 Aim:
How well do I know the material from
this unit?
 Do
Now: Take a Calorimetery Worksheet
and Do all Odd problems
 Homework:
1.
2.
Castle Learning Due Tomorrow
STUDY for TEST Tomorrow
 Flammable
 Ice
Ice...?
on Fire Answer
1.
2.
3.
4.
Where is kinetic energy increasing?
Where is potential energy increasing?
Where is the Solid phase only present?
Where is both liquid and gas present at the
same time?
5.
6.
7.
Where is the Heat of Fusion?
Where is the Heat of Vaporization?
Which one requires more energy and how
do you know?
8.
9.
10.
Name the 2 phase changes described in this
graph and describe which line segment
represents each specific change?
Are these 2 phase changes exothermic or
endothermic?
Which point has the lowest kinetic energy?
 Cold
packs are used to treat minor injuries. Some
cold packs contain NH4NO3(s) and a small packet of
water at room temperature before activation. To
activate this type of cold pack, the small packet
must be broken to mix the water and NH4NO3(s).
The temperature of this mixture decreases to
approximately 2°C and remains at this temperature
for 10 to 15 minutes.
13.
State the direction of heat flow that occurs when
the activated cold pack is applied to the body.
 Which
change results in a release of energy?
1. the
melting of H2O(s)
2. the boiling of water ()
3. the evaporation of H2O()
4. the condensation of H2O(g)
 Answer
=4
 If
two systems at different temperatures
have contact with each other, heat will flow
from the system at
1. 20°C
to
2. 30°C to
3. 40°C to
4. 50°C to
a
a
a
a
Answer = 3
system
system
system
system
at 303 K
at 313 K
at 293 K
at 333 K
 During
which change is energy absorbed?
1. the
melting of ice
2. the cooling of ice
3. the freezing of water
4. the condensation of water
 Answer
=1
 Two
pure water samples held in separate
containers at one atmosphere pressure must
have molecules possessing the same average
kinetic energy if the samples have the same
1. volume
2. temperature
3. mass
4. density
 Answer
=2
 The
amount of heat needed to change 1
gram of a solid to 1 gram of a liquid at
constant temperature is called the heat of
1. vaporization
2. sublimation
3. fusion
4. fission
 Answer
=3
 The
average kinetic energy of water
molecules is greatest in which of these
samples?
1. 10
g of water at 35°C
2. 10 g of water at 55°C
3. 100 g of water at 25°C
4. 100 g of water at 45°C
 The
temperature of a piece of Metal with a
mass of 95.4g increases from 25.0°C to
48.0°C as the metal absorbs 849 J of heat.
What is the specific heat of Metal X?
 0.387
J/g°C
 How
much energy is required to vaporize
10.g of water at its boiling point?
q
= 22600j or 22.6kJ
 How
much energy is released when 20. g of
water is frozen at 0ºC?
q
= 6680j or 6.68kJ
 Calculate
the amount of heat needed to
increase the temperature of 250g of water
from 20oC to 46oC. Write your answer in
kiloJoules.
q
= 37,620J or 38kJ
 The
temperature of 15 grams of water
increased 3.0°C. How much heat was
absorbed by the water?
 216
J of energy is required to raise the
temperature of aluminum from 15o to 35oC.
Calculate the mass of aluminum.
(Specific Heat Capacity of aluminum is 0.90)
 m=
12g
 How
much energy is required to melt 10.g of
ice at its melting point?
q
= 3340J or 3.34kJ
 The
initial temperature of 150g of ethanol
was 22oC. What will be the final temperature
of the ethanol if 3240 J was needed to raise
the temperature of the ethanol?
(Specific heat capacity of ethanol is 2.44)
T
= 8.85oC
 Tfinal= 22oC +8.85oC= 30.9oC
 Based
on data collected during a laboratory
investigation, a student determined an
experimental value of 322 joules per gram
for the heat of fusion of H2O. Calculate the
student’s percent error.
 Answer:
3.6%
 How
much energy is released when 20. g of
steam is condensed at 100ºC?
q
= 45200j or 45.2kJ
 Which
measurement has the greatest number
of significant figures?
1. 6.060
mg
2. 60.6 mg
3. 606 mg
4. 60600 mg
 Expressed
to the correct number of
significant figures, the sum of two masses is
445.2 grams. Which two masses produce this
answer?
1. 210.10
g + 235.100 g
2. 210.100 g + 235.10 g
3. 210.1 g + 235.1 g
4. 210.10 g + 235.10 g
 When
sodium chloride is dissolved in water,
the resulting solution is classified as a
1. heterogeneous
compound
2. homogeneous compound
3. heterogeneous mixture
4. homogeneous mixture
 During
fractional distillation, hydrocarbons
are separated according to their
1. boiling
points
2. melting points
3. triple points
4. saturation points
 An
example of a physical property of an
element is the element’s ability to
1. react
with an acid
2. react with oxygen
3. form a compound with chlorine
4. form an aqueous solution
 Which
substance cannot be decomposed into
simpler substances?
1. ammonia
2. aluminum
3. methane
4. methanol
A sample of water is heated from a liquid at 40°C to
a gas at 110°C. The graph of the heating curve is
shown below.
11. For section QR of the graph, state what is happening
to the water molecules as heat is added.
12. For section RS of the graph, state what is happening
to the water molecules as heat is added.
