CHEM 109 Lecture Exam 2
When two compounds are made up of the same number and kind of atoms, but differ in their molecular structure they are known as:
isomers
A carbohydrate with 6 carbons and a ketone functional group is called a(n):
ketohexose
Fructose is called a(n)
ketohexose
A carbohydrate with a ketone functional group is called:
ketose
The fatty acid that contains 2 double bonds is
linoleic acid
The fatty acid that is called an omega-6 fatty acid is:
linoleic acid
The fatty acid that is called an omega-3 fatty acid is:
linolenic acid
This disaccharide is also known as malt sugar since it is formed from the breakdown of starch and is a key ingredient in beer:
maltose
Which of the following is a structural isomer of 2-methylbutane?
n-pentane
Which of the following is a polysaccharide?
starch, glycogen, cellulose
Which of the following is a non-reducing sugar?
sucrose
Which of the following is a disaccharide?
sucrose, lactose, maltose
How many chiral carbon atoms are in this molecule?
0
Among the following compounds which are isomers?
1 and 2
What is the coefficient for O2 when the equation for the combustion of C4H10 to CO2 and H2O is balanced?
13
How many carbon atoms are in a molecule of palmitic acid?
16
How many chiral carbon atoms are there in this molecule?
2
How many chiral carbon atoms are in this structure?
CH2-OH-CH-OH-CH-Br-CHCH3-Cl
Which of the following is the structure for stearic acid?
CH3(CH2)16COOH
What is the correct condensed structural formula for this skeletal structure?
CH3(CH2)7CH3
Which of the following is the structure of oleic acid?
CH3(CH2)7CH=CH(CH2)7COOH
Which of the following is a primary alcohol?
CH3CH2-CH-CH2CH2CH3- CH2CH2CH2OH
Which of the following is a secondary alcohol?
CH3CH2-CH-OH-CH3
Which of the following is a secondary alcohol?
CH3CH2-CH-OH-CH3-
What is the correct name for the following compound?
CH3CH2CH2-CHCH3-Cl also called 2-chloropentane
Which of the following is the correct condensed structural formula for octane?
CH3CH2CH2CH2CH2CH2CH2CH3
What is the most likely product of hydration of CH3CH=CH2?
CH3CHOHCH3
Which of these reactions is a double displacement reaction?
CH3COOH(aq) + K2CO3(aq) → H2O(l) + CO2(g) + KCH3COO(aq)
Which of the following functional groups is just a carbon double bonded to an oxygen atom?
Carbonyl
Which of the following is the structural polysaccharide in plants?
Cellulose
The general formula for a carbohydrate is:
Cn(H2O)n
All members of the alkene series of hydrocarbons have the general formula:
CnH2n
Which blood type contains the carbohydrate N-acetylgalactosamine?
Type A
Which of the following blood types is considered to be the universal blood donor?
Type O
How many monosaccharides are connected to each other in a disaccharide?
di - 2
What type of nutrient has the highest energy content per gram?
fat
A compound that is composed of only carbon and hydrogen is known as a(n):
hydrocarbon
Which of the following is a primary alcohol?
(Answer on Paper)
Which of the following structures is cyclopentane?
(Answer on Paper)
Which of these molecules is saturated
(Answer on Paper)
What is the correct skeletal structure for hexane?
(answer on paper)
Which of the following are enzyme-based diseases?
- Gout - Lactose Intolerance - Phenylketonuria All of the above
Which of the following factors influence the rate of a reaction?
- temperature - reactant concentration - a catalyst all of the above
In the Benedict's test:
-an aldehyde is oxidized -a brick red precipitate is formed -the copper (II) ion is reduced all the above
What is the IUPAC name for the following structure?
1-chloro-2-ethyl cyclohexane
Glyceraldehyde is a carbohydrate that contains ________ carbon atoms.
3
How many chiral carbon atoms are in this molecule?
3
How many monosaccharides are connected to each other in an oligosaccharide?
3 to 9
Which of the following alkenes shows cis-trans isomerism?
3-octene
How many carbon atoms are in a butane molecule?
4
How many isomers are there of hexane, C6H14?
5
How many stereoisomers are possible for
8
How many stereoisomers are possible for:
8
What is the coefficient for O2 when the equation for the combustion of C5H12 to CO2 and H2O is balanced?
8
Which of these carbohydrates shown in the Fischer projection is D-galactose?
A
Which of these molecules is the enantiomer of D-altrose?
A
Which of the following processes is nonspontaneous?
A battery being recharged
Which of the following functional groups comprises a carbon atom bonded to a hydroxyle group?
Alcohol
Which of these formulas corresponds to that of a straight-chain alkane?
