Chemistry Test 4-3 (May)
Please use the answer sheet. Thank you!
Multiple Choice (60%)
1)
Please consider a 5.00-mL sample of lead with a density of 11.4 g/mL and a 5.00-mL sample of
gold with a density of 19.2 g/mL. Please choose all true statements.
A)
B)
C)
D)
E)
2)
A sample of a solution has more water added to it. Which one is true?
A)
B)
C)
D)
3)
The gold has a smaller volume than the lead.
The gold has the same mass as the lead.
The gold contains fewer atoms than the lead.
The gold has a greater mass than the lead.
None of these are true.
The molarity increases because solvent has been added.
The molarity increases because solute has been added.
The molarity decreases because solvent has been added.
The molarity decreases because solute has been added.
Which one occurs when a seed crystal is dropped into a supersaturated solution?
A)
B)
C)
D)
It dissolves and then precipitates.
It dissolves and remains dissolved.
It falls to the bottom and remains undissolved.
It causes dissolved solute to precipitate.
4)
A solution has [H+] = 4.71 X 10–3. What is the pH?
5)
A solution has [OH–] = 2.50 X 10–4. What is the pH?
6)
Please choose all compounds with ionic bonds.
A)
C)
E)
7)
K2S
CO2
As2O3
CaCl2
Br2
B)
D)
SO2
Ni(ClO2)2
Which one is an example of a cation that is isoelectronic with Kr?
A)
9)
B)
D)
Please choose all compounds with covalent bonds.
A)
C)
E)
8)
P4O6
O2
(NH4)2(SO4)
Br+
B)
Y3–
C)
Se2+
D)
Sr2–
E)
Y3+
Which one is an example of an anion that is isoelectronic with Ne?
A)
Al3+
B)
F2–
C)
O2–
D)
Mg2–
E)
F+
10)
What is the name for H3P ?
A)
C)
11)
B)
D)
HSO4
HSO3
Concentrated with a high molarity
Dilute with a high molarity
B)
D)
Concentrated with a low molarity
Dilute with a low molarity
pH 8 = weak base
pH 14 = strong base
pH 1 = weak acid
B)
D)
pH 14 = strong acid
pH 6 = strong acid
Which one will decrease the solubility of a gaseous solute in water?
A)
B)
C)
D)
15)
H2S
H2SO4
H2SO3
Please choose all that are matched correctly.
A)
C)
E)
14)
Phosphoric acid
Hydrophosphoric acid
Which one best describes a solution with a large mass of solvent and a small mass of solute?
A)
C)
13)
B)
D)
Which one is the formula for sulfurous acid?
A)
C)
E)
12)
Phosphorous acid
Hydrophosphorous acid
Increase the temperature and increase the pressure
Increase the temperature and decrease the pressure
Decrease the temperature and increase the pressure
Decrease the temperature and decrease the pressure
Which one will decrease the solubility of a solid solute in water?
A)
B)
C)
D)
Increase the temperature and increase the surface area
Increase the temperature and decrease the surface area
Decrease the temperature and increase the surface area
Decrease the temperature and decrease the surface area
16)
What is the empirical formula for C6H15 ?
17)
A compound has an empirical formula C2H5 and a molar mass of 116.28 g. What is the molecular
formula?
18)
Which atom would we predict to have the greatest electron affinity?
A)
B)
C)
D)
One with many protons and many electron clouds
One with few protons and many electron clouds
One with many protons and few electron clouds
One with few protons and few electron clouds
Please consider the Lewis dot diagram for SO32– for questions 19-21.
19)
Which one best describes the central atom in HCO– ?
A)
B)
C)
D)
20)
What is the electronic geometry for HCO– ?
A)
C)
E)
21)
B)
C)
D)
Trigonal planar
Trigonal pyramidal
Linear
B)
D)
Tetrahedral
Bent
The O atom has a smaller ionization energy because it has fewer protons and more electron
clouds.
The F atom has a greater ionization energy because it has more protons and the same
number of electron clouds.
The O atom has a larger radius because it has fewer protons and the same number of
electron clouds.
The F atom has a greater ionization energy because it has more protons and fewer electron
clouds.
K
B)
Cu
C)
Ca
D)
Kr
E)
Br
Which one has the largest radius?
A)
25)
Tetrahedral
Bent
Which one has the smallest atomic radius?
A)
24)
B)
D)
Please consider an atom of oxygen and an atom of fluorine. Please choose all correct statements.
A)
23)
Trigonal planar
Trigonal pyramidal
Linear
What is the molecular geometry for HCO– ?
A)
C)
E)
22)
2 bonding pairs of electrons and 0 lone pairs
3 bonding pairs of electrons and 1 lone pair
3 bonding pairs of electrons and 0 lone pairs
2 bonding pairs of electrons and 1 lone pair
Si4–
B)
Cl–
C)
K+
D)
Ar
E)
Sc3+
Please choose all molecules that would be polar covalent.
