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Player 1
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Player 3
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Player 2
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Player 4
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Define Fractional
Distillation
Show Answer
Answer for 5 Points
Collecting different
fractions of a mixture
based on boiling
points
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Separating insoluble solids
based on their densities is
called
________________.
Show Answer
Answer for 5 Points
Separation by Flotation
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Separating solids by filtration
requires the solids differ by
what characteristic property?
Show Answer
Answer for 5 Points
Solubility
Back to Board
Separating mixtures of soluble solids
by using differences in their
solubilities at different temperatures
is called ______________________.
Show Answer
Answer for 5 Points
Fractional Crystallization
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Technique for separating
dissolved chemical substances
by taking advantage of their
different rates of migration
across sheets of paper
Show Answer
Answer for 5 Points
Paper Chromatography
Back to Board
What characteristic property of two
liquids must differ if a mixture of
them is to separated by fractional
distillation?
Show Answer
Answer for 10 Points
Boiling Point
Back to Board
In the fractional distillation of liquids, which
fraction has the highest boiling point?
Which has the lowest boiling point?
Show Answer
Answer for 10 Points
Fraction IV will have the
highest boiling point, while
Fraction II will have the
lowest boiling point.
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Define a Mixture
Show Answer
Answer for 10 Points
A substance that contains two
or more pure substances
physically combined.
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Define a Pure Substance.
Show Answer
Answer for 10 Points
A single substance in
which it cannot be broken
down by physical means
and has its own
characteristic properties
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How can drinking water
be obtained from
seawater?
Show Answer
Answer for 10 Points
The seawater must be boiled
to dryness leaving the salt
behind, however something
must collect the evaporated
water so it can condense into
a separate container
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Based on the reading 5.2
Petroleum is gasoline a mixture
or a pure substance?
Show Answer
Answer for 15 Points
Gasoline is a mixture
containing Hexane, Heptane,
Octane, Nonane and
Decane
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Separating sand and sawdust
requires that the substances have
different densities. What needs to
be true about their solubilities for
this process to work?
Show Answer
Answer for 15 Points
Both substances have to be
insoluble in the solvent used.
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Suppose a mixture is separated and
found to contain iron filings, salt, and
sulfur. If the same amounts of these
three substances are mixed together
again, will the new mixture have the
same properties as the original
mixture?
Show Answer
Answer for 15 Points
The properties would only
matched the original
substance if they were
mixed in the same original
proportions.
Back to Board
Paper chromatography of a
purple felt pen gives the
results of the colors blue and
red. How would the
chromatography of just blue
or red look?
Show Answer
Answer for 15 Points
Since blue and red are primarily
colors they would not separate but
instead just travel up the paper to
the same spot as before.
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A sample of liquid was boiled for
12 minutes. During that time, the
boiling point remained constant
and the sample boiled down to half
of its original volume. Is the liquid
a pure substance?
Show Answer
Answer for 15 Points
Based on the data given you
cannot tell. It may still rise in
temperature and produce
another plateau before it bolis
to near dryness.
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Why can you not separate a mixture of
oxygen and nitrogen by fractional
distillation with the equipment used in this
course? (see the table below)
Gas
Melting
Point
Boiling
Point
Density
Solubility
Oxygen
-218
-183
1.43 x 10-3
3.6 x 10-3
Nitrogen
-210
-196
1.25 x 10-3
1.6 x 10-3
Show Answer
Answer for 20 Points
Their boiling points are too far below room
temperature
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Suppose you have pencil shavings, iron
shavings, and plastic beads all mixed together.
You put them into a container of water, stir the
mixture thoroughly, then pour off the water into
another container. Which substance did you
separate from the others? (Their densities are:
pencil shavings, 0.86 g/cm3; iron shavings,
7.87 g/cm3; plastic beads,0.91 g/cm3.)
Show Answer
Answer for 20 Points
Iron shavings
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The Table below shows whether the substances
listed dissolve in Isopropanol.
Solid
Sugar
Citric Acid
TOP
Sand
Baking Soda
Solubility in Isopropanol
Insoluble
Soluble
Soluble
Insoluble
Insoluble
Which pair of substances could you most
completely separate by stirring with
Isopropanol, filtering, and evaporating the
filtrate?
Show Answer
Answer for 20 Points
Citric Acid paired which either sugar,
sand, or baking soda
OR
TOP paired which either sugar, sand,
or baking soda
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During the Fractional Distillation Lab,
the liquid collected in interval III is
heated in a suitable distilling tube,
and a record is made of the
temperature of vapor escaping from
the liquid as a function of time.
Draw a graph which represents the
data taken?
Show Answer
Answer for 20 Points
100
80
60
40
20
0
0
2
4
6
8
10
12
The graph should appear similar to the original mixture graph.
Back to Board
100
80
60
40
20
0
0
2
4
6
8
10
12
In which interval or intervals would the
liquid collected be likely to have a
constant boiling point?
Show Answer
Answer for 20 Points
The plateaus shown in
intervals II and IV indicate a
constant boiling point
Back to Board
100
80
60
40
20
0
0
2
4
6
8
10
12
In which interval or intervals would the
liquid collected definitely Not be a Pure
Substance?
Show Answer
Answer for 25 Points
During Interval III
Back to Board
100
80
60
40
20
0
0
2
4
6
8
10
12
The density of the liquid collected during
interval II is 0.56 g/cm3; the liquid
collected during interval IV has a density
of 0.80 g/cm3. What is the density of the
substance collected during interval II, in
g/cm3?
Show Answer
Answer for 25 Points
Greater than 0.56g/cm3
but less than 0.80
3
g/cm
Back to Board
The diagram
represents a gas
thermometer. The
drop of liquid
indicates a
temperature of 0°C.
If the drop moves
so that its bottom is
at the arrow, what
temperature does
the thermometer
read, in °C?
100°C
Show Answer
Answer for 25 Points
-50°C
Back to Board
Which of the substances listed in the
table below are liquids at 50°C?
Substances
Freezing Point (°C)
Boiling point (°C)
Ethane
-183
-88
Pentane
-129
36
Hexane
-94
69
Decane
-30
174
Pentadecane
10
271
Show Answer
Answer for 25 Points
Hexane, decane, and
pentadecane only
For a substance to be a liquid at 50°C, its
freezing point must be below 50°C and its
boiling point must be above 50°C. From the
substances in the table only hexane, decane,
and pentadecane fulfill these conditions.
Back to Board
Suppose you wish to separate a
mixture of substance I and
substance II by stirring the
mixture with water, filtering, and
evaporating the filtrate. In what
property must substances I and II
differ?
Show Answer
Answer for 25 Points
Solubility
One of the substances must be
soluble in water, and the other
insoluble, or nearly so
Back to Board
Authored by
Jeff Ertzberger - 2004
University of North Carolina at Wilmington
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