Question 1

Which of the following statements best explains why the bond in hydrogen fluoride (HF) is polar?

Accepted Answer

Fluorine is more electronegative than hydrogen, causing the shared electrons to be closer to fluorine.

Question 2

Which molecule below is nonpolar, despite having polar bonds?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 3

What is the hybridization of the central atom in methane ($$\mathrm{CH_4$}$$)?

Accepted Answer

$$\mathrm{sp^3$}$$

Question 4

How many sigma ($$\sigma) $$and pi ($$\pi) $$bonds are present in the molecule ethene ($$\mathrm{C_2H_4}$$)?

Accepted Answer

5 $$\sigma$$ bonds and 1 $$\pi$$ bond

Question 5

According to molecular orbital (MO) theory, what is the bond order of $$\mathrm{O_2$}$$?

Accepted Answer

2

Question 6

Which of the following molecules is paramagnetic according to its MO diagram?

Accepted Answer

$$\mathrm{O_2$}$$

Question 7

What is the steric number of the central atom in $$\mathrm{NH_3$}$$?

Accepted Answer

4

Question 8

Which of the following correctly matches the electron-pair geometry and ideal bond angle for a molecule with a steric number of 3 and no lone pairs?

Accepted Answer

Trigonal planar, $$120^\circ$$

Question 9

Which of the following molecules has the smallest bond angle due to the presence of lone pairs?

Accepted Answer

$$\mathrm{H_2O}$$

Question 10

Which of the following ions has 24 valence electrons?

Accepted Answer

$$\mathrm{SO_4$^{2-}}$$

Question 11

Which of the following molecules violates the octet rule by having more than 8 electrons around the central atom?

Accepted Answer

$$\mathrm{$$PCl_5$$}$$

Question 12

What is the formal charge on the central atom in the best Lewis structure for $$\mathrm{NO_3$^-}$$?

Accepted Answer

0

Question 13

Which of the following molecules has resonance structures?

Accepted Answer

$$\mathrm{O_3$}$$

Question 14

Which bond is the shortest and strongest?

Accepted Answer

Triple bond in $$\mathrm{N_2$}$$

Question 15

Which process is endothermic?

Accepted Answer

Breaking the bond in $$\mathrm{Cl_2$} to $$form two $$\mathrm{Cl}$$ atoms

Question 16

Which of the following is an ionic compound?

Accepted Answer

$$\mathrm{Na_2SO_4}$$

Question 17

Which of the following is NOT one of the seven diatomic elements?

Accepted Answer

$$\mathrm{He_2$}$$

Question 18

What is the correct name for $$\mathrm{N_2O_5}$$?

Accepted Answer

Dinitrogen pentoxide

Question 19

What is the formula for ammonium sulfate?

Accepted Answer

$$\mathrm{(NH_4$)_2SO_4}$$

Question 20

Which of the following is the correct name for $$\mathrm{H_2SO_4}$$?

Accepted Answer

Sulfuric acid

Chemical Bonding, Molecular Structure, and Nomenclature: Study Guide

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