Chem 11
Practice Exam
Fall, 2006
Choose the best answer for each of the following questions. Fill in the corresponding oval
on the scantron sheet. Be sure to indicate the proper test form on the scantron sheet.
Remember to use the correct significant digits.
1. An oxygen sample has a volume of 4.50 L at 27OC and 800.0 tom. How many oxygen molecules does it
contain?
[A] 1 . 1 6 ~ 1 0 ~ [B]
~ 5 . 8 ~ 1 0 ~[C]
~ 2 . 3 2 ~ 1 0 ~ [Dl
~ 1 . 1 6 ~ 1 0 ~ [El
~ noneofthese
2. The net ionic reaction for the reaction between aqueous lead nitrate and aqueous potassium iodide is
[A] pb2+(ad + NO3-(ad +
ad + I-(ad + pb2+(aq) + I-(ad
+ K+(aq) + NO3-(ad
[B] pb2+(ad + ZI-(ad + Pb12(s)
[Dl Pb(N03)2(aql + KI(ad + Pb12(s) + KN03(ad
[El
none of these
3. When table sugar is burned in air, carbon dioxide and water vapor are products as shown by the following
unbalanced chemical equation
+ 02(& + C02(g) + H20(&
C12H2201
How many moles of oxygen are required to react completely with 1.0 mol of sugar?
PI
[A] 12
35
[c] 17.5
[Dl 24
[El
none of these
4. You are playing with a helium balloon on a typically warm California day. Suddenly, the Celsius temperature
doubles. Which of the following is true?
[A] The volume of the balloon will decrease.
[B] The actual temperatures are needed to answer this question.
[C] The volume of the balloon will double.
[El
[Dl The volume of the balloon will slightly increase.
The pressure inside the balloon will double.
5. When the following equations are balanced using the smallest possible integers, what is the number in front of
the underlined substance in each case?
Sr(s) P, (s) Sr, P, (s)
+
[A1 3
+
[Bl 18
Which of the following should have the lowest boiling point?
LA]
C5H12
PI
C2H(j
LC]
C3H8
[Dl
LEI
C4H10
CH4
A sample of helium gas occupies 12.4 L at 23OC and 0.956 atrn. What volume will it occupy at 40°C and 0.956
atm?
[A] 7.13 L
[B] 21.6 L
[C] 11.7L
[Dl 13.1 L
[El none of these
If temperature and pressure are held constant, the volume and number of moles of a gas are
[C] not enough information given
[A] directly proportional
[B] equal
[Dl inversely proportional
[El independent of each other
The intermolecular forces called hydrogen bonding will not exist between molecules of
[A] HF
[Bl NH3
The reaction AgN03(ad + NaCl(ad
[cl H z 0
+ AgCl(s)
[Dl H2
+ NaN03(ad is a(n)
[A] single-replacement
[B] oxidation-reduction
[Dl precipitation
[El none of these
[El any of these
reaction.
[C] acid-base
What is the formula for manganese(1V) oxide?
[A1 Mn2O
[Bl Mn40
[CI Mg20
[Dl Mn02
[El Mg02
Refer to the following unbalanced equation:
C6H14 + 0 2 + CO2 + H 2 0
What mass of oxygen (02) is required to react completely with 25.0 g of C6H14?
[A] 88.2 g
[B] 16.0 g
[C] 9.28 g
[Dl 608 g
[El 32.0 g
You transfer a sample of a gas at 17OC fi-om a volume of 5.67 L and 1.I0 atrn to a container at 37OC that has a
pressure of 1.10 atrn. What is the new volume of the gas?
[A] 5.90 L
[B] 12.34L
[C] 2.61 L
[Dl 5.30 L
[El none of these
If 18.0 g of C02 is produced in the reaction of C2H2 with 0 2 to form C02 and H20, how many grams of
H20 are produced in this reaction?
[A] 9.0 g
[B] 3.68 g
[C] 7.37 g
[Dl 14.7 g
[El none of these
15. What would happen to the average kinetic energy of the molecules of a gas sample if the temperature of the
sample increased fiom 20°C to 40°C?
[B] 1t would increase.
[A] It would double.
[Dl
[C] It would decrease.
[El Two of these
It would become half its value.
16. The binary compound PC13 is called
[A] triphosphorus chloride
[B] monophosphorus trichloride
[C] phosphorus chloride
[Dl phosphorus trichloride
[El none of these
17. A 3.0-mol sample of KC1O3 was decomposed according to the equation
2KC103(s) -t 2KCl(s) + 3o2(g)
How many moles of O2 are formed assuming 100% yield?
[A] 4.5 mol
[B] 2.5 mol
[C] 2.0 mol
[Dl
4.0 mol
[El 3.0 mol
18. The process of sublimation happens when which of the following occurs?
[A] A gas becomes a liquid.
[B] A liquid becomes a solid.
[Dl A solid becomes a liquid.
[El A liquid becomes a gas.
[C] A solid becomes a gas.
19. The bonds between hydrogen and oxygen in a water molecule can be characterized as
[A] dispersion forces
[B] London forces
[Dl
[El intermolecular forces
intramolecular forces
[C] hydrogen bonds
20. One mole of C 0 2 at STP will occupy
[A] 22.4 L
[B] 24.5 L
[C] 44 L
[Dl 1.0 L
[El 44 g
Reference: [lo.161
[I21 [A1
Reference: [ 13.241
Reference: [ 10.3 1]
Reference: [13.61]
[I51 [Bl
Reference: [5.17]
[I61 [Dl
Reference: [10.5]
[I71 [A1
Reference: [14.29]
[I81 [CI
Reference: [ 14.71
[I91 [Dl
Reference: [13.3 1]
Reference: [ 13.501
[ l l [A1
Reference: [8.15]
[21 [Bl
Reference: [7.39]
PI
[A1
Reference: [ 13.1 61
[41 [Dl
Reference: [7.25]
PI
[El
Reference: [ 14.21]
Reference : [ 13.251
Reference: [ 13.281
Reference: [14.28]
Reference : [8.351
[lo1 [Dl
Reference: [6.7]
[ I l l [Dl