CHEM 120 EXAM 1
1. What term is used to describe the various spatial arrangements of a molecule
formed by rotation around carbon-carbon single bonds?
Answer : conformations
2. The carbonyl group (ketone) is a functional group found in many differenttypes
of compounds. What is the general structure of the carbonyl group (ketone)?
Answer : The general structure of the carbonyl group (ketone) is:
O
//
R-C
Where:
R represents an organic group (alkyl or aryl group) attached to the carbonyl carbon
(C).
The carbonyl group is a functional group consisting of a carbon-oxygen double
bond (C=O). In the case of a ketone, the carbonyl group is bonded to two other
carbon atoms (R groups) on either side. Ketones are a class of organic compounds
that contain this specific carbonyl functional group. Examples of ketones include
acetone (CH3COCH3), propanone (CH3COCH2CH3), and benzophenone
(C6H5CO(C6H5))
3. If you were to remove one carbon from the end of heptane, what would you
predict would happen to the melting point of the alkane?
Answer : The melting point would decrease
4. A cycloalkane molecule contains 9 carbon atoms. How many hydrogenatoms
are present in the molecule?
Answer : 18
5. What statement concerning propane and 2-propanol is false?
A) 2-propanol has stronger intermolecular forces than propane
B) Propane and 2-propanol are both organic compounds
,C) Propane is likely a gas at room temperature and 2-propanol is likely a liquidat
room temperature
D) Propane and 2-propanol are both hydrocarbons
E) 2-propanol has a higher boiling point than propane
Answer : D) Propane and2-propanol are both hydrocarbons
6. True or False: Pentane is an isomer of C5H12.
Answer : True
7. True or False: 2-methylbutane is an isomer of C5H12.
Answer : True
8. True or False: 2,2-dimethylpropane is an isomer of C5H12.
Answer : True
9. True or False: Cyclopentane is an isomer of C5H12.
Answer : False
10. Are organic or inorganic compounds typically not water soluble?
Answer : organic
11. Are organic or inorganic compounds often flammable?
Answer : organic
12. Do organic or inorganic compounds contain ionic bonds?
Answer : inorganic
13. Are organic or inorganic compounds typically have weak intermolecularforces?
Answer : organic
14. What is the structure of an ether?
Answer : The structure of an ether is as follows:
R-O-R'
, Where:
R and R' are organic groups (alkyl or aryl groups) attached to an oxygen atom (O)
by single covalent bonds.
Ethers are a class of organic compounds characterized by the presence of an oxygen
atom that is bonded to two carbon-containing groups. The oxygen atom is in the
center, and the two organic groups (R and R') are on either side. The oxygen-
carbon-oxygen arrangement gives ethers their distinct properties and makes them
different from other functional groups like alcohols and carbonyl compounds. An
example of an ether is ethyl methyl ether (CH3OCH2CH3).
15. Are alkenes saturated or unsaturated? Why?
Answer : Alkenes are unsaturated be- cause they could hold more hydrogen if the
double bond was broken
16. What is an alkene?
Answer: a hydrocarbon with a carbon-carbon double bond
17. True or False: Water can hydrogen bond.
Answer: True
18. True or False: Sodium chloride can hydrogen bond.
Answer: False
19. True or False: 1,3-cyclopentadiene can hydrogen bond.
Answer: False
20. True or False: 3-ethylhexane can hydrogen bond.
Answer: False
21. What is a four-carbon alkane called?
Answer: butane
22. What is a constitutional isomer?
Answer: same molecular formula but different connectivity
1. What term is used to describe the various spatial arrangements of a molecule
formed by rotation around carbon-carbon single bonds?
Answer : conformations
2. The carbonyl group (ketone) is a functional group found in many differenttypes
of compounds. What is the general structure of the carbonyl group (ketone)?
Answer : The general structure of the carbonyl group (ketone) is:
O
//
R-C
Where:
R represents an organic group (alkyl or aryl group) attached to the carbonyl carbon
(C).
The carbonyl group is a functional group consisting of a carbon-oxygen double
bond (C=O). In the case of a ketone, the carbonyl group is bonded to two other
carbon atoms (R groups) on either side. Ketones are a class of organic compounds
that contain this specific carbonyl functional group. Examples of ketones include
acetone (CH3COCH3), propanone (CH3COCH2CH3), and benzophenone
(C6H5CO(C6H5))
3. If you were to remove one carbon from the end of heptane, what would you
predict would happen to the melting point of the alkane?
Answer : The melting point would decrease
4. A cycloalkane molecule contains 9 carbon atoms. How many hydrogenatoms
are present in the molecule?
Answer : 18
5. What statement concerning propane and 2-propanol is false?
A) 2-propanol has stronger intermolecular forces than propane
B) Propane and 2-propanol are both organic compounds
,C) Propane is likely a gas at room temperature and 2-propanol is likely a liquidat
room temperature
D) Propane and 2-propanol are both hydrocarbons
E) 2-propanol has a higher boiling point than propane
Answer : D) Propane and2-propanol are both hydrocarbons
6. True or False: Pentane is an isomer of C5H12.
Answer : True
7. True or False: 2-methylbutane is an isomer of C5H12.
Answer : True
8. True or False: 2,2-dimethylpropane is an isomer of C5H12.
Answer : True
9. True or False: Cyclopentane is an isomer of C5H12.
Answer : False
10. Are organic or inorganic compounds typically not water soluble?
Answer : organic
11. Are organic or inorganic compounds often flammable?
Answer : organic
12. Do organic or inorganic compounds contain ionic bonds?
Answer : inorganic
13. Are organic or inorganic compounds typically have weak intermolecularforces?
Answer : organic
14. What is the structure of an ether?
Answer : The structure of an ether is as follows:
R-O-R'
, Where:
R and R' are organic groups (alkyl or aryl groups) attached to an oxygen atom (O)
by single covalent bonds.
Ethers are a class of organic compounds characterized by the presence of an oxygen
atom that is bonded to two carbon-containing groups. The oxygen atom is in the
center, and the two organic groups (R and R') are on either side. The oxygen-
carbon-oxygen arrangement gives ethers their distinct properties and makes them
different from other functional groups like alcohols and carbonyl compounds. An
example of an ether is ethyl methyl ether (CH3OCH2CH3).
15. Are alkenes saturated or unsaturated? Why?
Answer : Alkenes are unsaturated be- cause they could hold more hydrogen if the
double bond was broken
16. What is an alkene?
Answer: a hydrocarbon with a carbon-carbon double bond
17. True or False: Water can hydrogen bond.
Answer: True
18. True or False: Sodium chloride can hydrogen bond.
Answer: False
19. True or False: 1,3-cyclopentadiene can hydrogen bond.
Answer: False
20. True or False: 3-ethylhexane can hydrogen bond.
Answer: False
21. What is a four-carbon alkane called?
Answer: butane
22. What is a constitutional isomer?
Answer: same molecular formula but different connectivity
