Download b the mole concept

FINAL EXAM
CHEMISTRY 11
Name ____________________
June 2007
Multiple Choice
40 marks
Short Answer
30 marks
Total : 70 marks
Suggested time: 80 minutes
Useful constants: Avogadro’s = 6.02 x 1023
molar volume of a gas at STP = 22.4 L / mol
6.
Select the BEST response.
7.
A
B
C
D
3
4
5
6
2. What is the product of the following two
measured numbers: 2.1 x 3.62 ?
A
B
C
D
7.6
7.60
7.602
8
3. Find the difference between the following two
measured numbers: 13.37 - 12.6 ?
A
B
C
D
4.
0.7
0.77
0.770
0.8
Which Group 1 element has the highest
ionization energy?
proton and neutron
proton and electron
neutron and electron
none of these
The compound CsF is
A
B
C
D
1. A length measurement was recorded as 0.010100
cm. How many significant figures are in the number?
A
B
C
D
Which two particles are approximately equal in
mass?
ionic
diatomic
covalent
double
8. Isotopes of the same element always have the
same number of
A neutrons
B protons
C electrons and neutrons
D protons and neutrons
9.
What is the formula for ammonium phosphate?
A
B
C
D
NH4PO4
(NH4)3PO4
NH4(PO4)3
(PO4)3NH4
10. The name of NiO2 is
A
B
C
D
nickel oxide
nickel (II) oxide
nickel (IV) oxide
nickel dioxide
11. The name of CS2 is
A
B
C
D
5.
lithium
sodium
potassium
rubidium
A
B
C
D
carbon sulfide
carbon (II) sulfide
carbon (IV) sulfide
carbon disulfide
In forming ions, non-metals
12. The formula (NH4)2Cr2O7 represents
A
B
C
D
gain electrons
gain protons
lose electrons
lose protons
A
B
C
D
13 atoms
15 atoms
17 atoms
19 atoms
13. The molar mass of Co(CH3COO)2 is
A
B
C
D
117.9 g/mol
120.9 g/mol
146.0 g/mol
176.9 g/mol
20. Which set of coefficients correctly balances the
following reaction?
_____ S8 + _____ P4 -----> _____ P4S3
A
B
C
D
8, 3, 8
3, 8, 8
6, 8, 4
1, 1, 1
14. The number of moles in 4.20 g of baking soda,
NaHCO3, is
21. An equation for a double replacement reaction is
A
B
C
D
0.0269 mol
0.0500 mol
4.20 mol
352 mol
15. A container holds 2.41 x 1024 molecules of SO2.
The
number of moles of SO2 present is
A
B
C
D
0.400 mol
2.50 mol
4.00 mol
40.0 mol
16. The percentage by mass of Fe in FeCl2 is
A
B
C
D
33.3 %
44.0 %
55.8 %
60.8%
17. How many grams of CuCl2 must be dissolved in
water to make 3.00 L of 0.500 M CuCl2 solution?
A
B
C
D
0.0112 g
22.4 g
202 g
807 g
18. How many litres of 0.300 M AlF3 solution would be
needed to obtain 2.50 mol of AlF3?
A
B
C
D
0.120 L
0.750 L
2.80 L
8.33 L
19.What is the new concentration when 15.0 mL of a
3.00 M solution of MgBr2 is diluted to 100.0 mL?
A
B
C
D
A
B
C
D
Fe + CuSO4
2 K + 2 H 2O
H2SO4 + 2 NaOH
2 NH4Cl + Ca(OH)2
FeSO4 + Cu
2 KOH + H2
Na2SO4 + 2 H2O
2 NH4OH + CaCl2
22. A single replacement reaction that proceeds without
heating
A Fe + CuSO4
FeSO4 + Cu + energy
B 2 K + 2 H2O + energy
2 KOH + H2
C C3H8 + 5 O2
3 CO2 + 4 H2O + energy
D 2 NH4Cl + Ca(OH)2
2 NH4OH + CaCl2 +
energy
23. The reaction
MgCO3 + energy
A
B
C
D
MgO + CO2
is an
endothermic decomposition
exothermic decomposition
endothermic synthesis
exothermic synthesis
24. Which of the following equations represents
an acid-base neutralization?
A
B
C
D
Ba(OH)2 + H2SO4
Na2SO4 + BaCl2
CaO + CO2
Zn + 2 HCl
BaSO4 + 2 H2O
2 NaCl + BaSO4
CaCO3
ZnCl2 + H2
25. Given a closed system and a reaction involving no
gases, the masses of the reactants and the masses of the
products should be
A close to equal
B different
C identical
D similar
0.00200 M
0.450 M
20.0 M
5.00 x 102 M
2
26. The reaction of Ba(OH)2 and H2SO4 produces a
precipitate with the chemical formula
A
B
C
D
Ba(OH)2
BaSO4
H2SO4
H 2O
2 Al + 6 HCl(aq) -----> 2 AlCl3
0.60 mol
0.90 mol
1.4 mol
3.0 mol
Cu + 2 HCl
CuCl2
The reactant in excess is
+ H2
Cu
HCl
CuCl2
H2
29. The mass of K needed to produce 14 g of KOH
in the following reaction is
2 K + 2 H2O
A
B
C
D
0.69 g
1.4 g
9.8 g
20 g
2 mol
4 mol
6 mol
8 mol
31. The percent yield of water in a reaction in which the
theoretical yield was 45.4 g H2O and the
experimental
yield was 36.2 g H2O is
A
B
C
D
28. The following equation describes a reaction in
which 3.2 mol of copper are reacted with 6.6 mol
of HCl.
