2a-b Intra and Intermolecular Forces Review

2a-b Intra and Intermolecular Forces Review

​

Discussion question: How do medicines work?

Open Ended

If valence electrons are tied up in bonds, how do they flow to carry electric current? (Hint: think about metallic bonds.)

Crash Course Engineering: Metals & Ceramics

(4:22-4:56) (2:44-3:04)

https://youtu.be/NOK1nMiiTWU

Multiple Choice

The ability of a material to be drawn out into long, thin strands is called:

• malleability

• ductility

• conductors

Why ionic compounds are BRITTLE

(opposite of malleable)

​

Multiple Select

When can ionic compounds carry electric current? (check all that apply)

• as solid crystals

• when melted (liquid)

• when dissolved in water

Multiple Choice

What is the advantage of polymers?

• flexible, but can be cross-linked to make them stiff

• cheap to produce

• versatile

• all are advantages

Multiple Choice

What phenomenon allows bugs to walk on water and accounts for bubbles to be able to expand without popping?

• ionic bonds

• surface tension

• capillary action

Multiple Choice

Rank the forces from weakest to strongest.

• hydrogen < ionic < covalent < metallic < dipole-dipole < London dispersion

• London dispersion < dipole-dipole < hydrogen < covalent < ionic < metallic

Multiple Choice

Statement A: Propane (H₃CCH₂CH₃) has a lower boiling point than pentane (H₃CCH₂CH₂CH₂CH₃).

Statement B: Shorter molecules are less polarizable and have weaker London dispersion forces than long molecules.

Statement C: Statement B explains why Statement A is true.

• A) True

  B) True

  C) True

• A) True

  B) False

  C) False

• A) False

  B) False

  C) False

Multiple Choice

Statement A: The melting point of iron is higher than the melting point of iron(III) bromide (FeBr₃).

Statement B: Metallic bonds are stronger than covalent bonds.

Statement C: Statement B explains why statement A is true.

• A) True

  B) True

  C) True

• A) True

  B) True

  C) False

• A) False

  B) False

  C) False

Multiple Choice

If you used a NONPOLAR thin layer chromatography plate with a POLAR solvent to separate 2 compounds, which compound would go farther faster?

• the more polar compound

• the more nonpolar compound

Multiple Choice

Which separation method separates compounds based on differences in their boiling points?

• filtration

• centrifugation

• distillation

• chromatography

Quiz

• 13 questions

• Open note (flowchart, notes, periodic table)

• Google/Internet search NOT allowed.