Chem 101 Exam 2 Practice Exam Fall 2012
1. True or false? Ionic bonding occurs when a metal reacts with a nonmetal.
A) True
B) False
2. What is the shorthand electron configuration for Fluorine?
A) [Ne]3s2
B) [He] 2s22p5
C) [Ar]
D) [Ne]3s23p4
E) 1s21p62s22p6
3. Which of the following bonds does not have a dipole moment?
A) N-H
B) O-H
C) F-H
D) H-H
E) S-H
4. What is the electron configuration for the sulfide ion?
A) 1s22s22p63s23p4
B) 1s22s22p63s23p64s1
C) 1s22s22p63s23p6
D) 1s22s22p63s23p64s2
5. The electron configuration for the bromide ion is isoelectronic with (identical to) that of
A) Br
B) Kr
C) K
D) IE) none of these
6. What is the molar mass of CaCl2?
A) 75.53 g/mol
B) 64.10 g/mol
C) 82.91 g/mol
D) 110.98 g/mol
E) 221.96 g/mol
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7. True or false? The formula of a compound that expresses the smallest whole-number
ratio of the atoms present is called the empirical formula.
A) True
B) False
8. Choose the pair of compounds with the same empirical formula.
A) C2H2 and C6H6
B) NaHCO3 and Na2CO3
C) K2CrO4 and K2Cr2O7
D) H2O and H2O2
9. What is the balanced equation showing the reaction between calcium metal and water to
form aqueous calcium hydroxide and hydrogen gas.
A) Ca(s) +H2O(l) Ca(OH)2(aq) +H2(g)
B) Ca(s) +2H2O(l) Ca(OH)2(aq) +2H2(g)
C) 2Ca(s) +H2O(l) 2Ca(OH)2(aq) +H2(g)
D) Ca(s) +2H2O(l) Ca(OH)2(aq) +H2(g)
10. You have 1.0 mole of each compound below. Which has the greatest mass?
A) sodium hydroxide
B) iron(III) sulfate
C) lead(IV) oxide
11. The mass percent of chlorine in CaCl2 is
A) 63.9 %
B) 46.9 %
C) 31.9 %
D) 93.9 %
E) Cannot be determined from the information given
12. A sample containing 16.07 mol of magnesium has a mass of _________ g.
A) 6.610 10–1
B) 1.513 100
C) 40.38
D) 390.6
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Use the following to answer question 13:
When the following equations are balanced using the smallest possible integers, what is the
number in front of the underlined substance in each case?
13. Sb(s) + O2(g)
A) 1
B) 2
C) 4
D) 6
E) 12
14.
Sb2O5(s)
What is the correct electron configuration for the chlorine atom?
A) 1s22s22p63s23p24s23d1
B) 1s22s22p63s23p64s1
C) 1s22s22p62d7
D) 1s22s22p63s23p5
15. What is the electron configuration for the magnesium ion?
A) 1s22s2
B) 1s22s22p6
C) 1s22s23s2
D) 1s22s22p63s2
16.
Calculate the molar mass of Ba(NO3)2
17. When the following equation is balanced using the smallest possible integers, what is
the number in front of the substance in bold type?
Pb(NO3)2 + K2CO3
A) 5
B) 4
C) 3
D) 2
E) 1
PbCO3 + KNO3
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18. Which of the following has only nonpolar covalent bonds?
A) N2
B) CO
C) HI
D) CCl4
E) NaCl
19. The empirical formula of a compound is CH2O, and its molar mass is 90 g/mole.
Calculate its molecular formula.
A) CH2O
B) C2H4O2
C) C3H6O3
D) C4H8O4
E) none of these
20. True or false? SO2 has covalent bonds.
A) True
B) False
21. When the following equation is balanced using the smallest possible integers, what is
the number in front of the substance in bold type?
C2H6 + O2
A) 1
B) 2
C) 4
D) 6
E) 7
CO2 + H2O
22. Draw the Lewis structure of carbon dioxide
23. 50.1 g of Ni represents how many atoms?
A) 0.854 atoms
B) 3.02 1025 atoms
C) 8.32 10–23 atoms
D) 4.88 10–21 atoms
E) 5.14 1023 atoms
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24. A compound contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen (by mass).
Calculate the empirical formula.
A) CH2O
B) C2H2O
C) CH4O
D) C3H6O3
E) C2HO2
What element has the electron configuration 1s22s22p63s23p6?
A) Ar
B) Cl
C) Kr
D) S
E) Ne
25.
26. Which of the following has a triple bond? Hint: Draw the Lewis structure
A) H2O
B) C2H2
C) C2H4
D) CH4
27. What are the equivalencies for Gold?
A) 1 mole of Au = 6.02 x 1023 atoms of Au = 196.97g of Au
B) 1 mole of Au = 6.02 x 1023 molecules of Au2 = 393.94g of Au
C) 1 mole of Au = 6.02 x 1023 molecules of Au = 196.97g of Au
D) 1 mole of Au = 6.02 x 1023 atoms of Au = 6.02 x 1023 g of Au
28.
What is the element represented by 1s22s1
A) hydrogen
B) helium
C) lithium
D) neon
E) nitrogen
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29. When the following equation is balanced using the smallest possible integers, what is
the number in front of the substance in bold type?
PCl5 + H2O
A) 1
B) 2
C) 3
D) 4
E) 5
H3PO4 + HCl
30. Which ion is isoelectronic with Argon?
A) ClB) S2C) Ca2+
D) K+
E) All of the above ions are isoelectronic with argon
31. What is the element represented by 1s22s22p63s1
A) hydrogen
B) helium
C) lithium
D) neon
E) sodium
32. What are the equivalencies for Water?
A) 1 mole of H2O = 6.02 x 1023 atoms of H2O = 18.015g of H2O
B) 1 mole of H2O = 6.02 x 1023 molecules of H2O = 18.015g of H2O
C) 1 mole of H2O = 18.06 x 1023 molecules of H2O = 18.015g of H2O
D) 1 mole of H2O = 6.02 x 1023 molecules of H2O = 1.008g of H2O
33. True or false? SO2 has covalent bonds.
A) True
B) False
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Answer Key
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A
B
D
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B
D
A
A
D
B
A
D
C
D
D
261.34g
D
A
C
A
E
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E
A
A
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A
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E
E
E
B
A
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