MO theory describes electrons as delocalized over the entire molecule.

Question 1

Which of the following best describes an ionic bond?

Accepted Answer

A bond formed by the transfer of electrons from a metal to a nonmetal, resulting in oppositely charged ions.

Question 2

Which of the following compounds is most likely to be ionic?

Accepted Answer

NaCl

Question 3

Given the ions K$^+$, Ca$^{2+}$, Cl$^-$, and O$^{2-}$, which pair would form a compound with the formula K$_2$O?

Accepted Answer

K$^+$ and O$^{2-}$

Question 4

Which statement about lattice energy is correct?

Accepted Answer

Lattice energy increases as the charge of the ions increases and the size of the ions decreases.

Question 5

Which of the following best explains why the bond angle in H$_2$O is 104.5$^	ext{o}$ rather than the expected 109.5$^	ext{o}$?

Accepted Answer

The lone pairs on oxygen repel the bonding pairs more strongly, reducing the bond angle.

Question 6

Which molecule is polar due to its molecular geometry?

Accepted Answer

NH$_3$ (trigonal pyramidal)

Question 7

Which of the following is the correct Lewis structure for the carbonate ion (CO$_3^{2-}$)?

Accepted Answer

A structure with one double bond and two single bonds, with each oxygen having a full octet and two negative charges distributed on two oxygens.

Question 8

Which of the following molecules contains a resonance structure?

Accepted Answer

O$_3$

Question 9

Which statement about electronegativity is correct?

Accepted Answer

Electronegativity decreases down a group and increases across a period.

Question 10

Which of the following molecules has the strongest dipole moment?

Accepted Answer

HF

Question 11

Which of the following is the correct formula for calcium phosphate?

Accepted Answer

Ca$_3$(PO$_4$)$_2$

Question 12

Which of the following best describes a sigma ($\sigma$) bond?

Accepted Answer

A bond formed by the end-to-end overlap of atomic orbitals along the internuclear axis.

Question 13

Which type of hybridization is present in the central atom of methane (CH$_4$)?

Accepted Answer

$sp^3$

Question 14

What is the molecular geometry of SF$_6$?

Accepted Answer

Octahedral

Question 15

Which of the following is the correct order of increasing ionic radius for the ions Na$^+$, Mg$^{2+}$, and Al$^{3+}$?

Accepted Answer

Al$^{3+}$ < Mg$^{2+}$ < Na$^+$

Question 16

Which of the following is a correct statement about molecular orbital (MO) theory?

Accepted Answer

MO theory describes electrons as delocalized over the entire molecule.

Question 17

Which of the following molecules has a bond angle closest to 120$^	ext{o}$?

Accepted Answer

BF$_3$

Question 18

Which of the following is the correct name for the compound Fe$_2$(SO$_4$)$_3$?

Accepted Answer

Iron(III) sulfate

Question 19

Which of the following is the correct formula for the hydrate copper(II) sulfate pentahydrate?

Accepted Answer

CuSO$_4$ \cdot 5H$_2$O

Question 20

Which of the following is the correct formula for sodium chlorate?

Accepted Answer

NaClO$_3$

Bonding and Molecular Structure: Study Notes for General Chemistry

Study Guide - Practice Questions