Unit 7 Exam Review

IMF's

100

What type of IMF's would be found in HCl?

What is dispersion and dipole-dipole

200

What IMF is the weakest?

What is Dispersion?

300

What molecule would have stronger IMF's: H₂O or CCl₄?

What is H₂O?

400

What IMF's are present in C₂H₆? 

What is Dispersion? 

500

Rank the following compounds from weakest intermolecular forces to strongest. 

Br₂       NH₃     HBr         

What is Br_{2 ,} HBr, and NH₃?     

Ionic or Covalent?

100

High melting points

What is ionic compound?

200

Zero conductivity as a pure substance

What is both (ionic and covalent)?

300

Low conductivity as a solution

What is covalent? 

400

Acidic compounds (lower pH) tend to be:

What is covalent?

500

Non-flammable

What is ionic?

VSEPR Theory

100

This is the visible shape of H₂O

What is Bent?

200

The visible shape of a molecule that has 2 total bonded atoms and unshared pairs on the central atom and 1 unshared pair

What is Linear?

300

This is the visible shape of CCl₄

What is Tetrahedral?

400

The difference between the electron geometry and visible geometry of a molecule

What are lone pair electrons are included in the electron geometry?

500

The reason for SO₂ and CO₂ to both have polar bonds but different solubilities in water (SO₂ dissolves in water but CO₂ doesn't)

Why does polar molecules dissolve in polar molecules and nonpolar molecules dissolve nonpolar molecules ("like dissolves like")?  SO₂ is a polar molecule and CO₂ is a nonpolar molecule and since "like dissolves like" SO₂ dissolves and CO₂ doesn't.  Molecular polarity determines the intermolecular forces, not bond polarity.

Molecular Polarity

100

CS₂

What is Non-polar?

200

OCl₂

What is Polar?

300

PCl₃

What is Polar?

400

CO₂

What is Non-polar?

500

These are the two things that determine the polarity of a molecule

What are visible shape and electronegativity (polar bonds)?

Misc

100

This is the range in electronegativity required to make a bond polar

What is 0.5-2.0?

200

3 properties of covalent (organic) compounds (HINT: Think back to the properties you discovered in the Properties of Compounds Lab)

What are the following properties?

- Made of only nonmetals

- Doesn't conduct as a pure substance

- Doesn't conduct electricity in solution (when dissolved in water)

- Melts

- Flammable

- Polar substances dissolve in water, Nonpolar substances do not dissolve in water

- More likely to be a liquid or gas at room temp

- Contains polar and/or nonpolar bonds

300

3 properties of ionic (inorganic) compounds?  (HINT: Think back to the properties you discovered in the Properties of Compounds Lab)

What are the following properties?

- Made of metals and nonmetals

- Doesn't conduct as a pure substance

- Conducts electricity in solution (when dissolved in water)

- Doesn't melt with a bunsen burner

- Not flammable

- Dissolves in water

- More likely to be a solid at room temp

- Does NOT contains polar and/or nonpolar bonds

400

Determine the bond polarity and molecular polarity for CH₂O

Bond polarity:

C-H: 2.5-2.1=0.4 Nonpolar

C-O: 3.5-2.5=1.0 Polar

Molecular polarity:

Polar

500

Explain why paint thinner will dissolve paint using the concept of polarity. 

What is both have the same polarity (both are non-polar) and like dissolves like?