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WorksheetsThermochemistry
Total questions: 10
Worksheet time: 30mins
Name
Class
Date
1.
The specific heat of aluminum is 0.21 J/g°C. How much heat(Q) is released when a 10 g piece of aluminum foil is taken out of the oven and cools from 100° to 50°?
a)
105 J
b)
10.5 J
c)
1.05 J
d)
0.105 J
2.
20 g of water. specific heat of water is 4.18 J/g°C. temperature changes from 25° C to 20° C, how much heat energy (q) moves from the water to the surroundings?
a)
400 J
b)
210 J
c)
80 J
d)
4.18 J
3.
What does temperature measure?
a)
Heat
b)
ºC
c)
Kinetic Energy
d)
Thermal Energy
4.
In an endothermic reaction the system is releasing energy.
a)
True
b)
False
5.
For an endothermic reaction, the heat is on the ____ side.
a)
reactant
b)
product
c)
either side
6.
For an exothermic reaction, the heat is on the ____ side
a)
reactant
b)
product
c)
either side
7.
What type of reaction is shown in the picture?
a)
endothermic
b)
exothermic
8.
In an exothermic process, the surroundings are are gaining energy.
a)
True
b)
False
9.
If two objects have different temperatures, heat will flow from the warmer object to the cooler one UNTIL ____________
a)
one reaches a temperature of zero
b)
they both have an equal temperature
c)
one runs out of energy
10.
What is the specific heat of an unknown substance if 100.0 g of it at 200.0 °C reaches an equilibrium temperature of 27.1 °C when it comes in contact with a calorimeter of water. The water weighs 75. g and had an initial temperature of 20.00 °C? (Specific heat of water is 4.18 J/g°C) (show your work)
a)
0.111 J/g°C
b)
1.29 J/g°C
c)
0.129 J/g°C
d)
22225.85 J
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