of 6 and no lone pairs?

Answer 27

Octahedral

Question 28

What is the molecular geometry of a molecule with a steric number of 6 and 1 lone pair?

Answer 28

Square pyramidal

Question 29

What is the molecular geometry of a molecule with a steric number of 6 and 2 lone pairs?

Answer 29

Square planar