General Chemistry
Principles & Modern Applications
9th Edition
Petrucci/Harwood/Herring/Madura
Chapter 3
Chemical Compounds
Dr. Travis D. Fridgen
Memorial University of Newfoundland
© 2007 Pearson Education
In the box to the right is (choose the best answer),
1. a formula unit of the ionic
compound acetylsalicylic acid.
2. a molecular model of the molecular
compound acetylsalicylic acid.
3. a structural formula for the ionic
compound acetylsalicylic acid.
Acetylsalicylic acid (aspirin)
4. a molecular formula for the molecular
compound acetylsalicylic acid.
5. an ionic compound with the empirical formula
C9O4H8.
In the box to the right is (choose the best answer),
1. a formula unit of the ionic
compound acetylsalicylic acid.
2. a molecular model of the molecular
compound acetylsalicylic acid.
3. a structural formula for the ionic
compound acetylsalicylic acid.
Acetylsalicylic acid (aspirin)
4. a molecular formula for the molecular
compound acetylsalicylic acid.
5. an ionic compound with the empirical formula
C9O4H8.
For the ball and stick model of naphthalene to the
right, the empirical formula is
1. C10H8
2. C4H5
3. C5H4
4. CH
For the ball and stick model of naphthalene to the
right, the empirical formula is
1. C10H8
2. C4H5
3. C5H4
4. CH
For the ball and stick model of pyrimidine to the
right, the molecular formula is,
1. C4N2H4
2. C2N2H2
3. C2NH2
4. (CH)4N2
For the ball and stick model of pyrimidine to the
right, the molecular formula is,
1. C4N2H4
2. C2N2H2
3. C2NH2
4. (CH)4N2
The molar mass of a compound (choose the
most correct answer)
1. is the mass of 6.022 x 1023 molecules of
the compound.
2. is the mass of 1 mole of molecules of
the compound.
3. is the same as the formula mass of the
molecule expressed in g mol-1.
4. All of the above.
5. both 1 and 2.
Edgar Fahs Smith Collection
University of Pennsylvania Library
The molar mass of a compound (choose the
most correct answer)
1. is the mass of 6.022 x 1023 molecules of
the compound.
2. is the mass of 1 mole of molecules of
the compound.
3. is the same as the formula mass of the
molecule expressed in g mol-1.
4. All of the above.
5. both 1 and 2.
Edgar Fahs Smith Collection
University of Pennsylvania Library
Without doing detailed calculations or using a calculator, which of the following
has the greatest number of oxygen atoms?
1. 0.5 moles of
oxygen.
oxygen
2. 6.022 x 1023
molecules of
water.
water
4. 0.5 moles of
glycerol.
3. 0.25 moles of
acetic acid.
acetic acid
glycerol
Without doing detailed calculations or using a calculator, which of the following
has the greatest number of oxygen atoms?
1. 0.5 moles of
oxygen.
oxygen
2. 6.022 x 1023
molecules of
water.
water
4. 0.5 moles of
glycerol.
3. 0.25 moles of
acetic acid.
acetic acid
glycerol
Without the use of a calculator, the molar mass
of ethanol, shown to the right, is
1. 29 u
2. 45 u
3. 45 g mol-1
4. 46 u
5. 46 g mol-1
1
6
8
H
C
O
1.00794
12.011
15.9994
Without the use of a calculator, the molar mass
of ethanol shown to the right is
1. 29 u
2. 45 u
3. 45 g mol-1
4. 46 u
5. 46 g mol-1
1
6
8
H
C
O
1.00794
12.011
15.9994
In one mole of the compound acetone (or
propanone), (CH3)2CO, how many grams
of carbon and hydrogen are there?
1. 12 g C, 1 g H
2. 12 g C, 3 g H
3. 24 g C, 3 g H
1
6
8
4. 24 g C, 6 g H
H
C
O
1.00794
12.011
15.9994
5. 36 g C, 6 g H
In one mole of the compound acetone (or
propanone), (CH3)2CO, how many grams
of carbon and hydrogen are there?
1. 12 g C, 1 g H
2. 12 g C, 3 g H
3. 24 g C, 3 g H
1
6
8
4. 24 g C, 6 g H
H
C
O
1.00794
12.011
15.9994
5. 36 g C, 6 g H
Given the molecular formulas of glucose and
dihydroxyacetone to the right, which of the
following statements is false?
1. The highest percentage by mass is
that of oxygen for both molecules.
glucose
C6H12O6
2. The empirical formulas for both
molecules is CH2O.
3. The percentages by mass of C and O are
the same as in carbon monoxide, CO.
4. The lowest percentage by mass is that of H.
5. There are twice as many hydrogen atoms as
oxygen atoms in both molecules.
dihydroxyacetone
C3H6O3
Given the molecular formulas of glucose and
dihydroxyacetone to the right, which of the
following statements is false?
