AnswersHSBIO Biology Sem 1 26-27Organic Compounds

Lesson 2: Organic Compounds Answers

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1
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Which of the following best explains why a structural formula of a chemical compound is more useful than a molecular formula?

A
Both formulas identify the specific atoms in a particular compound. However, a structural formula also shows how the atoms in a compound are bonded together.
B
Both formulas identify the types of atoms in a particular compound. However, a structural formula also shows how many atoms of each type are in a compound.
C
Both formulas show the location of each valence electron in a particular compound. However, a structural formula also shows the ratio of protons to neutrons within a compound.
D
Both formulas show the ratio of protons to neutrons within a particular compound. However, a structural formula also shows the location of each valence electron in a compound.
2
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Gina wants to use models to better understand how the types of bonds in a molecule relate to the presence of geometric isomers. Which model would be most helpful in her research?

A
the space-filling model
B
the structural formula
C
the molecular formula
D
the ball-and-stick model
3

A student states that this structural formula represents a hydrocarbon.Is the student correct?

Question illustration
A
Yes, a hydrocarbon is any compound that contains a carbon backbone.
B
Yes, a hydrocarbon is any compound that contains hydrogen and oxygen.
C
No, a hydrocarbon contains only carbon and hydrogen atoms.
D
No, a hydrocarbon contains at least one double or triple bond.
4

Which of the following best describes a possible carbon compound?

A
One carbon atom forms a quadruple bond with another carbon atom.
B
One carbon atom forms a double bond with an oxygen atom and two single bonds with two hydrogen atoms.
C
One carbon atom forms five single bonds with five hydrogen atoms.
D
One carbon atom forms a triple bond with another carbon atom and a double bond with an oxygen atom.
5

How many covalent bonds can a typical carbon atom form?

A
one
B
two
C
three
D
four
6

Which of the following is an organic compound?

A
ammonia (NH3)
B
calcium sulfide (CaS)
C
octane (C8H18)
D
sulfur trioxide (SO3)
7

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.
Option A
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.
Option B
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.
Option C
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.
Option D
8

Which best explains the difference between a ball-and-stick model of a chemical compound and a space-filling model?

A
Ball-and-stick models can show compounds in three dimensions, but space-filling models cannot.
B
Space-filing models can show compounds in three dimensions, but ball-and-stick models cannot.
C
Ball-and-stick models show the bonds between atoms, but not the relative sizes of atoms. Space-filling models show the relative sizes of atoms, but not the bonds between atoms.
D
Space-filling models show the bonds between atoms, but not the relative sizes of atoms. Ball-and-stick models show the relative sizes of atoms, but not the bonds between atoms.
9

Which molecular formula corresponds to this model of a chemical compound? (black = carbon; red = oxygen; white = hydrogen)

Question illustration
A
C2(OH)4
B
C2H2O4
C
C2H4O2
D
C4H2O2
10

Roberto examines two molecular models. He sees that the atoms are the same in each model and are attached in the same order in each model. However, he cannot make the models appear the same without breaking a double bond. What do the models represent?

A
two structural isomers that have the same molecular formula
B
two geometric isomers that have the same molecular formula
C
two organic compounds that have the same structural formula
D
two models of a single organic compound

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