AnswersChemistry - SC3210 A-CRUnit Test

Unit Test — Unit test Answers

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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.
2
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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.
3

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–.
4

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
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

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.
7

Which statement best describes how to predict the formula of a stable ionic compound?

A
Use the same number of cations as anions so that the compound is neutral.
B
Use more cations than anions so that the compound is positively charged.
C
Use enough cations and anions so that the total charge is zero.
D
Use fewer cations than anions so that the compound is negatively charged.
8

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.
9

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.
10

Which is the IUPAC name of O3?

A
dioxide
B
oxygen
C
trioxygen
D
monoxide
11

Which statement describes the electron sea model for metallic bonding?

A
This model involves electrons held tightly between atoms.
B
This model explains all properties of metals.
C
This model involves electrons moving among bands of orbitals.
D
This model is the simplest model.
12

What is the chemical formula for copper(II) sulfate?

A
CuSO
Option A
B
CuSO
Option B
C
CuS
D
CuS
Option D
13

Which reason best explains why metals are malleable?

A
because they have delocalized electrons
B
because they have localized electrons
C
because they have ionic bonds
D
because they have rigid bonds
14

What is the ratio of Fe ions to O ions in a neutral compound?

Question illustration
A
1:2
B
2:1
C
2:3
D
3:2
15

A plate of the steel hull of a ship develops a large crack when the ship strikes a reef. Analysis of the steel’s composition shows higher-than-normal levels of an element that could explain why the plate cracked instead of bending. Which element is most likely suspected?

A
iron
B
sulfur
C
chromium
D
nickel

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