1. The highest percentage by mass is
that of oxygen for both molecules.
glucose
C6H12O6
2. The empirical formulas for both
molecules is CH2O.
3. The percentages by mass of C and O are
the same as in carbon monoxide, CO.
4. The lowest percentage by mass is that of H.
5. There are twice as many hydrogen atoms as
oxygen atoms in both molecules.
dihydroxyacetone
C3H6O3
Which of the following compounds has the highest percentage
of carbon by mass?
1.
17
7A
9
3.
F
18.9984
17
chloromethane
2-iodoopropane
35.4527
35
4.
2.
Cl
Br
79.904
53
I
chloroethane
difluoromethane
126.904
Which of the following compounds has the highest percentage
of carbon by mass?
1.
17
7A
9
3.
F
18.9984
17
chloromethane
2-iodoopropane
35.4527
35
4.
2.
Cl
Br
79.904
53
I
chloroethane
difluoromethane
126.904
The oxidation number for N in nitric acid,
HNO3, is
1. 1
2. 2
3. 3
4. 4
5. 5
The oxidation number for N in nitric acid,
HNO3, is
1. 1
2. 2
3. 3
4. 4
5. 5
In acetic acid shown to the right, (choose the best
answer)
1. The carbon labeled “A” has a more positive
oxidation state than the one labeled “B”
A
2. The carbon labeled “B” has a more positive
oxidation state than the one labeled “A”
3. Both carbon atoms have the same
oxidation state.
4. Cannot assign oxidation states to these
carbon atoms.
acetic acid
B
In acetic acid shown to the right, (choose the best
answer)
1. The carbon labeled “A” has a more positive
oxidation state than the one labeled “B”
A
2. The carbon labeled “B” has a more positive
oxidation state than the one labeled “A”
3. Both carbon atoms have the same
oxidation state.
4. Cannot assign oxidation states to these
carbon atoms.
acetic acid
B
Potassium dichromate is used in breathalyzers.
When it comes in contact with alcohol vapour it
turns from orange to green. It is an ionic
compound where the polyatomic anion has the
formula Cr2O72-. What is the chemical formula
for potassium dichromate?
1. KCr2O7
2. K(Cr2O7)2
3. K2Cr2O7
4. K2(Cr2O7)3
5. K3(Cr2O7)2
POTASSIUM DICHRO
MATE
Potassium dichromate is used in breathalyzers.
When it comes in contact with alcohol vapour it
turns from orange to green. It is an ionic
compound where the polyatomic anion has the
formula Cr2O72-. What is the chemical formula
for potassium dichromate?
1. KCr2O7
2. K(Cr2O7)2
3. K2Cr2O7
4. K2(Cr2O7)3
5. K3(Cr2O7)2
POTASSIUM DICHRO
MATE
Sodium phosphate is an active component in
some constipation medicines and enemas. The
chemical formula for sodium phosphate is
1. NaPO4
2. Na2PO3
3. Na2PO4
4. Na3PO4
5. Na3(PO4)2
Sodium phosphate is an active component in
some constipation medicines and enemas. The
chemical formula for sodium phosphate is
1. NaPO4
2. Na2PO3
3. Na2PO4
4. Na3PO4
5. Na3(PO4)2
The names of the two structural isomers to the
right are:
A
1. A: 2-ethyl butane, B: 1,2-dimethyl butane
2. A: 3-ethyl butane, B: 2,3-dimethyl butane
3. A: 3-methyl pentane, B: 2,3-dimethyl butane
4. A: 3-methyl pentane, B: 2-isopropyl propane
5. A: butyl ethane, B: 2-isopropyl propane
B
The names of the two structural isomers to the
right are:
A
1. A: 2-ethyl butane, B: 1,2-dimethyl butane
2. A: 3-ethyl butane, B: 2,3-dimethyl butane
3. A: 3-methyl pentane, B: 2,3-dimethyl butane
4. A: 3-methyl pentane, B: 2-isopropyl propane
5. A: butyl ethane, B: 2-isopropyl propane
B
Which of the following compounds
to the right are structural isomers?
A
B
1. A and C only.
2. B and D only.
3. A, B and C only.
4. A, C and D only.
5. All are structural isomers.
C
D
Which of the following compounds
to the right are structural isomers?
A
B
1. A and C only.
2. B and D only.
3. A, B and C only.
4. A, C and D only.
5. All are structural isomers.
C
D
Upon complete combustion, some organic compounds can yield a
greater mass of H2O than CO2.
1. True
2. False
Upon complete combustion, some organic compounds can yield a
greater mass of H2O than CO2.
1. True
2. False