C5H12
Which of these hydrocarbons could not be a cycloalkane?
C6H14
What functional groups are present in the following structure? CH3—C≡C—CH2OH
An alcohol and an alkyne
Which of the following compounds is the enantiomer of the following?
B
Which of these molecules is not an isomer of the others?
C
Which one of these molecules is an epimer of D-allose?
C
The substance that precipitates in a positive Benedict test is:
Cu2O
Which of the following molecules would yield this product when hydrated?
D all of the above
Which of the following actions would not increase the rate of a reaction?
Diluting the reactants by a factor of 2
Which of the following is the storage form of glucose in the liver and muscle tissue?
Glycogen
The compound CH3(CH2)5CH3 is called:
Heptane
The compound CH3(CH2)4CH3 is called:
Hexane
The name of the following alkyl group is:
Isopropyl
Which of the following fatty acids is an essential fatty acid?
Linoleic acid
An enzyme increases the rate of a biological process in what way?
Lowers the activation energy of the process
Which fatty acid is a saturated fatty acid?
Myristic acid
If this is the reduced form of NADH which of the following is the oxidized form of this important biomolecule?
NAD+
Which of the following is an aldehyde functional group?
NOT OH JUST H
Which of these functional groups is a thiol?
R-S-H
Which of these molecules is a tertiary amine?
R3N
Determine which of the statements is incorrect regarding this figure:
Reaction II occurs faster than reaction I.
What statement is incorrect about this oxidation-reduction reaction? 2 SO2(g) + O2(g) → 2 SO3(g)
SO2 gains electrons.
The configuration at which carbon atom determines if a monosaccharide is D or L?
The highest numbered chiral carbon
What is the correct name for the following structure?
Trans-dichlorocyclopentane
The minimum energy that reactants need in order for the molecules to be in the correct orientation is called:
activation energy
Hydrogenation of an alkene is an example of what kind of reaction?
addition
Identify the correct sequence of substances in degree of oxidation.
alcohol → aldehyde → carboxylic acid
A carbohydrate with 6 carbons and an aldehyde functional group is called a(n):
aldohexose
Galactose is called a(n)
aldohexose
A carbohydrate with an aldehyde functional group is called:
aldose
A molecule that has both polar and nonpolar parts is said to be:
amphipathic
In the Benedict's test
an aldehyde is oxidized
α-D-glucose and β-D-glucose are:
anomers
Which of these polysaccharides is not made exclusively from α-glucose units
cellulose
Which one of these polysaccharides is not used in energy storage?
cellulose
The polysaccharide the makes up the exoskeleton of insects is:
chitin
Which one of these polysaccharides contains β-N-acetylglucosamineunits forming β(1→4) bonds?
chitin
What is the IUPAC name for the following structure?
cis-1,2-dimethyl cyclohexane
In what type of reaction are there more reactant substances than product substances?
combination
In what type of reaction are there more product substances than reactant substances?
decomposition
What type of reaction is illustrated in this diagram?
decomposition
A solution of sodium chloride when added to a solution of silver nitrate produces a white precipitate of silver chloride. What type of reaction is it?
double displacement
Glucose and galactose are ________ of each other.
epimers
The name of the following alkyl group is: CH3CH2-
ethyl
Lactose is made from D-glucose and:
galactose
The most abundant monosaccharide in nature is:
glucose
A fast reaction rate for a chemical reaction is dependent on:
having a small activation energy
When an organic molecule loses hydrogens it is said to be:
oxidized
When a substance is reduced it is called a(n):
oxidizing agent
A carbohydrate with 5 carbons is called a
pentose
What types of alcohols are found in carbohydrates?
primary + secondary
Which of these molecules is an ester?
r-c=o-or
When an organic molecule gains hydrogens it is said to be:
reduced
When a substance is oxidized it is called a(n):
reducing agent
A piece of zinc placed in hydrochloric acid results in a fierce effervescence and the zinc eventually dissolves, yielding a solution of zinc chloride. A glowing splint gives a "popping" sound, indicating the presence of hydrogen gas. What type of reaction is it?
single displacement
What type of reaction is illustrated in this diagram?
single displacement
a carbohydrate with 4 carbons is called a:
tetrose
For a reaction to be exothermic or endothermic it is determined by:
the overall loss or gain of energy when the bonds break and reform
What is the relationship between the following molecules?
they are identical
What type of glycosidic bond is shown here?
α(1→6)
The glycosidic bond that connects the two monosaccharides in sucrose is:
α,β(1→2)
The glycosidic bond that connects the two monosaccharides in lactose is:
β(1→4)
What type of glycosidic bond is shown here?
β(1→4)