A)
B)
C)
D)
Trigonal planar electronic geometry and bent molecular geometry
Tetrahedral electronic geometry and trigonal pyramidal molecular geometry
Tetrahedral electronic geometry and tetrahedral molecular geometry
Tetrahedral electronic geometry and bent molecular geometry
26)
D
T (oC)
E
C
B
A
Heat (J)
Please choose all true statements.
A)
B)
C)
D)
E)
D represents heat of fusion and heat of vaporization.
B represents heat of solidification and heat of condensation.
C represents liquid H2O boiling.
E represents steam being heated.
A represents ice being melting.
27)
What is the ending electron configuration for As2– ?
28)
Please choose all that have identical atoms as the representative particle.
A)
C)
E)
29)
B)
D)
Helium
Sand (SiO2)
Please choose all true statements.
A)
B)
C)
D)
E)
30)
14 kt gold
24 kt gold
Air
The boiling point of water is 0oC.
Heat of condensation = +q.
Heat of fusion = –q.
Heat of solidification = –q.
The melting point of ice is 0oC.
Please use the attached solubility graph. When a saturated solution of NaNO3 in 100 g H2O is
heated from 10oC to 35oC, what additional mass of NaNO3 will dissolve in the solution to keep the
solution saturated?
Problems (40%)
Please show all your work for any credit!
1)
How many ppies are in 3.70 X 10–13 kpies?
2)
How many MJ are in 94.0 cJ?
3)
What is the % yield oxygen?
2 Al(ClO3)3 (s)  2 AlCl3 (s) + 9 O2 (g)
Mass of crucible
Mass of crucible + Al(ClO3)3
60.00 g
64.67 g
Mass of crucible after heating
62.94 g
4)
A compound contains 33.138 g carbon, 3.716 g hydrogen & 44.147 g oxygen. What is its
empirical formula?
5)
A 47.8-g sample of aluminum has an initial temperature of 7.0oC. It loses 563 J of heat. What is
the final temperature of the sample? The specific heat capacity of aluminum is 0.900 J/goC.
Chemistry Test 4-3 (Flowers)
Please use the answer sheet. Thank you!
Multiple Choice (60%)
1)
Please consider a 5.00-mL sample of lead with a density of 11.4 g/mL and a 5.00-mL sample of
gold with a density of 19.2 g/mL. Please choose all true statements.
A)
B)
C)
D)
E)
2)
A sample of a solution has more water added to it. Which one is true?
A)
B)
C)
D)
3)
The gold has a smaller volume than the lead.
The gold has the same mass as the lead.
The gold contains fewer atoms than the lead.
The gold has a greater mass than the lead.
None of these are true.
The molarity increases because solvent has been added.
The molarity increases because solute has been added.
The molarity decreases because solvent has been added.
The molarity decreases because solute has been added.
Which one occurs when a seed crystal is dropped into a supersaturated solution?
A)
B)
C)
D)
It dissolves and then precipitates.
It dissolves and remains dissolved.
It falls to the bottom and remains undissolved.
It causes dissolved solute to precipitate.
4)
A solution has [H+] = 4.71 X 10–3. What is the pH?
5)
A solution has [OH–] = 2.50 X 10–4. What is the pH?
6)
Please choose all compounds with ionic bonds.
A)
C)
E)
7)
K2S
CO2
As2O3
CaCl2
Br2
B)
D)
SO2
Ni(ClO2)2
Which one is an example of a cation that is isoelectronic with Kr?
A)
9)
B)
D)
Please choose all compounds with covalent bonds.
A)
C)
E)
8)
P4O6
O2
(NH4)2(SO4)
Br+
B)
Y3–
C)
Se2+
D)
Sr2–
E)
Y3+
Which one is an example of an anion that is isoelectronic with Ne?
A)
Al3+
B)
F2–
C)
O2–
D)
Mg2–
E)
F+
10)
What is the name for H3P ?
A)
C)
11)
B)
D)
HSO4
HSO3
Concentrated with a high molarity
Dilute with a high molarity
B)
D)
Concentrated with a low molarity
Dilute with a low molarity
pH 8 = weak base
pH 14 = strong base
pH 1 = weak acid
B)
D)
pH 14 = strong acid
pH 6 = strong acid
Which one will decrease the solubility of a gaseous solute in water?
A)
B)
C)
D)
15)
H2S
H2SO4
H2SO3
Please choose all that are matched correctly.
A)
C)
E)
14)
Phosphoric acid
Hydrophosphoric acid
Which one best describes a solution with a large mass of solvent and a small mass of solute?
A)
C)
13)
B)
D)
Which one is the formula for sulfurous acid?
A)
C)
E)
12)
Phosphorous acid
Hydrophosphorous acid
Increase the temperature and increase the pressure
Increase the temperature and decrease the pressure
Decrease the temperature and increase the pressure
Decrease the temperature and decrease the pressure
Which one will decrease the solubility of a solid solute in water?
