Exam 3 Prep.

Question 1

Exothermic

Answer 1

The reactant releases energy to make the product. Denoted as (-).

Question 2

Endothermic

Answer 2

The reactant absorbs energy to make the product. Denoted as (+).

Question 3

What is VSEPR Theory?

Answer 3

The best arrangement of electron groups is the one that minimizes repulsion between them. (they want to be really far away from one another)

Question 4

What are the degrees of difference for each shape?
1. Linear
2. Trigonal Planar
3. Tetrahedral

Answer 4

1. 180 degrees
2. 120 degrees
3. 109.5 degrees

Question 5

What is Electron Geometry?

Answer 5

The arrangement of electron groups that surround a central atom of a molecule.

Question 6

What is Molecular Geometry?

Answer 6

The overall shape of the molecule. How are the atoms arranged?

Question 7

Given the amount of electron groups around a central atom, what is the electron geometry of each option?
1. 2 electron groups
2. 3 electron groups
3. 4 electron groups

Answer 7

1. linear
2. trigonal planar
3. tetrahedral

Question 8

Given the amount of bonding groups/lone pairs around the central atom, what is the molecular geometry of each option?
1. 2 bonding groups
2. 3 bonding groups
3. 4 bonding groups
4. 2 bonding groups- 1 lone pair
5. 3 bonding groups- 1 lone pair
6. 2 bonding groups- 2 lone pairs

Answer 8

1. linear
2. trigonal planar
3. tetrahedral
4. bent
5. trigonal pyramidal
6. bent

Question 9

What are the criteria of electronegativity difference to categorize a bond as the below options?
1. Non-Polar (Pure) Bond
2. Polar Covalent Bond
3. Ionic Bond

Answer 9

1. 0.0-0.4
2. 0.41-2.0
3. 2.1+

Question 10

What is Molecular Polarity?

Answer 10

This is when a molecule is polar.
(This is not about the bonds. It’s about the overall electronegativity of the molecule and whether it’s balanced or not.)

Question 11

What are the two exceptions to ELectron Configurations?

Answer 11

1. (Cu) Copper w/ 1 extra electron on d.
2. (Cr) Chromium w/ 1 extra electron on d.

Question 12

Describe the trends on the periodic table of the options below:
1. Atomic Size
2. Metallic Character
3. Ionization Energy
4. Electronegativity

Answer 12

1. (bottom left)
2. (bottom left)
3. (top right)
4. (top right)