### Unit 6 Review - Brooklyn College Academy

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States of Matter & Behavior of Gases
1.
What Kelvin temperature is equal to 25°C?
a)
b)
c)
d)
248 K
298 K
100 K
200 K
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2.
When the external pressure is 101.3 kPa torr,
water will boil at what temperature?
a)
b)
c)
d)
12.8°C
14.5°C
100°C
18°C
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3.
As ice cools from 273 K to 263 K, the average
kinetic energy of its molecules will
a)
b)
c)
d)
decrease
increase
remain the same
convert to potential energy
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4.
The phase change represented by the
equation I2 (s)  I2 (g) is called
a)
b)
c)
d)
sublimation
condensation
melting
boiling
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5.
As the pressure of a gas at 2 atm is changed
to 1 atm at constant temperature, the
volume of the gas
a)
b)
c)
d)
decreases
increases
remains the same
is undeterminable
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6.
Under the same conditions of temperature
and pressure, a liquid differs from a gas
because the particles of the liquid
a)
b)
c)
d)
are in constant straight-line motion
take the shape of the container they occupy
have no regular arrangement
have stronger forces of attraction between
them
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7.
A student investigated the physical and chemical
properties of a sample of unknown gas and then
investigated the gas. Which statement represents
a conclusion rather than an experimental
observation?
a)
b)
c)
d)
The gas is colorless.
The gas is carbon dioxide.
When the gas is bubbled in limewater, the liquid
becomes cloudy.
When placed in the gas, a flaming splint stops
burning.
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8.
Which set of values represents STP?
a)
b)
c)
d)
1 atm and 101.3 K
1 kPa and 273 K
101.3 kPa and 0°C
101.3 atm and 273°C
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9.
A gas changes directly to a solid during
a)
b)
c)
d)
fusion
saponification
deposition
decomposition
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10.The phase of a sample of a molecular
substance at STP is not determined by its
a)
b)
c)
d)
arrangement of molecules
intermolecular forces
number of molecules
molecular structure
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11.A 220.0-mL sample of helium gas is in a
cylinder with a movable piston at 105 kPa
and 275 K. The piston is pushed in until the
sample has a volume of 95.0 mL. The new
temperature of the gas is 310. K. What is the
new pressure of the sample?
a)
b)
c)
d)
51.1 kPa
243 kPa
216 kPa
274 kPa
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12.Which particle diagram
represents the arrangement
of F2 molecules in a sample
of fluorine at 95 K and
standard pressure?
a)
b)
c)
d)
1
2
3
4
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13. Given the cooling curve of a substance:
During which intervals is potential energy decreasing and average
kinetic energy remaining constant?
a)
b)
c)
d)
AB and BC
DE and BC
AB and CD
DE and EF
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14.What is the boiling point of propanone if the
pressure on its surface is 48 kilopascals?
a)
b)
c)
d)
25°C
30°C
35°C
40°C
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15.Using your knowledge of chemistry and the information in
Reference Table H, which statement concerning propanone
and water at 50°C is true?
a)
Propanone has a higher vapor pressure and stronger
intermolecular forces than water.
b)
Propanone has a higher vapor pressure and weaker
intermolecular forces than water.
c)
Propanone has a lower vapor pressure and stronger
intermolecular forces than water.
d)
Propanone has a lower vapor pressure and weaker
intermolecular forces than water.
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16.Two gas tanks contain nitrogen, N2(g), and
oxygen, O2(g). The volume of both tanks is 20 L,
the pressure in each tank is 2.0 atm, and the
temperature of each tank is 330 K. What can be
said of the number of molecules in each tank?
a)
There are more N2(g) molecules than O2(g)
molecules.
b)
There are more O2(g) molecules than N2(g)
molecules.
c)
They both have the same number of gas
molecules.
d)
Cannot be determined.
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