Do Now:
Drop
off your stuff and
head over to Banneker
for a mini-lab
Do Now:
1.
2.
What are the states of matter?
What processes exist that
change states of matter?
Do Now (2/22/12):
Please
come in quietly
and clear your desks of
everything except your
notecard, writing
utensil, and calculator.
Thanks!
Do Now:
1.
2.
3.
What is a phase change?
Do we need heat to cause a phase change?
Is there a temperature change during a phase
change?
Phase Changes
2/25/11
Brainstorm:
1.
2.
What are the states of matter?
What processes exist that
change states of matter?
States of Matter
Three
states of matter:
Solid, liquid, and gas
Phase change: any
transition between two
states of matter
Fusion
Transition
from a
liquid to a solid
state; occurs at the
melting point (0˚C
for water)
Vaporization
Transition
from a
liquid to a gaseous
state; occurs at the
boiling point (100˚C
for water)
Melting
Transition
from a solid
to a liquid state;
occurs at the melting
point (0˚C for water)
Condensation
Transition
from a
gaseous state to a
liquid state; occurs at
the boiling point
(100˚C for water)
Evaporation
The random escape of
molecules from the surface of
a liquid – NOT the same
thing as vaporization, which
occurs only at 100˚C
Temperature changes
THERE ARE
NO
TEMPERATURE
CHANGES DURING A
PHASE CHANGE!!!!!!!
Do Now (2/23/12):
List
and describe
two of the phase
changes we
discussed yesterday.
Quizzes look
great… keep
up the good
work!!! 
Heat of fusion

The amount of heat required to melt 1 kg of a substance
For ice:
5

Heat required to melt a substance

H f  3.34 x10 J / kg
Q  mH f

To freeze a substance, take this amount of heat away
Example: Fusion
How
much heat is
required to freeze 50 kg
of ice at 0˚C?
Heat of vaporization


The amount of heat required to boil 1 kg of a substance
For water:
H v  2.26 x10 J / kg
6

Heat required to boil a substance
Q  mHv

To condense a substance, take this amount of heat away
Example: Vaporization
How
much heat is
required to boil 50
kg of water at
100˚C?
Phase and Temperature Changes
Please
flip to the
front of your
phase change
sheet

Classwork:
Finish
one example on
your phase change
worksheet
Once you have completed
that, you may work on
your homework.
Classwork:
 Finish
the front of your
phase change worksheet
 Once you have completed
that, you may begin
working on your
homework.
Do Now (2/24/12):
How much heat must be added to
turn 2 kg of ice at -10˚C to ice at 0˚C?
2. How much heat must be added to
turn that ice into liquid water at 0˚C?
3. What is the total heat required?
 *hint – use the back of your phase
changes worksheet!
 Happy Friday!!! 
1.
Heat Diagrams

Use the rest of class to work with your ONE PARTNER
on the assignment “Heat Diagrams.” Include all work,
calculations, and answers, as well as diagrams.
Do Now (2/27/12):
 How
much heat must be
added to turn 4 kg of
water at 10˚C to water
vapor at 120˚C?
 Draw a heat diagram and
set up the equations.
Next Mousetrap Car Deadline
Monday, March
5: Bring
in or email proof (photo
or video) that you have
a vehicle that can roll 1
m. It does not need to
have a mousetrap yet.
Practice:
Finish
Heat Diagram
activity – make sure
ALL heats are
calculated!!!
Work on Homework
Classwork:



Finish Heat Diagram activity – make sure ALL heats are
calculated!!!
Work on Phase Changes worksheet A or B
QUIZ TOMORROW ON PHASE CHANGES AND HEAT
DIAGRAMS!!!!!!
Do Now:

4 kj of heat are added to a 2 kg block of ice at 0˚C. How
much ice will melt?
Do Now (2/28/12):
A physicist plans to change 0.1 kg of ice
at -12 C into 0.1 kg of water at 44C.
1. What is the heat required to bring
the ice to its melting point?
2. What is the heat required to melt
the ice?
3. What is the heat required to raise
the temperature of the melted ice
to 44˚C?
Quiz:

QUIZ TOMORROW: PHASE CHANGES
You
may bring a
notecard! Specific heats
and heats of fusion and
vaporization will be
provided.
Quiz Review:
 Please
use the rest of class to
work on the paper “Phase
Changes Classwork.” You may
work with your peers, but your
work MUST BE YOUR OWN!!!
We will check at the end of class
 In #2: change “0” to “100” Thx!
Do Now (2/29/12):
How
much heat is
released to turn 93
kg of steam at 100˚C
to water at 100˚C?
Happy Leap Day!
Do Now (3/1/12):
 Suppose
you were to add ice to a
cup of room temperature water.
Then, you added the same amount of
ice water (water at 0˚C) to a second
cup of room temperature water.
1. What would happen eventually?
2. In which cup would it happen
faster?
Do Now (3/2/12):
 You
are working in a lab with
Bunsen burners and hot
materials. What are some
good safety precautions and
guidelines you should keep in
mind as you work?
Do Now (3/5/12):
Of
the two labs we did
last week, which did
you like better? Why?
Agenda:
 Finish
lab data
 Work on vocab review
 Check vocab review
 Test review tomorrow!!!!
 Test:Thermodynamics on
WEDNESDAY!!!
 Specific heat lab due Wednesday
Specific Heat Lab – pd. 1
meta Mas
l
s of
inne
r
cup
Mass Mass
of
of
water cup+
water
Mass
of
cup,
water
+
metal
Mass
of
meta
l
Initia
l
temp
wate
r
Initia
l
temp
meta
l
Fina
l
tem
p
Calc.
value
specific
heat
Accep.
value
specific
heat
alumi
num
107
169
186
17
23
100
26
1067
903
coppe 60
r
156.5
217
272
54.5
27
100
30
514.42
450
iron
72.7
125.8
198.5
205.8
7.2
22
100
25
367
385
brass
74.3
178.8
253.1
308.5
55.4
23
100
25
25
376
62
Specific Heat Lab – pd. 2
meta Mass Mass
l
of
of
inne cup+
r
water
cup
Mass
of
Wate
r
Mass
of
cup,
water
+
metal
Mass
of
meta
l
Initia
l
temp
wate
r
Initia Final Calc.
l
tem value
temp p
specific
meta
heat
l
Accep.
value
specific
heat
alumi
num
184.5
194
203
18.5
23
100
28
45.9
903
coppe 62.5
r
203.7
141.2
259.4
55.7
23
100
26
431.9
450
iron
73.3
208.2
134.9
257
54.7
23
100
26
417.92
385
brass
74.7
203.2
128.5
256.7
53.5
26
100
27
138
376
81
Specific Heat Lab – pd. 3
meta Mas
l
s of
inne
r
cup
Mass Mass
of
of
cup+ water
water
Mass
of
cup,
water
+
metal
Mass
of
meta
l
Initia
l
temp
wate
r
Initia
l
temp
meta
l
Fina
l
tem
p
Calc.
value
specific
heat
Accep.
value
specific
heat
alumi
num
73.5
173.6
100.1
191.2
17.6
24
100
27
977
903
coppe 82.2
r
188.5
106.3
247.1
58.6
25
100
28
315.94
450
iron
62.5
196.5
134
152.4
55.3
28
100
30
289.4
385
brass
76
189
113
231.2
42.2
26
100
28
312.39
376
Do NowA:

20 kj of heat are removed from 1.5 kg of ice initially at -29 ˚C.
What is its new temperature?