EXAM 2 REVIEW

CHEM 3A

100

For a bond to be IONIC, the electronegativity difference between two elements must range from ____ to ____

2.0 and above

200

What is the formula for phosphorous acid?

H₃PO₃

300

What is the formula for the following acid: perchloric acid

HClO₄

400

For a bond to be POLAR COVALENT, the electronegativity difference between two elements must range from ____ to ____

0.5 - 2.0

500

What is the lewis structure and molecular geometry of PO₄^3-

N/A

CHEM 3A

100

What is the molecular geometry if you have 4 single bonds around the central atom and no lone pairs?

Tetrahedral

200

What is the angle between electron groups in the trigonal planar geometry?

120^o

300

What is the name of K₃PO₄?

Potassium Phosphate

400

How can you tell if a bond is polar or non-polar?

1. Electronegativity

2. Shape (symmetry/asymmetry)

500

What is the molecular formula if the empirical formula is C₂H₅ and the molecular molar mass is 58.14 g/mol?

C₄H₁₀

CHEM 3A

100

For a bond to be NON-POLAR COVALENT, the electronegativity difference between two elements must range from ____ to ____

0 - 0.4

200

What is the name of this polyatomic ion?  CO₃^-2

Carbonate

300

What is the molecular geometry of SO₂?

Trigonal Planar - bent

400

What is the empirical formula for the following molecular formula: C₆H₁₄

C₃H₇

500

What is the lewis structure and molecular geometry of CO₃^2-

N/A

CHEM 3A

100

Use your knowledge and electronegativity sheet to predict what type of bond would form between calcium and bromine.

Ionic

200

The electronegativity value of Carbon is 2.5 and the electronegativity value of Oxygen is 3.5. The bond between C and O is __________

Polar

300

Use your knowledge and electronegativity sheet to predict what type of bond would form between phosphorus and fluorine.

Polar covalent

400

The electronegativity difference in the bonds of CH₄ is 0.4, therefore, CH₄ is ___________

Non-polar

500

Will PH₃ be polar or non-polar based on the electronegativity difference and the shape?

Non-polar

CHEM 3A

100

Starting from the strongest, arrange these intermolecular forces:

1. Dipole-dipole

2. Dispersion

3. Hydrogen Bonding

3>2>1

200

H₂S has what kind of intermolecular force?

Dipole-dipole

300

Which of the following has the highest boiling point? 

H₂, N₂, NH₃, O₂

NH₃

400

All molecules have London forces between them, but dipole-dipole and hydrogen bonding are so much stronger that when they are present we can ignore London forces.  Which of these has ONLY London forces? 

I₂, OCl₂, NH₃, SH₂

I₂

500

What's is the relationship between intermolcular forces and:

1. Boiling point

2. Melting point

3. Viscous

4. Surface

All of them increases as IMF increases