AnswersChemistry 1A - Mr. KaanLab: Ionic and Covalent Bonds

Lab: Ionic and Covalent Bonds — Unit test Answers

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Which best describes why NH4+ can form an ionic bond with Cl–?

A
Its outermost shell gains one or more electrons from Cl–.
B
Its positive charge is attracted to the negative charge of Cl–.
C
It has a negative charge that is spread over the entire ion.
D
It has a nitrogen atom that is strongly attracted to Cl–.
2
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Which statement about hydrogen bonds is true?

A
They are the only force that allows a gecko to climb up glass.
B
They are the weakest of the intermolecular forces.
C
They are much stronger than intramolecular forces.
D
They help water striders walk on water by creating surface tension.
3

Which of the following do Lewis structures help us understand?

A
the exact structure of a molecule
B
the number of electrons that are involved in the bonding of the molecule
C
the total number of electrons in a molecule
D
how electrons attract other electrons in a molecule
4

Geckos and water striders rely on forces between molecules. Which statement best identifies the forces involved?

A
Geckos use covalent bonds to stick to glass.
B
The type of force that water striders use is stronger than the type of force that geckos use.
C
Water striders use London dispersion forces to walk on water.
D
The type of force that geckos use is attractive, and the type of force that water striders use is repulsive.
5

The diagram below shows a group of water molecules.The water molecules in the diagram are attracted to each other by

Question illustration
A
ionic bonds.
B
hydrogen bonds.
C
London dispersion forces.
D
dipole-induced dipole interactions.
6

Which describes a step in the process of forming an ionic bond?

A
A metal atom loses electrons and becomes a positive ion.
B
A metal atom gains electrons and becomes a negative ion.
C
A nonmetal atom loses electrons and becomes a negative ion.
D
A nonmetal atom gains electrons and becomes a positive ion.
7

What is a three-dimensional structure that represents the alternating pattern of particles in a crystal?

A
a polyatomic ion
B
a crystal lattice
C
a covalent bond
D
a formula unit
8

Which is a property of covalent compounds?

A
They ionize in solution.
B
They tend to be very hard.
C
They have a low boiling point.
D
They have a high melting point.
9

Which compound most likely contains polar covalent bonds?

A
NaCl
B
AlF3
C
Br2
D
NF3
10

Based on its location in the periodic table, what can most likely be predicted about sulfur?

A
It has four valence electrons available for bonding.
B
It has four nonbonding electrons.
C
It has six valence electrons available for bonding.
D
It has six nonbonding electrons.
11

If the molecules of two different substances have a similar size but the molecules of one substance are polar while the molecules of the other substance are nonpolar, what is most likely true about the substances?

A
The polar substance has a lower boiling point than the nonpolar substance.
B
The nonpolar substance has a lower boiling point than the polar substance.
C
Both substances have similar volatilities.
D
Both substances have similar solubilities.
12

Which of the following could form an ionic bond with an anion?

A
Hg22+
B
NO2–
C
SO32–
D
Ar

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