Question 1

Which of the following best describes the bond between nitrogen and fluorine in terms of polarity and partial charges? Use the electronegativity values provided.

Accepted Answer

The bond is polar, with nitrogen carrying the 𝛅+ and fluorine carrying the 𝛅−.

Question 2

Given the structure below, what is the correct IUPAC name for the compound?

Accepted Answer

2,3-dimethylpentane

Question 3

Which of the following molecules contains a functional group classified as an ester?

Accepted Answer

CH3COOCH2CH3

Question 4

Which of the following best explains why fatty acid A has a higher boiling point than fatty acid C?

Accepted Answer

Fatty acid A is saturated, allowing for stronger London dispersion forces and tighter packing.

Question 5

Rank the following compounds in order of increasing boiling point: acetone, acetic acid, butane. Explain your reasoning based on intermolecular forces.

Accepted Answer

Butane \u003c Acetone \u003c Acetic acid; London dispersion \u003c dipole-dipole \u003c hydrogen bonding

Question 6

Which of the following amino acids would most likely be found in the interior of a folded protein? (Assume the protein is in aqueous solution.)

Accepted Answer

Leucine

Question 7

Which of the following best describes the intermolecular attraction indicated by arrow 'b' in the acetamide diagram?

Accepted Answer

Hydrogen bonding

Question 8

What is the correct chemical formula for tetraphosphorous pentaoxide?

Accepted Answer

$$\mathrm{P_4O_{10}}$$

Question 9

Which of the following bonds is the most polar, based on the electronegativity values provided?

Accepted Answer

O–H

Question 10

Which of the following best explains why acetic acid has a higher boiling point than acetone, even though both have similar molecular masses?

Accepted Answer

Acetic acid forms hydrogen bonds, while acetone cannot.

Question 11

Which of the following is the correct name for the compound $$\mathrm{Ba_3$(PO_4$)_2}$$?

Accepted Answer

Barium phosphate

Question 12

Which of the following statements about the polarity of the molecule CH$$_3CN is $$correct?

Accepted Answer

The molecule is polar due to the large electronegativity difference between C and N.

Question 13

Which of the following best describes the intermolecular force responsible for the high boiling point of water?

Accepted Answer

Hydrogen bonding

Question 14

Which of the following is the correct formula for vanadium (VIII) sulfide?

Accepted Answer

$$\mathrm{VS_8$}$$

Question 15

Which of the following best explains why polyunsaturated fatty acids have lower boiling points than saturated fatty acids?

Accepted Answer

Polyunsaturated fatty acids have more double bonds, which introduce kinks and prevent tight packing.

Question 16

Which of the following functional groups is present in the molecule shown below (image 5)?

Accepted Answer

Ether

Question 17

Which of the following best describes the molecular geometry around the central carbon in the molecule shown in image 6?

Accepted Answer

Tetrahedral

Question 18

Which of the following is the correct Lewis structure for methanol ($$\mathrm{CH_3OH}$$)?

Accepted Answer

A central carbon bonded to three hydrogens and one oxygen, with the oxygen bonded to a hydrogen and two lone pairs.

Question 19

Which of the following best explains why leucine and phenylalanine are found in the interior of proteins?

Accepted Answer

They are nonpolar and hydrophobic, so they aggregate away from water.

Chemistry 107 Exam 2 Study Guidance – Molecular Structure, Bonding, and Intermolecular Forces

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