Two basic properties of the gas
phase are
A.) a definite shape and a definite volume
SOLID
B.) a definite shape but no definite volume
C.) no definite shape but a definite volume LIQUID
D.) no definite shape and no definite volume
Which substance has vibrating
particles in regular, fixed positions?
A.) Ca(s)
B.) Hg(l)
C.) Cl2(g)
D.) CaCl2(aq)
The circle on the left shows a magnified view of a very
small portion of liquid water in a closed container.
What would the magnified view show after
the water evaporates?
Boiling water is a physical change
A,B, and D - Water molecules are not decomposed into
hydrogen and oxygen gas (hydrogen is flammable and oxygen
supports combustion, if these gases were created there would
be explosions every time you boiled water)
C – the particles do not vanish (Law of Conservation of Matter)
E – when water molecules boil, they remain water,
the particle simply move farther away from one
another
Which grouping of the three phases of
bromine is listed in order from left to
right for increasing distance between
bromine molecules?
A.) gas, liquid, solid
B.) liquid, solid, gas
C.) solid, gas, liquid
D.) solid, liquid, gas
Which phase change is an
exothermic process?
A.) CO2(s)  CO2(g)
B.) NH3(g)  NH3(l)
C.) Cu(s)  Cu(l)
D.) Hg(l)  Hg(g)
Which change is exothermic?
A.) freezing of water
B.) melting of iron
C.) vaporization of ethanol
D.) sublimation of iodine
A 1.0-gram sample of solid iodine is placed in a
tube and the tube is sealed after all of the air is
removed. The tube and the solid iodine together
weigh 27.0 grams.
The tube is then heated until all of the iodine
sublimes and the tube is filled with iodine gas.
Will the weight after heating be:
A.) less than 26.0 grams.
B.) 26.0 grams.
Particle mass does
C.) 27.0 grams.
not depend on phase
D.) 28.0 grams.
E.) more than 28.0 grams.
Assume a beaker of pure water has
been boiling for 30 minutes. What is in
the bubbles in the boiling water?
A.) Air
B.) Oxygen gas and hydrogen gas
C.) Oxygen
D.) Water vapor
E.) Heat
A glass of cold milk sometimes forms a
coat of water on the outside of the glass
(Often referred to as 'sweat'). How does
most of the water get there?
A.) Water evaporates from the milk and condenses on
the outside of the glass.
B.) The glass acts like a semi-permeable membrane and
allows the water to pass, but not the milk.
C.) Water vapor condenses from the air.
D.) The coldness causes oxygen and hydrogen from
the air combine on the glass forming water.
You take a swim in the swimming pool.
Although it is a hot day when you come out,
you feel cold. Which of the following
statements is TRUE?
A.) The water in the pool is warmer than the air
B.) The water in the pool is colder than the air
C.) The water on your skin gets cold when you
step out of the pool
D.) The water on your skin evaporates
L  G is endothermic, absorbing heat energy from your body
At which temperature will equilibrium exist
for the system below?
H2O(s) ↔ H2O(l)
A.) 0 K
B.) 100 K
C.) 273 K
D.) 373 K
A pot of water is brought to a boil. The
temperature of the water when it started to
boil was 100.0ºC. What do you expect the
thermometer to read after boiling for 15
minutes?
A.) Below 100.0ºC
B.) 100.0ºC
C.) 105.0ºC
D.) 115.0ºC
E.) Above 115.0ºC
As a solid substance absorbs heat
at its melting point, the melting
point will
A.) decrease
B.) increase
C.) remain the same
The graph represents the uniform heating of
a solid, starting below its melting point.
Which portion of the graph shows the solid
and liquid phases of the substance existing
in equilibrium?
A.) AB
S
B.) BC S,L
C.) CD L
D.) DE L,G
E.) EF G
The graph shown represents the relationship
between temperature and time as heat is added
uniformly to a substance, starting when the
substance is a solid below its melting point. Which
portions of the graph represent times when heat is
absorbed and potential energy increases while
kinetic energy remains constant?
A.) A and B
B.) B and D
C.) A and C
D.) C and D
Potential energy changes when
temperature (KE) does not
The graph represents the uniform cooling of
a substance, starting with the substance as
a gas above its boiling point. During which
interval is the substance completely in the
liquid phase?
A.) AB G
B.) BC G,L
C.) CD L
D.) DE L,S
The graph (see image) represents the uniform
heating of a substance, starting with the substance
as a solid below its melting point.
Which line segment represents an increase in
potential energy and no change in average kinetic
energy?
Temperature
(KE) changes on
the slants,
Potential Energy
on the Plateus
As ice melts at standard pressure,
its temperature remains at 0ºC
until it has completely melted. Its
potential energy
A.) decreases
B.) increases
C.) remains the same
The particles move further apart, but the
kinetic energy remains the same
The heat of fusion is defined as
the energy required at constant
temperature to change 1 unit mass
of a
A.) gas to a liquid
B.) gas to a solid
C.) solid to a gas
D.) solid to a liquid Melting/Fusion
In which equation does the term
"heat" represent heat of fusion?
Heat of Vaporization
What amount of heat is required to
completely melt a 29.95 gram
sample of H2O(s) at 0ºC?
A.) 334 J
B.) 2260 J
C.) 1.00 × 103 J
D.) 1.00 × 104 J
Q = mHfus
= (29.95g)(334J/g)
How much energy is released
when 36.0 grams of steam
condenses into liquid water?
A.) 12.0 kJ
B.) 81.4 kJ
C.) 195 kJ
D.) 1580 kJ
Q = mHvap
= (36.0g)(2260J/g)
How many joules are needed to vaporize
2.00 g of liquid ethanol at its boiling point,
78.0ºC? (The heat of vaporization for
ethanol is 854 J/g)
A.) 156
B.) 540
C.) 854
D.) 1710
Q = mHvap
= (2.00g)(854J/g)
Temperature is not included
as this is a phase change (it
will remain at 78)
As the temperature of a liquid
increases, its vapor pressure
A.) decreases
B.) increases
C.) remains the same
As the pressure on the surface of a
liquid decreases (atmospheric
pressure), the temperature at
which the liquid will boil
A.) decreases
B.) increases
C.) remains the same
The atmospheric pressure is lower, meaning
that the vapor pressure will be lower, and will
cause boiling to occur at a lower temperature