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WorksheetsThermochemistry
Total questions: 15
Worksheet time: 47mins
Name
Class
Date
1.
In an exothermic process the surrounding looses heat.
a)
True
b)
False
2.
In an endothermic reaction the system is releasing energy.
a)
True
b)
False
3.
Is the combustion of gasoline endothermic or exothermic?
a)
Endothermic
b)
Exothermic
4.
As someone is running on the track they begin to perspire. If the runner is our system, are they endothermic or exothermic?
a)
Endothermic process
b)
Exothermic process
5.
A reaction is performed in a beaker with a temperature probe recording the temperature changes of the reaction. If the temperature began at 15.0 degrees Celsius and ended at 27.5 degrees Celsius. If the reaction is our system, is the system endothermic or exothermic?
a)
Exothermic
b)
Endothermic
6.
Refer the the following question:
2N2 + 3H2 --> 2NH3 + 46 kJ
How much energy would be produced if only 1 mol of nitrogen was reacted?
2N2 + 3H2 --> 2NH3 + 46 kJ
How much energy would be produced if only 1 mol of nitrogen was reacted?
a)
92 kJ
b)
0.143 kJ
c)
23 kJ
d)
15 kJ
7.
How much energy must be used to produce 4.75 mol of gaseous water?
H2O (l) + 44.0 kJ --> H2O (g)
H2O (l) + 44.0 kJ --> H2O (g)
a)
207 kJ
b)
9.36 kJ
c)
206.8 kJ
d)
9.362 kJ
8.
What mass of P4 must be reacted to produce 5905 kJ of energy?
P4 + 6Cl2 --> 4PCl3 + 2439 kJ
P4 + 6Cl2 --> 4PCl3 + 2439 kJ
a)
25.43 g
b)
563.0 g
c)
2.421 g
d)
300.0 g
9.
Do reactants in an endothermic reaction have a higher or lower energy than the products?
a)
Higher
b)
Lower
10.
Do the reactants in an exothermic reaction have a higher or lower energy than the products?
a)
Higher
b)
Lower
11.
4 PCl5 + 3438 kJ --> P4 + 10 Cl2
How much energy is required to produce each mole of chlorine?
How much energy is required to produce each mole of chlorine?
a)
687.6 kJ
b)
859.5 kJ
c)
343.8 kJ
d)
245.8 kJ
12.
In a laboratory experiment a student was using Styrofoam cups and foil to reduce the energy lost during an exothermic reaction. The reaction constantly had a temperature probe in it. Towards the end of the reaction the student noticed the temperature in the cups was going down (opposite what they thought is should). The student concluded that the energy was destroyed within the system. This student's reasoning violates what law?
a)
Law of Conservation of Mass
b)
Law of Enthalpy
c)
First Law of Thermodynamics
d)
Law of Heat Transfer
13.
During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______.
a)
Warm
b)
Cold
c)
Bubbly
d)
Damp
14.
H2 + Cl2 --> 2 HCl + 1845 kJ
Is this reaction endothermic or exothermic?
Is this reaction endothermic or exothermic?
a)
Endothermic
b)
Exothermic
15.
H2 + 2 C + N2 + 270.3 kJ --> 2 HCN
Is this reaction endothermic or exothermic?
Is this reaction endothermic or exothermic?
a)
Endothermic
b)
Exothermic
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