A
B
C
D
A
B
C
D
3 CO2(g) + 4 H2O(g) +
If 1.5 mol of oxygen are consumed in this
reaction,
the number of moles of CO2 produced is
A
B
C
D
+ 3 H2
One of the reactants is totally consumed. How
much of the other reactant remains unreacted?
27. Propane gas, C3H8, burns in oxygen to produce
carbon dioxide gas and water vapour. The equation
for the reaction is:
C3H8(g) + 5 O2(g)
energy
30. The following equation describes a reaction in
which 12 mol of aluminum and 30 mol of HCl(aq)
are combined:
2 KOH + H2
9.20 %
12.5 %
79.7 %
125 %
32. Consider the following reaction
2 KNO3
 2 KNO2 + O2
If 0.500 mol KNO3 were to react, the volume of
O2 produced would be
A 2.24 L
B 5.60 L
C 0.560 L
D 0.0446 L
33. Consider the following reaction
AgNO3(aq) + NaCl (aq)  AgCl(s) + NaNO3
(aq)
If 10.0 mL of 0.200M NaCl were to react, the mass of
AgCl produced would be
A
B
C
D
0.0287 g
0.287 g
2.87 g
287 g
3
34. The concentration of chloride ion in a 1.0 M
solution of PbCl4 is
A
B
C
D
39. Compounds that have a benzene ring in them are
called:
0.00 M
0.80 M
1.0 M
4.0 M
A
B
C
D
35. Which of the following would form a nonconducting solution?
A.
B.
C.
D.
MgBr2
KNO3
C12H12O6
(NH4)2S
A
B
C
D
Saturated organic compounds contain
only single bonds
at least one double bond
all double bonds
all the water they can hold
36.
esters
cycloalkane
aromatics
ketones
40. Which of the following compound names is
possible?
A.
B.
C.
D.
chloromethene
2-bromo-1-propyne
1,6-dibromo-3-pentyne
1,1,1-trichloro-2-butene
37. Which is the correct structural formula for
2 - bromo - 4 - methyl - 2 - pentene?
A
B
C
D
C
C
C
C
Br
C
C
38. Classify the hydrocarbon with the following
structural formula:
C-C-C-C=C-C
A
B
C
D
alkane
alkene
alkyne
none of the above
4
ANSWER ANY THREE SECTIONS.
(Show your work for calculations. )
2.
Consider a reaction in which X + 35 kJ  Y.
a)
A
INTRODUCTION TO CHEMISTRY
1.
Multiply and answer with the correct units and
significant
figures: 2.50 L x 4.000 mol/L. 2 marks
b) Label the activation energy. 1 mark
c)
D
Draw electron dot (Lewis) structures for HCl, and I2
2 marks
B
THE MOLE CONCEPT
1.
A container holds 4.3 moles of SO3 gas at standard
temperature and pressure. Calculate:
a)
the volume of the container
b) the mass of the SO3
c)
the number of molecules of SO3
45.0 mL of 0.200 M lead (II) nitrate are reacted with
3.81 g of sodium chloride. Calculate the mass of
lead(II) chloride that is formed. 10 marks
E
SOLUTIONS & ORGANIC CHEMISTRY
1.
A solution is made by mixing 4.0 L of 2.0 M MgCl2
with 6.0 L of 3.0 M AlCl3 There is no reaction. What
is the concentration of chloride in the solution after
mixing? 3 marks
2.
Draw the structural formula for each. It is necessary to
show hydrogens only when they are connected to
oxygens.
3 marks
d) the number of atoms of oxygen. 8 marks
2.
What mass of sodium chloride is dissolved in
50.0 mL of a 0.10 M solution of sodium chloride?
2 marks
STOICHIOMETRY
1.
4. How are the isotopes nitrogen-14 and nitrogen-15
similar and how are they different? 2 marks
5.
Label the enthalpy. 1 mark
d) State whether this reaction is exothermic or
endothermic. 1 mark
2. Name 4 chemical families in the periodic table. 2
marks
3. Name the family and list three properties or trends
involving the group containing chlorine. 2 marks
Sketch a graph of potential energy versus progress
of reaction. 1 mark
a) 2,3 – dimethy-lpentane
b) 1,3 – diethyl-cyclohexane
c) 2 - butanol
3.
Name each. 4 marks
a)
b)
Cl
C
CHEMICAL REACTIONS
1.
Write a balanced equation for each of the reactions
given below.
Use symbols to indicate the state (ie: solid, liquid, etc.)
of each substance. Use only whole numbers as
coefficients.
NO2
Cl
c)
C
d)
C
C
C
C
C
Cl
C C
C C
C C
Cl
a) “Solid aluminum metal reacts with aqueous
hydrogen chloride to produce aqueous
aluminum chloride and hydrogen gas.” 3 marks
b) “Aqueous calcium nitrate reacts with
solid sodium phosphate to produce solid
calcium phosphate and a second product.
The second product is aqueous.” 3 marks
ANSWER ON SEPARATE PAGE
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