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When fat drips onto charcoal or a very hot surface, ___ can lead to the formation of polycyclic aromatic hydrocarbons.
Answer: Blank 1: incomplete combustion.
Fat contacting charcoal or a very hot surface can undergo incomplete combustion, forming polycyclic aromatic hydrocarbons.
How many fused aromatic rings does benzo[a]pyrene have?
Answer: Value: 5 fused aromatic rings (exact, no tolerance).
Benzo[a]pyrene has five fused rings; it is structurally derived from pyrene by adding a fused benzene ring.
Which effects have been linked to frequent exposure to certain polycyclic aromatic hydrocarbons? Select all that apply.
Answer: Genotoxic effects · Carcinogenic effects
Frequent exposure to certain polycyclic aromatic hydrocarbons has been linked to both genotoxic and carcinogenic effects.
Anthracene and phenanthrene each have three fused aromatic rings. How can their ring arrangements be distinguished?
Answer: Anthracene's rings are arranged linearly, whereas phenanthrene's rings are arranged angularly.
Ring arrangement distinguishes these compounds even though both have three fused rings and the same molecular formula.
What structural feature distinguishes a polycyclic aromatic hydrocarbon from a single-ring aromatic compound?
Answer: Multiple aromatic rings that share carbon atoms
Polycyclic aromatic hydrocarbons contain fused aromatic rings, meaning the rings share carbon atoms.
Which pair of polycyclic aromatic hydrocarbons has the same molecular formula despite having different structures?
Answer: Anthracene and phenanthrene
Anthracene and phenanthrene share a molecular formula but differ in structure.
How many fused aromatic rings does pyrene contain?
Answer: Value: 4 rings (exact, no tolerance).
Pyrene is a polycyclic aromatic hydrocarbon with four fused aromatic rings.
In the name benzo[a]pyrene, the letter [a] specifies the ___ at which the additional ring is fused.
Answer: Blank 1: position (also accept: fusion position).
The bracketed letter identifies the position where the additional ring is fused.
Which processes can give meat cooked over a grill or wood fire its characteristic aromas and sensory qualities?
Answer: High temperatures, pyrolysis, and the combustion of fats and organic matter.
These cooking conditions and processes contribute to the meat's aromas and other sensory characteristics.
Which aromatic hydrocarbon consists of two fused benzene rings?
Answer: Naphthalene
Naphthalene has two fused benzene rings; the other listed compounds have three or four fused rings.
Compared with anthracene and phenanthrene, pyrene has a ___ fused-ring structure.
Answer: Blank 1: more compact.
Pyrene's structure is described as more compact than those of anthracene and phenanthrene.
Which molecular formula corresponds to benzo[a]pyrene?
Answer: $C_{20}H_{12}$
The molecular formula of benzo[a]pyrene is $C_{20}H_{12}$.
Which conclusions about aromatic compounds and nonstick fluoropolymers are justified? Select all that apply.
Answer: Not every nonstick material should be classified as a benzene derivative. · Aromatic compounds and fluoropolymers do not necessarily belong to the same chemical family.
A nonstick coating should not automatically be treated as a benzene derivative: aromatic compounds and fluoropolymers do not necessarily share a chemical family.
What structural change connects pyrene to benzo[a]pyrene?
Answer: An additional benzene ring is fused to the pyrene structure.
Benzo[a]pyrene is structurally derived from pyrene by incorporating another fused benzene ring.
A compound is identified as naphthalene. Which molecular formula belongs to it?
Answer: $C_{10}H_8$
Naphthalene has the molecular formula $C_{10}H_8$.
When the $\mathrm{-OH}$ group is the principal functional group, the compound is normally an ___ and its name uses the suffix ___.
Answer: Blank 1: alcohol. Blank 2: -ol.
A principal hydroxyl group normally identifies an alcohol, whose name uses the suffix -ol.
What is the name of the compound with formula $\mathrm{C_6H_5NO_2}$?
Answer: Nitrobenzene
The $\mathrm{-NO_2}$ substituent gives this benzene derivative the name nitrobenzene.
Give both the common name and the systematic name of $\mathrm{C_6H_5NH_2}$.
Answer: Common name: aniline. Systematic name: benzenamine.
The compound has an amino group attached to a benzene ring; its common name is aniline and its systematic name is benzenamine.
A compound has a terminal $\mathrm{-CHO}$ group. Which suffix is generally used to name its functional class?
Answer: -al
A terminal $\mathrm{-CHO}$ group identifies an aldehyde, which is generally named with the suffix -al.