A)
B)
C)
D)
Increase the temperature and increase the surface area
Increase the temperature and decrease the surface area
Decrease the temperature and increase the surface area
Decrease the temperature and decrease the surface area
16)
What is the empirical formula for C6H15 ?
17)
A compound has an empirical formula C2H5 and a molar mass of 116.28 g. What is the molecular
formula?
18)
Which atom would we predict to have the greatest electron affinity?
A)
B)
C)
D)
One with many protons and many electron clouds
One with few protons and many electron clouds
One with many protons and few electron clouds
One with few protons and few electron clouds
Please consider the Lewis dot diagram for SO32– for questions 19-21.
19)
Which one best describes the central atom in HCO– ?
A)
B)
C)
D)
20)
What is the electronic geometry for HCO– ?
A)
C)
E)
21)
B)
C)
D)
Trigonal planar
Trigonal pyramidal
Linear
B)
D)
Tetrahedral
Bent
The O atom has a smaller ionization energy because it has fewer protons and more electron
clouds.
The F atom has a greater ionization energy because it has more protons and the same
number of electron clouds.
The O atom has a larger radius because it has fewer protons and the same number of
electron clouds.
The F atom has a greater ionization energy because it has more protons and fewer electron
clouds.
K
B)
Cu
C)
Ca
D)
Kr
E)
Br
Which one has the largest radius?
A)
25)
Tetrahedral
Bent
Which one has the smallest atomic radius?
A)
24)
B)
D)
Please consider an atom of oxygen and an atom of fluorine. Please choose all correct statements.
A)
23)
Trigonal planar
Trigonal pyramidal
Linear
What is the molecular geometry for HCO– ?
A)
C)
E)
22)
2 bonding pairs of electrons and 0 lone pairs
3 bonding pairs of electrons and 1 lone pair
3 bonding pairs of electrons and 0 lone pairs
2 bonding pairs of electrons and 1 lone pair
Si4–
B)
Cl–
C)
K+
D)
Ar
E)
Sc3+
Please choose all molecules that would be polar covalent.
A)
B)
C)
D)
Trigonal planar electronic geometry and bent molecular geometry
Tetrahedral electronic geometry and trigonal pyramidal molecular geometry
Tetrahedral electronic geometry and tetrahedral molecular geometry
Tetrahedral electronic geometry and bent molecular geometry
26)
D
T (oC)
E
C
B
A
Heat (J)
Please choose all true statements.
A)
B)
C)
D)
E)
D represents heat of fusion and heat of vaporization.
B represents heat of solidification and heat of condensation.
C represents liquid H2O boiling.
E represents steam being heated.
A represents ice being melting.
27)
What is the ending electron configuration for As2– ?
28)
Please choose all that have identical atoms as the representative particle.
A)
C)
E)
29)
B)
D)
Helium
Sand (SiO2)
Please choose all true statements.
A)
B)
C)
D)
E)
30)
14 kt gold
24 kt gold
Air
The boiling point of water is 0oC.
Heat of condensation = +q.
Heat of fusion = –q.
Heat of solidification = –q.
The melting point of ice is 0oC.
Please use the attached solubility graph. When a saturated solution of NaNO3 in 100 g H2O is
heated from 10oC to 35oC, what additional mass of NaNO3 will dissolve in the solution to keep the
solution saturated?
Problems (40%)
Please show all your work for any credit!
1)
How many kpies are in 3.70 X 10–13 ppies?
2)
How many cJ are in 94.0 MJ?
3)
What is the % yield oxygen?
2 Al(ClO3)3 (s)  2 AlCl3 (s) + 9 O2 (g)
Mass of crucible
Mass of crucible + Al(ClO3)3
60.00 g
64.88 g
Mass of crucible after heating
62.63 g
4)
A compound contains 24.822 g carbon, 2.087 g hydrogen & 44.091 g oxygen. What is its
empirical formula?
5)
A 37.8-g sample of aluminum has an initial temperature of 8.0oC. It loses 653 J of heat. What is
the final temperature of the sample? The specific heat capacity of aluminum is 0.900 J/g oC.
Chemistry Test 4-2
Form__________
Multiple Choice (60%)
1)
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16)
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2)
_____
17)
_____
3)
_____
18)
_____
4)
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19)
_____
5)
_____
20)
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6)
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21)
_____
7)
_____
22)
_____
8)
_____
23)
_____
9)
_____
24)
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10)
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25)
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11)
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26)
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12)
_____
27)
_____
13)
_____
28)
_____
14)
_____
29)
_____
15)
_____
30)
_____
Name __________________________________
Problems (40%)
Please show all your work for any credit.
1)
____________________
2)
____________________
3)
____________________
4)
____________________
5)
____________________