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ChemPracticeFinalWeb


Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 
Convert 475 nanometers to cm.
a.
.475 cm
c.
4.75 x 10-5 cm
b.
475 cm
d.
4.75 x 109 cm
 

 2. 
What is the approximate diameter of a metal atom (Fe for example)
a.
2.8 cm
c.
2.8 Å  (angstroms)
b.
2.8 nm
d.
280 nm
 

 3. 
Which of the following elements is a nonmetal?
a.
Li
c.
Ti
b.
Sr
d.
N
 

 4. 
3416S2- has ____ protons, _______neutrons_________ electrons
a.
34, 16, 2
c.
16, 18, 18
b.
16, 34, 18
d.
16, 16, 16
 

 5. 
The name of the compound Fe2S3 is
a.
diferrum trisulfur
c.
triiron sulfate
b.
iron(II) sulfur(III)
d.
iron (III) sulfide
 

 6. 
The chemical formula for potassium sulfate  is
a.
P2S
c.
KSO3
b.
K2S
d.
K2SO4
 

 7. 
An experiment calls for 20.0 g of n-propyl alcohol , a substance whose density is 0.8 g/mL. What volume of n-propyl alcohol should be used?
a.
20.0 mL
c.
16 mL
b.
25.0 mL
d.
16 g
 

 8. 
What is the mass, in grams, of 0.100 mol Ba(NO3)2
a.
0.100 g
c.
261.3 g
b.
26.13 g
d.
2.61 g
 

 9. 
The number of oxygen atoms in 0.34g of H2O2 is ________ atoms.
a.
1.2 x 1022
c.
1.2 x 1023
b.
6.02 x1023
d.
3400
 

 10. 
When the following is balanced, what is the coefficient in front of the oxygen?
                  ___C5H10 +___ O2 -->____ CO2 +____ H2O
a.
5
c.
15
b.
10
d.
29
 

 11. 
What is the weight percent nitrogen in ammonium nitrate (NH4NO3)
a.
25 %
c.
82%
b.
17 %
d.
35 %
 

 12. 
A 100.0 g sample returned the following analyses: 40.2 % K, 26.9% Cr and 32.9% O. What is the simplest empirical formula of this compound?
a.
KCrO
c.
K2CrO4
b.
Cr3OK
d.
K2Cr2O7
 

 13. 
A double displacement reaction between Pb(NO3)2 and CaCl2 will produce what products:
a.
PbO2 and CaClO2 and N2
c.
CaPb and 2Cl2NO3
b.
PbO and CaCl2 and NO5
d.
PbCl2 and Ca(NO3)2
 

 14. 
     
In a single displacement reaction Ag + HCl --> AgCl + H+ in an aqueous environment How many grams of HCl would be required to just react with 10.7 grams of Ag.
a.
10.7 grams HCl
c.
3.62 g HCl
b.
12.0 M HCl
d.
0.1 mole HCl
 

 15. 
     
Given the following :  3NO2(g) + H2O(l) ---> 2HNO3(aq) + NO(g).
What is the  number of moles of HNO3 that can form when 3.0 mol NO2 and 3.0 mol H2O react?
a.
6
c.
3
b.
2
d.
4
 

 16. 
A chemical reaction that releases heat energy to the environment is __________ with a ____________ enthalpy of reaction
a.
exothermic, negative
c.
exothermic, positive
b.
endothermic, negative
d.
endothermic, negative
 

 17. 
Which of the following would not conduct electricity
a.
molten NaCl
c.
aqueous CuSO4
b.
hexane
d.
3.0 M HCl
 

 18. 
Which of the following will depress the freezing point  of water.
a.
heating the water first.
c.
raising the pressure 10 Torr.
b.
adding an ionic substance.
d.
lowering the pressure 10 Torr.
 

 19. 
Which is the lowest energy electron orbital?
a.
1s
c.
3d
b.
2s
d.
1p
 

 20. 
     