A molecule contains the $\mathrm{-COOH}$ group. Which two descriptions apply to it?
Answer: It contains a carboxyl group. · It belongs to the carboxylic acid class.
The $\mathrm{-COOH}$ group is called carboxyl and identifies a carboxylic acid, not an aldehyde or nitro group.
When the $\mathrm{-NH_2}$ group acts as a substituent, its naming prefix is ___.
Answer: Blank 1: amino-.
The amino group is related to amines, and amino- is its prefix when it acts as a substituent.
What is the systematic name of a benzene ring bearing one methyl group?
Answer: Methylbenzene
A benzene ring with a methyl substituent is methylbenzene, commonly called toluene.
What is the systematic name of $\mathrm{CH_3CH_2COOH}$?
Answer: Propanoic acid.
The three-carbon carboxylic acid is named propanoic acid.
Which statements correctly describe the structure of an aldehyde group?
Answer: It can be written as $\mathrm{-CHO}$. · Its carbon has a double bond to oxygen and a bond to hydrogen.
An aldehyde has the structure $\mathrm{R-C(=O)H}$: its carbon is double-bonded to oxygen and bonded to hydrogen. The group is written $\mathrm{-CHO}$, not $\mathrm{-COH}$.
In the name benzo[a]pyrene, what does the letter [a] specify?
Answer: The position where the additional ring is fused
The bracketed letter identifies the fusion position of the additional ring; it does not give an atom count or identify a functional group.
The $ mathrm{-NH_2}$ group is associated with which class of compounds?
Answer: Amines
The amino group is associated with amines.
Which formulas are examples of carboxylic acids? Select all that apply.
Answer: $ mathrm{HCOOH}$ · $ mathrm{CH_3COOH}$
$ mathrm{HCOOH}$ and $ mathrm{CH_3COOH}$ contain the carboxyl group, $ mathrm{-COOH}$. The other two formulas are aldehydes.
Which statement correctly distinguishes fluoropolymers used in nonstick coatings from aromatic compounds?
Answer: They do not necessarily belong to the same chemical family.
A fluoropolymer coating should not automatically be classified as an aromatic compound or a benzene derivative.
When the $ mathrm{-NO_2}$ group is named as a substituent, its prefix is ___.
Answer: Blank 1: nitro- (also accept: nitro).
The $ mathrm{-NO_2}$ group uses the prefix nitro-.
What is the name of the aldehyde $ mathrm{CH_3CHO}$?
Answer: Ethanal.
$ mathrm{CH_3CHO}$ is named ethanal.
A benzene ring bearing a methyl group is called ___.
Answer: Blank 1: toluene (also accept: methylbenzene).
Toluene is a benzene derivative with a methyl group attached to the ring; methylbenzene is its systematic name.
A naphthalene molecule has two aromatic rings that share a side. How many fused aromatic rings does it contain?
Answer: Value: 2 rings (exact, no tolerance).
Naphthalene consists of two fused benzene rings, which share a side.
Which health effects are associated with exposure to benzene vapors? Select all that apply.
Answer: Damage to bone marrow · Disruption of blood-cell production
Benzene vapor exposure is a serious health hazard linked to bone marrow damage and impaired blood-cell production, including leukemia.
A worker frequently exposed to toluene vapors reports dizziness and memory problems. Which body system may be affected?
Answer: The central nervous system.
Toluene can affect the central nervous system and cause dizziness and memory disturbances.
Which compounds belong to the group known as BTX? Select all that apply.
Answer: Benzene · Toluene · Xylene
BTX refers to benzene, toluene, and xylene.
What structural feature characterizes a polycyclic aromatic hydrocarbon?
Answer: Several fused aromatic rings
Polycyclic aromatic hydrocarbons contain multiple aromatic rings fused together by shared carbon atoms.
Are fluoropolymer nonstick coatings necessarily benzene derivatives?
Answer: No. Fluoropolymers are not necessarily benzene derivatives; they do not necessarily belong to the same chemical family as aromatic compounds.
A nonstick coating should not be classified as a benzene derivative merely because it is a fluoropolymer.
How many alternating double bonds are in a benzene ring?
Answer: Value: 3 double bonds (exact, no tolerance).
A benzene ring has six carbon atoms and three alternating double bonds.
The molecular formula of toluene is ___.
Answer: Blank 1: C₇H₈ (also accept: C7H8).
Toluene has seven carbon atoms and eight hydrogen atoms.
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