AnswersFoothill-B Period-Chemistry-2627BLab: Titration

Properties and Uses of Unsaturated Hydrocarbons Answers

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1
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What is the name for this molecule?

Question illustration
A
nonene
B
nonane
C
1-octyne
D
1-octene
2
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Which step in naming unsaturated hydrocarbons is used for alkenes but not alkynes?

A
Identify the longest chain of carbon atoms.
B
Examine the multiple bond for cis- and trans- isomers.
C
Number the chain of carbons, starting with the end nearest the multiple bond.
D
Add a number prefix indicating the first carbon atom in the multiple bond.
3

Which of the molecules below is propyne?

A
Two carbons are double bonded to each other; the pair is single bonded to H above left, below left, and below right, and to C H 3 above right.
Option A
B
Two 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 B
C
An H is single bonded to C, which is triple bonded to another C, which in turn is single bonded to a C with H above and below and yet another C to the right; the final C is bonded to H above, below, and right.
Option C
D
An H is single bonded to C, which is triple bonded to another C, which in turn is single bonded to a C which is bonded to H above, below, and right.
Option D
4

Rubber is manufactured from latex that is produced from rubber trees. Which statement about rubber is true?

A
It is made from the polymerization of a long chain of aromatic molecules.
B
It is made from the polymerization of a short chain of chloroprene molecules.
C
It is made from the polymerization of a long chain of alkene molecules.
D
It is made from the polymerization of a short chain of styrene molecules.
5

Plant oils are made up of small organic molecules that are called terpenes. The compound below is an example of one type of terpene.Which best describes this compound?

Question illustration
A
a manufactured, branched-chain alkyne
B
a naturally occurring, aromatic hydrocarbon
C
a manufactured, straight-chain alkene
D
a naturally occurring, branched-chain alkene
6

Which is composed of alkynes?

A
acetylene
B
margarine
C
rubber tires
D
polystyrene cups
7

Consider the hydrocarbon below.What is the name of this hydrocarbon?

Question illustration
A
propene
B
pentene
C
butene
D
ethene
8

Which is composed of alkynes?

A
acetylene
B
margarine
C
rubber tires
D
polystyrene cups
9

Which is composed of aromatic hydrocarbons?

A
clothing
B
barbeque fuel
C
pain relievers
D
polyvinyl chloride
10

Consider the four hydrocarbons in the table below. One is an alkyne, and the other three are alkenes. HydrocarbonBoiling point (°C)W–23.0X –103.7Y–75.0Z –47.0If these hydrocarbons were similar in size, which one would most likely be an alkyne?

A
W
B
X
C
Y
D
Z
11

Consider the hydrocarbon below.What is the name of this hydrocarbon?

Question illustration
A
propene
B
pentene
C
butene
D
ethene
12

How are the vapor pressure and boiling point of alkynes affected as the chain length increases?

A
Both vapor pressure and boiling point decrease.
B
Both vapor pressure and boiling point increase.
C
Vapor pressure increases, and boiling point decreases.
D
Vapor pressure decreases, and boiling point increases.
13

Rubber is manufactured from latex that is produced from rubber trees. Which statement about rubber is true?

A
It is made from the polymerization of a long chain of aromatic molecules.
B
It is made from the polymerization of a short chain of chloroprene molecules.
C
It is made from the polymerization of a long chain of alkene molecules.
D
It is made from the polymerization of a short chain of styrene molecules.
14

What is the name for this molecule?

Question illustration
A
nonene
B
nonane
C
1-octyne
D
1-octene
15

Which of the molecules below is propyne?

A
Two carbons are double bonded to each other; the pair is single bonded to H above left, below left, and below right, and to C H 3 above right.
Option A
B
Two 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 B
C
An H is single bonded to C, which is triple bonded to another C, which in turn is single bonded to a C with H above and below and yet another C to the right; the final C is bonded to H above, below, and right.
Option C
D
An H is single bonded to C, which is triple bonded to another C, which in turn is single bonded to a C which is bonded to H above, below, and right.
Option D
16

What is the name of a hydrocarbon that has the formula CH3(CH2)4CCH?

A
6-heptyne
B
1-heptene
C
1-heptyne
D
6-heptene
17

Which is a property of both alkenes and alkynes?

A
Both are highly water soluble.
B
The pH of these hydrocarbons tends to be very basic.
C
Their boiling points tend to increase with chain length.
D
Their densities are all much higher than that of water.
18

Consider the four hydrocarbons in the table below. One is an alkyne, and the other three are alkenes. HydrocarbonBoiling point (°C)W–23.0X –103.7Y–75.0Z –47.0If these hydrocarbons were similar in size, which one would most likely be an alkyne?

A
W
B
X
C
Y
D
Z

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