AnswersS1S Chemistry B E4912 - AGUnit Test

Unit Test — Unit test Answers

25 verified answers
1
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What is the name of the hydrocarbon CH3(CH2)6CH3?

A
butane
B
decane
C
octane
D
propane
2
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What is the name of this hydrocarbon?

Question illustration
A
hexane
B
heptane
C
octane
D
pentane
3

Which is composed of alkenes?

A
welding torch fuel
B
polystyrene cups
C
propane gas
D
degreaser containing hexane
4

What is a disadvantage of using a space-filling model to show a chemical compound?

A
Space-filling models provide a two-dimensional view of the molecule.
B
Space-filling models do not identify the number and type of bonds.
C
Space-filling models do not show all atoms in the molecule.
D
Space-filling models show information about composition but not structure.
5

Which compound can be used to preserve biological specimens?

A
A central C is double bonded to an O, and single bonded to 2 H.
Option A
B
A chain, reading from left: C H 3 bonded to C, bonded to O, bonded to C H 2, bonded to C H2, bonded to C H 3. The single C near the beginning of the chain is double bonded to O.
Option B
C
C H 3 single bonded to C, which is double bonded above right to O, and below right to C H 2, which is bonded to C H 3.
Option C
D
A central C is double bonded to an O above, and single bonded to C H 3 below left and O H below right.
Option D
6

What are geometric isomers?

A
compounds that have the same types of atoms arranged in different orders
B
compounds that have the same number of carbon atoms arranged in different orders
C
compounds that have the same atoms arranged in the same order, but with different three-dimensional orientations
D
compounds that have the same atoms arranged in the same order, and have the same three-dimensional orientations
7

Trevor watches as a freight train passes. He counts eight identical black railroad cars, then a red car, followed by several more black cars. Which type of organic compound does the train most closely model?

A
an alkyl halide
B
an aldehyde
C
an ether
D
a carboxylic acid
8

Which molecule has a structure that is most like aspirin?

A
propene
B
octyne
C
benzene
D
butane
9

What is the general formula for a secondary amine?

A
RNH2
B
H2NRNH2
C
RN2H
D
R2NH
10

What is the name of this hydrocarbon?

Question illustration
A
1-methylbutane
B
2-methylbutane
C
2-methylpropane
D
3-methylpropane
11

Which class of organic compound is commonly used in perfumes?

A
amine
B
alcohol
C
ester
D
ether
12

Acetic acid, an organic compound, has the following structural formula.What is the chemical formula for acetic acid?

Question illustration
A
CHO
B
C2H4O2
C
C2OH
D
C2O2H
13

Which activity most likely involves the direct use of saturated hydrocarbons?

A
burning natural gas
B
dissolving salt in water
C
carving stone with hammer and chisel
D
bending steel by hand
14

The molecular formula for methanol is CH3OH. Which model shows methanol? (black = carbon; red = oxygen; white = hydrogen)

A
mc022-1.jpg
Option A
B
A space-filling model has a black atom with three white atoms bonded to a red atom with one white atom.
Option B
C
A ball and stick model has 2 black atoms bonded to each other. One has three white atoms bonded to it; the other has two white atoms, and a red atom bonded to a white atom.
Option C
D
A central red atom is bonded on each side to a black atom, each of which is bonded to 3 white atoms.
Option D
15

Consider this hydrocarbon.Is this an aromatic hydrocarbon? Why or why not?

Question illustration
A
Yes, because the carbon chain is made up of single bonds.
B
Yes, because the carbon chain is ring shaped.
C
No, because the carbon chain is composed of only a single ring.
D
No, because the carbon chain has no double bonds.
16

The compound below is estradiol, a hormone that triggers the development of female secondary sex characteristics. Estradiol is best described as which of the following?

Question illustration
A
an alkyne
B
an alkene
C
an alkane
D
an aromatic
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

How many isomers does hexane (C6H14) have?

A
four
B
five
C
six
D
seven
19

How does a straight-chain alkane that has five carbon atoms differ from a cycloalkane that has five carbon atoms?

A
The straight-chain alkane has at least one double or triple bond, but the cycloalkane has only single bonds.
B
The straight-chain alkane has only single bonds, but the cycloalkane has at least one double or triple bond.
C
The straight-chain alkane has two more hydrogen atoms than the cycloalkane.
D
The straight-chain alkane has two fewer hydrogen atoms than the cycloalkane.
20

The compound butanol has the following structural formula.Which of these is a structural isomer of butanol?

Question illustration
A
A string of 4 C atoms are bonded above, below, left and right to H.
B
A string of 4 C atoms is bonded above, below, left, and right to H, except the second C, which is bonded below to O, which is bonded below to H.
C
A string of 4 C atoms is bonded above, below, left, and right to H, but the chain is interrupted between the first and second C, which are bonded to an O between them.
D
A string of 4 C atoms is bonded above, below, and left to H, except the last C has no H below and is double-bonded to an O to the right.

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