Multiple Choice
Identify
the letter of the choice that best completes the statement or answers
the question.
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1. |
Which
of the following ions has the same number of electrons as an argon atom,
Ar?
a. |
S2+ |
c. |
K- |
b. |
Mg2+ |
d. |
P3- |
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2. |
Which
type of reaction does the following equation represent?
Zn(s) + H2SO4(aq) ® H2(g) + ZnSO4(aq)
a. |
synthesis |
c. |
single
displacement |
b. |
decomposition |
d. |
double displacement |
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3. |
Which
of the following bonds is the most polar?
a. |
HF |
c. |
HCl |
b. |
FF |
d. |
ClCl |
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4. |
Who
stated that electrons can only jump between fixed energy levels?
a. |
Bohr |
c. |
Rutherford |
b. |
Chadwick |
d. |
Dalton |
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5. |
Which
of the following properties is typical of an ionic compound?
a. |
It
is colourless. |
c. |
It
is a nonelectrolyte. |
b. |
It is insoluble in water. |
d. |
It has a high melting point. |
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6. |
The
methane molecule, CH4(g), consists of a carbon atom bonded
to four hydrogen atoms. Its shape is
a. |
linear |
c. |
pyramidal |
b. |
bent |
d. |
tetrahedral |
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7. |
An
atom can form a positive ion by
a. |
losing electrons |
c. |
losing protons |
b. |
gaining
electrons |
d. |
gaining
protons |
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8. |
Which
of the following statements is not considered to be an observation?
a. |
The
colour of the cabinet is black. |
b. |
The height of the desk is 96 cm. |
c. |
The
temperature of the solution is 26°C. |
d. |
The temperature of a substance is a measure
of the average kinetic energy of the molecules that comprise it. |
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9. |
Which
of the following forms of electromagnetic energy has a higher frequency
than UV energy?
a. |
X-ray
waves |
c. |
microwaves |
b. |
radio waves |
d. |
infrared waves |
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10. |
Which
of the following atoms is subjected to magnetic fields and radio waves
during an MRI?
a. |
carbon |
c. |
hydrogen |
b. |
oxygen |
d. |
potassium |
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11. |
An
electron in an excited state must have
a. |
released energy in the form of light |
b. |
absorbed
energy |
c. |
paired with another electron from another
atom |
d. |
been
ejected from an atom by absorbing light energy |
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12. |
Which
of the following is an example of qualitative analysis?
a. |
determining
if a block of concrete has been carbonated |
b. |
identifying a substance by the colour it
emits during a flame test |
c. |
identifying
a substance by its line spectra |
d. |
all of the above |
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13. |
If
aqueous silver nitrate, AgNO3(aq), is mixed with aqueous
calcium chloride, CaCl2(aq),
a. |
no precipitate will form |
b. |
a
precipitate of calcium nitrate, Ca(NO3)2(s),
will form |
c. |
a
precipitate of silver chloride, AgCl(s), will form |
d. |
a
single displacement reaction will occur |
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Short Answer
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14. |
Briefly outline J.J. Thomsons contribution to modern atomic
theory.
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15. |
Complete each of the following double displacement reaction equations
by balancing it and adding states. Write the total ionic equation and
net ionic equation for each reaction.
a. AgNO3 + NaCl ® AgCl + NaNO3
b.
Na2CO3 + Zn(NO3)2 ®
NaNO3 + ZnCO3
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16. |
Draw
a Lewis structure for each of the following molecules:
a.
SiI4
b. NH3
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17. |
The
following flow chart outlines an experimental procedure for determining
the presence of Pb and/or Sr
ions in a solution.
a. Sodium chloride is added to the solution, and
a precipitate forms. The precipitate indicates the presence of which
ion?
b.
What piece of equipment could be used to separate the precipitate from
the supernate?
c.
Using the solubility rules, explain why sodium chloride must be added to the solution before
sodium sulfate in order to obtain conclusive results.
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18. |
Give
three situations in which spectroscopy can be used to perform qualitative
analysis.
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19. |
A
solution is known to contain sulfate and/or bromide ions. Design an
experiment to test for the presence of these two ions. Use the solubility
rules to help you decide which ions you should use to test for the presence
of sulfate and bromide ions.
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20. |
A
solution conducts electricity, is basic, and forms a precipitate when
sodium sulfate is added. When the solution is subjected to a flame test,
the flame turns a yellow-green colour. Write the chemical formula for
a solute that may be present in the solution. Give reasons for your
choice.
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21. |
During an experiment, a technician notes the colour of each solution
and conducts a flame test on each solution. Which ions are present in
solutions A to E in Table 1?
Table 1 Solution and Flame Colours
Solution |
Solution colour |
Flame
colour |
A |
colourless |
violet |
B |
blue |
green |
C |
colourless |
yellow |
D |
colourless |
yellow-red |
E |
colourless |
bright
red |
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A.
B.
C.
D.
E.
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22. |
Using
what you have learned in this unit, write a paragraph that explains
the chemistry behind a fireworks display. In your paragraph, include
the following terms: ground state, excited state, Bohr model of the
atom, flame test. Make sure that you comment, in general, on how the
different colours in a fireworks display are produced.
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