Q: Which of the following processes requires the most energy?

C) $\mathrm{Mg^+(g) \rightarrow Mg^{2+}(g) + e^-}$

Q: Which of the following best explains why $\mathrm{Mg^{2+}}$ is smaller than $\mathrm{Na^+}$?

A) $\mathrm{Mg^{2+}}$ has more protons and the same number of electrons as $\mathrm{Na^+}$, so the electrons are pulled closer.

Q: Which of the following best explains why $\mathrm{O_2}$ is a molecule but $\mathrm{NaCl}$ is an ionic solid?

A) $\mathrm{O_2}$ is formed from two nonmetals sharing electrons, while $\mathrm{NaCl}$ is formed from a metal and a nonmetal transferring electrons.

Q: Which of the following best describes the trend in electron affinity across a period?

A) Electron affinity becomes more negative (increases) from left to right.

Q: Which of the following best explains why $\mathrm{Cl_2}$ is a gas at room temperature while $\mathrm{NaCl}$ is a solid?

A) $\mathrm{Cl_2}$ has weak intermolecular forces, while $\mathrm{NaCl}$ has strong ionic bonds.

Q: Which of the following best describes the bonding in $\mathrm{CO_2}$?

A) Two double bonds between C and O

Question 1

Which of the following sets contains only species that are isoelectronic (have the same number of electrons)?

Accepted Answer

B) N3-, O2-, F-

Question 2

How many electrons are present in the carbonate ion, $\mathrm{CO_3^{2-}}$?

Accepted Answer

C) 30

Question 3

Which of the following best describes the difference between ionic and covalent bonding?

Accepted Answer

B) Ionic bonding involves a transfer of electrons and covalent bonding involves a sharing of electrons.

Question 4

Which of the following compounds is expected to exist as a molecule rather than as an ionic solid?

Accepted Answer

C) $\mathrm{C_3H_8}$

Question 5

Which of the following ions has the largest ionic radius?

Accepted Answer

C) $\mathrm{O^{2-}}$

Question 6

Arrange the following in order of increasing first ionization energy: Na, Cl, K, Rb, Ca.

Accepted Answer

A) Rb < K < Na < Ca < Cl

Question 7

Which of the following processes requires the most energy?

Accepted Answer

C) $\mathrm{Mg^+(g) \rightarrow Mg^{2+}(g) + e^-}$

Question 8

Which of the following molecules contains the most polar bonds?

Accepted Answer

A) $\mathrm{CF_4}$

Question 9

Which of the following is the correct formula for thiosulfate ion?

Accepted Answer

B) $\mathrm{S_2O_3^{2-}}$

Question 10

Which of the following best explains why $\mathrm{Mg^{2+}}$ is smaller than $\mathrm{Na^+}$?

Accepted Answer

A) $\mathrm{Mg^{2+}}$ has more protons and the same number of electrons as $\mathrm{Na^+}$, so the electrons are pulled closer.

Question 11

Which of the following is the correct Lewis structure for $\mathrm{N_2H_2}$?

Accepted Answer

A) $\mathrm{H-N=N-H}$

Question 12

Which of the following elements is most likely to form an ion with a $2-$ charge?

Accepted Answer

B) $\mathrm{O}$

Question 13

Which of the following best describes the trend in atomic radius as you move down a group in the periodic table?

Accepted Answer

B) Atomic radius increases.

Question 14

Which of the following is the correct name for $\mathrm{MnCO_3}$?

Accepted Answer

B) manganese(II) carbonate

Question 15

Which of the following best explains why $\mathrm{O_2}$ is a molecule but $\mathrm{NaCl}$ is an ionic solid?

Accepted Answer

A) $\mathrm{O_2}$ is formed from two nonmetals sharing electrons, while $\mathrm{NaCl}$ is formed from a metal and a nonmetal transferring electrons.

Question 16

Which of the following ions is isoelectronic with $\mathrm{Ne}$?

Accepted Answer

D) All of the above

Question 17

Which of the following best describes the trend in electron affinity across a period?

Accepted Answer

A) Electron affinity becomes more negative (increases) from left to right.

Question 18

Which of the following is the correct formula for dinitrogen tetroxide?

Accepted Answer

A) $\mathrm{N_2O_4}$

Question 19

Which of the following best explains why $\mathrm{Cl_2}$ is a gas at room temperature while $\mathrm{NaCl}$ is a solid?

Accepted Answer

A) $\mathrm{Cl_2}$ has weak intermolecular forces, while $\mathrm{NaCl}$ has strong ionic bonds.

Question 20

Which of the following best describes the bonding in $\mathrm{CO_2}$?

Accepted Answer

A) Two double bonds between C and O

General Chemistry: Atomic Structure, Bonding, and Periodic Trends – Study Guide

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