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CHEM 120 Exam 1 (Latest -
Actual Questions and Answers 100% Correct
- What is an alkene?
Answer: a hydrocarbon with a carbon-carbon double bond
2. True or False: Water can hydrogen bond.
Answer: True
3. True or False: Sodium chloride can hydrogen bond.
Answer: False
4. True or False: 1,3-cyclopentadiene can hydrogen bond.
Answer: False
5. True or False: 3-ethylhexane can hydrogen bond.
Answer: False
- What is a four-carbon alkane called?
Answer: butane
- What is a constitutional isomer?
Answer: same molecular formula but different connectivity
8. What is an example of a primary alkyl group?:
Answer An example of a primary alkyl group is the methyl group (-CH3).
- What is an example of a secondary alkyl group?
Answer: An example of a secondary alkyl group is the ethyl group (-CH2CH3).
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- What is an example of a tertiary alkyl group?
Answer An example of a tertiary alkyl group is the isopropyl group (also known as 1-methylethyl group) represented as (-CH(CH3)2).
- What is an example of a quaternary alkyl group?
Answer:A quaternary alkyl group refers to a carbon atom that is bonded to four
other carbon or alkyl groups. An example of a quaternary alkyl group is the trimethylammonium group, represented as (-N(CH3)3+).
- What does an eclipsed conformation look like?
Answer In organic chemistry, an eclipsed conformation is a specific arrangement of atoms in a molecule, particularly in the context of acyclic (open-chain) compounds like alkanes. It occurs when two adjacent atoms or groups are in line with each other, leading to a less stable configuration due to increased torsional strain.
An example of an eclipsed conformation can be observed in ethane (C2H6) where two carbon atoms are bonded together with a single bond (C-C). In the eclipsed conformation of ethane, the two hydrogen atoms on one carbon are directly aligned with the two hydrogen atoms on the other carbon, creating a staggered arrangement
- What is not a typical bonding pattern of carbon atoms in organic com- pounds?
Answer A not typical bonding pattern of carbon atoms in organic compounds is a quadruple bond (also known as a tetra-covalent bond) between two carbon atoms. In organic chemistry, carbon-carbon bonds are typically single (sigma bond), double (sigma and pi bond), or triple (sigma and two pi bonds) bonds. Quadruple bonds between two carbon atoms are extremely rare and not commonly observed in organic compounds. The formation of such quadruple bonds would require significant energy and stability considerations, making them highly unlikely in most organic molecules.
- Which type of bond forms when an electron is transferred from 1 atom to
another?
Answer : ionic
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- Which type of bond involves unequal sharing of electrons between atoms?
Answer : polar covalent
- How does an alkyl group differ from its parent alkane?
Answer : An alkyl group contains one less hydrogen atom than its parent alkane
- What term is used to describe the various spatial arrangements of a molecule
formed by rotation around carbon-carbon single bonds?
Answer : conformations
- The carbonyl group (ketone) is a functional group found in many different types
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))
- 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
- A cycloalkane molecule contains 9 carbon atoms. How many hydrogen atoms
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are present in the molecule?
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