Question 1

Which of the following best describes an ionic bond?

Accepted Answer

Complete transfer of electrons from one atom to another.

Question 2

Given the molecule HCl, which atom is partially negative and why?

Accepted Answer

Chlorine, because it has a higher electronegativity.

Question 3

What is the formal charge on the oxygen atom in the following Lewis structure of methanol ($$CH_3OH$$)?

$$\mathrm{H}-\mathrm{C}-\mathrm{O}-\mathrm{H} (O $$has 2 lone pairs)

Accepted Answer

0

Question 4

Which molecule below contains a polar covalent bond?

A) $$O_2
B$$) $$H_2
C$$) $$H_2O
D$$) $$N_2$$

Accepted Answer

$$H_2O$$

Question 5

What is the molecular formula for a compound with the following condensed formula: $$CH_3CH_2CHOH$$?

Accepted Answer

$$C_3H_8O$$

Question 6

Which of the following is an exception to the octet rule?

Accepted Answer

$$BF_3$$

Question 7

Calculate the formal charge on the nitrogen atom in $$NH_4$$^+$$ using the formula FC = ($$group\ \#) - (\#\ of\ bonds) - (\#\ non-bonded\ electrons)$$.

Accepted Answer

+1

Question 8

Which of the following best describes the bond in $$LiF$$?

Accepted Answer

Ionic

Question 9

What is the correct Lewis structure for $$CO_2$$?

Accepted Answer

O=C=O, each O has 2 lone pairs

Question 10

Which of the following molecules has the highest electron density at the oxygen atom?

Accepted Answer

$$H_2O$$

Question 11

Which of the following is the most electronegative element?

Accepted Answer

Fluorine

Question 12

What is the bond-line representation for ethanol?

Accepted Answer

A zig-zag line with an OH group at the end

Question 13

Which of the following is the correct expanded structural formula for $$CH_3CH_2OH$$?

Accepted Answer

H H H
| | |
H-C-C-O-H
| | |
H H H

Question 14

Which of the following is the correct condensed formula for isopropanol?

Accepted Answer

$$CH_3CH(OH)CH_3$

Question 15

Which of the following acids has the following molecular formula: $$H_2SO_4$$?

Accepted Answer

Sulfuric acid

Question 16

What is the total number of valence electrons in $$CH_3CO_2^-$$?

Accepted Answer

24

Question 17

Which of the following molecules is an example of an incomplete octet?

Accepted Answer

$$BF_3$$

Question 18

Which of the following is a correct application of the formal charge formula for the oxygen atom in $$H_3PO_4$$?

Accepted Answer

$$FC = 6 - 2 - 4 = 0$$

Question 19

Which of the following steps is NOT part of drawing a Lewis structure?

Accepted Answer

Add non-bonding electrons to the most electropositive atom.

Question 20

Which of the following molecules would have a bond dipole moment?

Accepted Answer

$$H_2O$$

Module 1: Molecular Structure – Foundations of Organic Chemistry

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