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Properties and Uses of Unsaturated Hydrocarbons — Unit test Answers

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1
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What is a characteristic of branched chained alkanes?

A
They have one or more rings of carbon atoms.
B
They have carbon atoms that are double-bonded to other carbon atoms.
C
They have more than two carbons that are bonded to only one other carbon.
D
They have carbons bonded in a single row from one end of the molecule to the other end of the molecule.
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

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.
4

Which compound most likely contains polar covalent bonds?

A
NaCl
B
AlF3
C
Br2
D
NF3
5

How do aromatic hydrocarbons differ from alkenes?

A
Aromatic hydrocarbons are unsaturated, and alkenes are saturated.
B
Alkenes are saturated, and aromatic hydrocarbons are unsaturated.
C
Aromatic hydrocarbons are flat, geometric molecules, and alkenes are not.
D
Alkenes are flat, planar molecules, and aromatic hydrocarbons are not.
6

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.
7

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
8

Consider the hydrocarbon below.Which of these is a trans- isomer of the above hydrocarbon?

Question illustration
A
A skeletal model with a 6 carbon chain, with a double bond between the second and third carbon.
Option A
B
A skeletal model with line segments that slant up, run flat in a double bond, slant down, run flat, and slant down again.
Option B
C
A skeletal model of a 5 carbon chain with a double bond between the first and second carbons.
Option C
D
A skeletal model with line segments that slant up, fun flat in a double bond, slant up, and run flat.
Option D
9

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
10

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.
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

Eugene works at a carpet factory. Which natural polymer does he most likely work with to make the carpets?

A
wool
B
rubber
C
nylon
D
silk
13

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.
14

Which molecule is an aromatic hydrocarbon?

A
Two central carbons are double bonded to each other; the pair is single bonded to C H 3 above left and right, and to H below left and right.
Option A
B
A skeletal model has line segments that slant up, down, up, and up again in a triple bond.
Option B
C
Two hexagon rings with carbons at each corner have alternating double bonds and share one side. H is single bonded to all the C's except the ones on the shared side.
Option C
D
Two carbons are triple bonded to each other; each has a single bond to the outside.
Option D
15

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.

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