Question 1

How many electrons can the $p$ subshell hold?

Accepted Answer

$6$

Question 2

An atom has $17$ protons and $18$ electrons. What is the correct symbol for this ion?

Accepted Answer

$\mathrm{Cl}^-$

Question 3

How many valence electrons does a nitrogen atom have?

Accepted Answer

$5$

Question 4

Which of the following bonds is the most polar?

Accepted Answer

$\mathrm{O}-\mathrm{H}$

Question 5

What is the oxidation number of Mn in $\mathrm{MnO}_2$?

Accepted Answer

$+4$

Question 6

What is the correct name for the compound $\mathrm{Fe}_2(\mathrm{SO}_4)_3$?

Accepted Answer

Iron(III) sulfate

Question 7

What type of bond forms between sodium ($\mathrm{Na}$) and fluorine ($\mathrm{F}$) in $\mathrm{NaF}$?

Accepted Answer

Ionic

Question 8

Which molecule violates the octet rule (excluding hydrogen)?

Accepted Answer

$\mathrm{BF}_3$

Question 9

What is the formal charge on nitrogen in $\mathrm{NH}_4^+$?

Accepted Answer

$+1$

Question 10

What is the molecular geometry of $\mathrm{SO}_3$?

Accepted Answer

Trigonal planar

Question 11

Which compound is named dinitrogen tetroxide?

Accepted Answer

$\mathrm{N}_2\mathrm{O}_4$

Question 12

Where is the highest electron density found on an electrostatic potential map?

Accepted Answer

Most negative region

Question 13

Which species is reduced in a redox reaction?

Accepted Answer

Gains electrons

Question 14

A patient is given a medication containing $\mathrm{Fe}_2(\mathrm{SO}_4)_3$. What is the charge on the iron ion in this compound?

Accepted Answer

$+3$

Question 15

Which of the following best explains why $\mathrm{NaF}$ is a solid at room temperature while $\mathrm{H}_2\mathrm{O}$ is a liquid?

Accepted Answer

NaF has stronger ionic bonds than the hydrogen bonds in water.

Question 16

Which of the following molecules has a central atom with an expanded octet?

Accepted Answer

$\mathrm{PCl}_5$

Question 17

A chemist mixes $\mathrm{Cl}_2$ gas with $\mathrm{NaBr}$ solution and observes the formation of $\mathrm{Br}_2$ and $\mathrm{NaCl}$. Which species is oxidized?

Accepted Answer

$\mathrm{Br}^-$

Question 18

Which of the following best describes the electron configuration of a chloride ion ($\mathrm{Cl}^-$)?

Accepted Answer

$1s^2 2s^2 2p^6 3s^2 3p^6$

Question 19

Which of the following is the correct Lewis structure for $\mathrm{CO}_2$?

Accepted Answer

O=C=O, with each O atom having two lone pairs

Question 20

A molecule has a central atom with three bonding pairs and one lone pair. What is its molecular geometry?

Accepted Answer

Trigonal pyramidal

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