What is the correct electron configuration for gallium (Ga)?
a.
[Kr] 3p3
c.
1s2,2s2,3s2,4s2,4d10, 4p1
b.
[Ar]4s2,3d10, 4p1
d.
[Ga] 4p1
 

 21. 
If a sample of H2 occupies 3.00 L at 640 Torr and 24 C, what volume would it occupy at STP?
a.
2.00 L
c.
1.92 L
b.
3.5 L
d.
2.32 L
 

 22. 
     
How many unpaired electrons are present in O2-
a.
0
c.
6
b.
2
d.
8
 

 23. 
How many moles of H2S gas would be present in a cylinder with a volume of 2.00 L at a pressure of 2.00 atmospheres at 200 K  R= 0.0821 L atm / mol K
a.
0.24 mol
c.
0.273 mol
b.
2.00 mol
d.
1.6 x 10 -3 mol
 

 24. 
Which of the following atoms has the largest radius?
a.
Fe
c.
Fe 3+
b.
Fe 2+
d.
None of the choices. All are same.
 

 25. 
Which of the following has the greatest electronegativity?
a.
F
c.
P
b.
O
d.
Br
 

 26. 
Which of the following would have the largest radius ?
a.
Be
c.
C
b.
N
d.
F
 

 27. 
Electronegativity for elements on the periodic table (excluding the Noble Gases)  increases ________ and ___________.
a.
down and right
c.
up and right
b.
down and left
d.
up and left
 

 28. 
The chemical bonding between Mg  and O in MgO is best described as _________ (based on differences in electronegativity).
a.
complex coordinate
c.
covalent
b.
ionic
d.
polar covalent
 

 29. 
According to VSEPR theory the expected molecular geometry of PH3 is
a.
linear
c.
trigonal pyramidal
b.
trigonal planar
d.
tetrahedral
 

 30. 
The Lewis dot structure for carbon monoxide is best characterized by
a.
not obeying octet rule
c.
a triple bond
b.
2 double bonds
d.
single bonds only
 

 31. 
How many sigma bonds and pi bonds are present in the following structure ?
mc031-1.jpg
a.
3 sigma, 2 pi
c.
4 sigma
b.
3 pi, 2 sigma
d.
2 sigma, 2 pi
 

 32. 
Which of the following has a bent structure with approximately a 109 degree bond angle
a.
SO4 -2
c.
CO
b.
H20
d.
CO2
 

 33. 
How many grams of KNO3 must be added to make 250 mL of solution at 0.2 M
a.
250 g
c.
5.05 g
b.
101. g
d.
0.2 g
 

 34. 
How many mL of 0.1 M KOH would be need to exactly neutralize 10 mL of 0.1 M H3PO4
a.
10 mL
c.
30 mL
b.
100 mL
d.
1 mL
 

 35. 
At some temperature the Keq for the decomposition of  N2O4(g) --> 2 NO2(g)  is  2.50 x 10-3 If the equilibrium concentration of N2O4 is 0.100 M what is the concentration of NO2?
a.
0.100 M
c.
0.0 M
b.
0.016 M
d.
2.5 x10-4 M
 

 36. 
Which of the following is the weakest acid?
a.
ascorbic acid, HC6H7O6 (Ka = 8.0 x 10-5)
c.
acetic acid, HC2H3O2 (Ka = 1.8 x 10-5)
b.
nitrous acid HNO2 (Ka = 7.1 x 10-4)
d.
hypobromous acid HBrO (Ka = 2.05 x 10-9)
 

 37. 
If the  pH of a 0.01M solution of acid is 2.0 the Ka must be
a.
a strong acid
c.
a weak acid
b.
a strong base
d.
a weak base
 

 38. 
A 1.0 M solution of KOH would have a pH of
a.
1
c.
0
b.
13
d.
14
 

 39. 
Which of the following represents a conjugate acid-base pair?
a.
HCl, NaOH
c.
H2SO4, SO4-2
b.
HNO3, NO3-
d.
NH4Cl, NH4+
 

 40. 
Which of follow corresponds to the formula for propane
a.
C3H3
c.
C2H5OH
b.
C3H8
d.
C3H6
 

 41. 
Which of the following would have the highest boiling point ?
a.
HF
c.
HBr
b.
HI
d.
HCl
 



 
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