Module Eleven Lesson One Activity
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Heat and Energy Practice Problems
For most of the heat problems, you will use the equation found below:
Q = Heat Input/Output (Joules)
m = Mass of Substance (grams)
c = Specific Heat Capacity (use your Reference Tables to find!)
T = Change in Temperature (Kelvin or Celsius)
The specific heats for the elements we use will be found in your Chemistry
Reference Tables (in rare exceptions they may be given to you or you may need
to do a quick web search to find them). The specific heat is also abbreviated C
p
on your reference tables (page 1).
1.
Go to your Reference Tables (page 1) and find the specific heats for water
in each phase:
a.
Solid
_________________
b.
Liquid _________________
c.
Gas
_________________
2.
Find the specific heat for the following elements (also on page 1 of the
reference table in the table at the bottom):
a.
Iron
_________________
b.
Aluminum
_________________
c.
Gold
_________________
Now let’s practice with some simple problems! I have given you some hints in
bold to help…
3.
Find the amount of heat energy needed to convert 100 grams (
mass
) of
ice (
use this information to find the specific heat needed
) from the
temperature
(-) 25°C to (-) 50°C.
4.
Using a calorimeter (a way to measure heat), a scientist determined it
required 50
Joules
of energy to convert a 25
gram
sample of gold
(
element name can be used to find the specific heat on the table
)
from one temperature to another. What was the temperature change?
5.
An unknown 10
gram
sample in a lab required 44.9
Joules
of energy to
change the temperature 10
degrees Celsius
. What was the specific heat
of this element? Using the specific heat, find the likely element using your
Reference Table.
Now let’s try few without the hints…
6.
Find the amount of heat energy needed to convert 25 grams of steam
from 115°C to 160°C.
7.
Find the mass of ice that would require 738 joules of energy to move from
(-)100 °C to (-)70°C.
8.
Find the final temperature if a 10 gram sample of aluminum requires
358.8 Joules of energy and begins at 10 °C before it is heated.
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1. Label the following diagrams as endothermic or exothermic reactions.
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AH 0
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Peisalla lamacron
Nar. ,202
Date
Name
Section
galauvinstenos
Pre-Laboratory Assignment
1. Read an authoritative source for a discussion of preparing and interpreting a graph, especially the
extrapolation of a curve.
2. A student determined the calorimeter constant of the calorimeter, using the procedure described in
this module. The student added 50.00 mL of cold water to 50.00 mL of heated, distilled water in a
Styrofoam cup. The initial temperature of the cold water was 21.00 °C and of the hot water, 29.15 °C.
The maximum temperature of the mixture was found to be 24.81 °C. Assume the density of water is
1.00 g mL¯1 and the specific heat is 4.184 J g¯K
gniwollot bns of toh bine
botollon ot ssb om
(1) Determine the AT for the hot water and the cold water.
mit
At cold water = 24.8I- 21,00 = 3.81°COn
आनी
AT hot = 24.81- 29.15 =
- 4.34°C
60.ES
2.0
0LES
8.
0.1
0.0
If
0.8
28.5S
Calculate N
0.4
08.TT
gabxim
02
4.34°C
hot water
81
answer
cold water
381°C
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B)
Zinc (Zn) replaces acid hydrogen.
C)
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D)
Zinc piece does not react with acid solution.
E)
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System
Exo Endo
Explanation
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2. Cooking an egg in
a frying pan.
3. Burning a match.
4. Dynamite explodes
in the destruction
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Question 13
A calorimeter holds 45 g water at 22.0°C. A sample of hot iron is added to the water, and
the final temperature of the water and iron is 28.0°C. What is the change in enthalpy asso-
ciated with the change in the water's temperature?
J
Note: The specific heat of water is 4.18 g°C.
Use the formula AH = -cmAT
Show your work.
Normal
÷
A A
√x
Enter your answer here
中山
2 Tx
BIUS
X
|||
|||
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