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CHEMISTRY 111 Practice Exam 2

1. How many moles of H+(aq) ions are present in 1.25 L of 0.75 M nitric acid?  A.0.60 mol
B.0.75 mol
C.0.94 mol
D.1.7 mol
E.1.9 mol
 
2.Which of the following will be least soluble in water? 
A.potassium sulfate, K2SO4
B.ammonium nitrate, NH4NO3
C.chloromethane, CH3Cl
D.calcium chloride, CaCl2
E.ethanol, C2H6O
 
3.Select the precipitate that forms when the following reactants are mixed. Mg(CH3COO)2(aq) + LiOH(aq)  
A.LiCH3COO
B.Li(CH3COO)2
C.MgOH
D.Mg(OH)2
E.CH3OH
 
4.Select the precipitate that forms when aqueous lead(II) nitrate reacts with aqueous sodium sulfate.  A.NaNO3
B.Na2NO3
C.PbSO4
D.Pb2SO4
E.PbS
 
5.Consider the reaction:
3Co2+(aq) + 6NO3¯(aq) + 6Na+(aq) + 2PO43¯(aq)
Co3(PO4)2(s) + 6Na+(aq) + 6NO3¯(aq)
Identify the net ionic equation for this reaction. 
A.Na+(aq) + NO3¯(aq) NaNO3(aq)
B.3Co2+(aq) + NO3¯(aq) + Na+(aq) + 2PO43¯(aq) Co3(PO4)2(s) + NaNO3(aq) C.3Co2+(aq) + 6NO3¯(aq) + 6Na+(aq) + 2PO43¯(aq) Co3(PO4)2(s) + 6NaNO3(aq) D.3Co2+(aq) + 2PO43¯(aq) Co3(PO4)2(s)
E.None of these choices is correct. 
 
6.A base 
A.causes phenolphthalein indicator to change from colorless to pink. B.donates a proton in a proton transfer reaction.
C.accepts electrons in an electron transfer reaction.
D.produces hydrogen ions in solution.
E.does none of these choices.
 
7.Ammonia, NH3, produces hydroxide ions in aqueous solution by  A.donating a proton to an acid molecule.
B.donating a proton to a water molecule.
C.donating a hydrogen ion to a water molecule.
D.accepting an electron from an acid molecule.
E.accepting a proton from a water molecule.
 
8.Select the best statement relating to the following reaction: 2MnO2(s) + KClO3(aq) + 2KOH(aq) 2KMnO4(aq) + KCl(aq) + H2O(l)  A.Mn in MnO2 is oxidized.
B.O in KClO3 is the oxidizing agent.
C.K in KClO3 is the reducing agent.
D.H in KOH is oxidized.
E.Cl in KClO3 is the reducing agent.
 
9.In a redox reaction, electrons are transferred 
A.from the substance being oxidized to the reducing agent.
B.from the oxidizing agent to the reducing agent.
C.from the substance being reduced to the oxidizing agent.
D.from the substance being oxidized to the substance being reduced. E.from the substance being reduced to the substance being oxidized.  
10.Calculate the oxidation number of sulfur in sodium metabisulfite, Na2S2O5.  A.-2
B.+2
C.+4
D.+5
E.None of these choices is correct.
 
11.The oxidation numbers of P, S and Cl in H2PO2¯, H2S and KClO4 are, respectively  A.-1, -1, +3
B.+1, -2, +7
C.+1, +2, +7
D.-1, -2, +7
E.-1, -2, +3
 
12.Select the classification for the following reaction.
2Na(s) + 2H2O(l) 2NaOH(aq) + H2(g) 
A.precipitation
B.acid-base
C.redox
D.combination
E.None of these choices is correct.

13.A gas mixture consists of equal masses of methane (molecular weight 16.0) and argon (atomic weight 40.0). If the partial pressure of argon is 200. torr, what is the pressure of methane, in torr?  A.80.0 torr

B.200. torr
C.256 torr
D.500. torr
E.556 torr
 
14.A weather balloon was initially at a pressure of 0.950 atm, and its volume was 35.0 L. The pressure decreased to 0.750 atm, without loss of gas or change in temperature. What was the change in the volume?  A.increased by 44.3 L

B.increased by 9.3 L
C.increased by 7.4 L
D.decreased by 27.6 L
E.decreased by 7.4 L
 
15.A sample of nitrogen gas at 298 K and 745 torr has a volume of 37.42 L. What volume will it occupy if the pressure is increased to 894 torr at constant temperature?  A.22.3 L
B.31.2 L
C.44.9 L
D.112 L
E.380 L
 
16.A carbon dioxide sample weighing 44.0 g occupies 32.68 L at 65C and 645 torr. What is its volume at STP?  A.22.4 L
B.31.1 L
C.34.3 L
D.35.2 L
E.47.7 L

17.Calcium hydroxide, which reacts with carbon dioxide to form calcium carbonate, was used by the ancient Romans as mortar in...
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