R = 0.08206 L.atm/mol.K         R = 8.314 J/mol.K   
1 atm = 760 Torr            1 atm = 101325 Pa = 101.325 kPa
PV = nRT      Pi = XiP      Xi = ni/n         q = CΔT
M = m/n      d = m/V      M = dRT/P         q = mcΔT
urms = (3RT/M)1/2             teff(A)/teff(B) = (MA/MB)1/2   
ΔH° = Σ nΔHf°(products) - Σ nΔHf°(reactants)



1.
How many moles of Na+ ions are present in 360.7 mL of 0.588 M Na2CO3?
A.
0.329 mol Na+
B.
0.424 mol Na+
C.
0.538 mol Na+
D.
0.678 mol Na+
E.
0.903 mol Na+


2.
In the following reaction, what ions, if any, are spectator ions?
    MgCl2(aq)    +    NaOH(aq)    →    products
A.
magnesium and hydroxide ions
B.
sodium and chloride ions
C.
there are no spectator ions
D.
chloride and hydroxide ions
E.
magnesium and sodium ions


3.
Select the precipitate that forms when aqueous strontium chloride reacts with aqueous sodium sulfate.
A.
NaCl
B.
NaCl2
C.
SrSO4
D.
SrSO3
E.
No precipitate forms


4.
If 21.54 mL of 0.377 M barium hydroxide are needed to titrate 28.76 mL of nitric acid, what is the molarity of the acid?
     
A.
0.188 M
B.
1.129 M
C.
0.282 M
D.
0.847 M
E.
0.565 M


5.
What is the oxidation number of nitrogen in KNO2 ?
A.
-1
B.
+1
C.
+5
D.
+3
E.
+2


6.
Identify the oxidizing agent in the following redox reaction as it proceeds forward.
    2Ag+    +    Cd(s)    →    2Ag(s)    +    Cd2+
A.
Ag+
B.
Cd(s)
C.
Ag(s)
D.
Cd2+
E.
none of the above


7.
Which one of the following is not a redox reaction?
A.
B.
C.
D.
E.


8.
Select the classification for the following reaction.
   
A.
precipitation
B.
neutralization
C.
redox
D.
combination
E.
decomposition


9.
Select the classification for the following reaction.
   
A.
neutralization/combination
B.
precipitation/combination
C.
redox/decomposition
D.
redox/displacement
E.
redox/combination


10.
The air pressure in a decompression chamber is 1.031 atm. What is this pressure in torr?
A.
816.9 torr
B.
751.8 torr
C.
783.6 torr
D.
727.5 torr
E.
697.1 torr


11.
'The volume of an ideal gas is directly proportional to its absolute temperature at constant pressure and number of moles' is a statement of __________________ Law.
A.
Boyle's
B.
Charles's
C.
Avogadro's
D.
Dalton's
E.
Gay-Lussac's


12.
A sample of oxygen gas at 22.4°C and 64.3 atm occupies a volume of 18.2 L. What will the gas pressure be if the volume is changed to 41.7 L and the temperature is changed to 44.5°C?
A.
30.2 atm
B.
55.8 atm
C.
27.6 atm
D.
35.8 atm
E.
26.9 atm


13.
Assuming ideal behavior, what is the density of F2 gas at STP?
A.
2.458 g/L
B.
1.407 g/L
C.
0.991 g/L
D.
1.695 g/L
E.
3.885 g/L


14.
What is the pressure in a 4.11-L flask containing 3.62 g of NO2 at 15.6°C?
A.
0.415 atm
B.
0.390 atm
C.
0.454 atm
D.
0.498 atm
E.
0.528 atm


15.
A mixture of 7.48 g N2 (M = 28.02 g/mol) and 3.02 g NO2 (M = 46.01 g/mol) has a total pressure of 600. torr. What is the partial pressure of N2?
A.
446. torr
B.
482. torr
C.
426. torr
D.
388. torr
E.
377. torr


16.
What volume of CO2 gas is needed to react with 51.6 g of lithium oxide (M = 29.88 g/mol) at 24°C and 1.00 atm?
    Li2O    +    CO2    →    Li2CO3
A.
36.0 L
B.
34.0 L
C.
30.6 L
D.
42.1 L
E.
28.5 L


17.
Which of the following gases will be the slowest to diffuse through a room?
A.
SO2
B.
NO2
C.
F2
D.
CO2
E.
Cl2


18.
Select the gas with the highest root-mean-square molecular speed at 25°C.
A.
O2
B.
F2
C.
N2
D.
CO2
E.
All these gases have the same root-mean-square molecular speed at 25°C.


19.
A system releases 493. J of heat while performing 383. J of work on the surroundings. Calculate ΔE of the system.
A.
110. J
B.
–876. J
C.
876. J
D.
–110. J
E.
685. J


20.
Which of the following statements is true?
A.
In an exothermic reaction the value of the enthalpy change is negative.
B.
The standard state of a substance in aqueous solution is a concentration of 1 g/mL.
C.
Standard enthalpies of formation of compounds are always negative.
D.
The enthalpy change of a reaction does not depend on the path of the reaction but the energy change does.
E.
In general heat and work are state functions.


21.
A small object with mass 30.7 g is initially at 100.0°C. It is dropped into a coffee cup calorimeter containing 50.0 g of water at a temperature of 20.0°C. After stirring, the final temperature of both object and water is 29.3°C. Assuming no heat losses, use the specific heat capacities below to identify the material the object is made of.
H2O
4.184 J/g⋅K
 
C
0.711 J/g⋅K
Al
0.900 J/g⋅K
 
Cu
0.387 J/g⋅K
Fe
0.450 J/g⋅K
 
Au
0.129 J/g⋅K
 
A.
Fe
B.
Cu
C.
Al
D.
Au
E.
C


22.
The highly exothermic thermite reaction, in which aluminum reduces iron(III) oxide to elemental iron, has been used by railroad repair crews to weld rails together.
2Al(s)   +    Fe2O3(s)    →    2Fe(s)    +    Al2O3(s)           ΔH = -850. kJ
What mass of aluminum is needed to produce 686. kJ of heat ?
A.
39.5 g
B.
33.9 g
C.
43.5 g
D.
31.3 g
E.
53.7 g


23.
Use Hess's Law to calculate the enthalpy change for the reaction
 
from the following data:
 
A.
–339.2 kJ
B.
339.2 kJ
C.
–112.5 kJ
D.
112.5 kJ
E.
117.6 kJ


24.
Which one of the following is a correct formation reaction that properly defines a ΔH°f value?
A.
B.
C.
D.
E.


25.
Consider the reaction of the compound AB3(s) with oxygen gas:
     2 AB3(s)     +     5 O2(g)    →    2 AO2(g)     +     6 BO(g)
Calculate the standard enthalpy change for this reaction given the following data.
Compound
ΔH°f
 
Compound
ΔH°f
AB3(s)
–111.4 kJ/mol
 
AO2(g)
–25.7 kJ/mol
 
 
 
BO(g)
–60.4 kJ/mol
 
A.
–191.0 kJ
B.
191.0 kJ
C.
–636.6 kJ
D.
636.6 kJ
E.
533.8 kJ


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