WorksheetsEnthalpy, Entropy, and Gibbs Free Energy
Total questions: 15
Worksheet time: 17mins
Name
Class
Date
1.
Entropy is a measure of the number of possible ways that the energy of a system can be distributed.
a)
true
b)
false
2.
The SI unit of heat and energy is the __________.
a)
calorie
b)
heat
c)
joule
d)
watt
3.
The amount of energy required to raise the temperature of one gram of pure water by one degree Celsius is defined as:
a)
a joule
b)
a watt
c)
a calorie
d)
heat
4.
The __________ law of thermodynamics states that entropy is always increasing.
a)
first
b)
second
c)
third
d)
zeroth
5.
Heat transfer [blank] occurs from hot to cold.
a)
always
b)
never
c)
sometimes
d)
rarely
6.
Which substance is the better conductor?
a)
steel
b)
gold
c)
wood
d)
aluminum
7.
Temperature is a measure of average [blank] energy of individual atoms.
a)
heat
b)
potential
c)
mechanical
d)
kinetic
8.
ΔH value in an endothermic reaction is a positive number.
a)
True
b)
False
9.
Which phase of matter has the greatest motion and least orderly arrangement?
a)
solid
b)
liquid
c)
gas
10.
The equation that relates enthalpy, temperature and entropy is
a)
Hess's Law
b)
Second Law of Thermodynamics
c)
Gibbs Free Energy
d)
Calorimetry
11.
True/False: The rate of a chemical reaction is unrelated to the spontaneity of the reaction.
a)
True
b)
False
12.
A catalyst works by
a)
changing the order of the reaction
b)
increasing the temperature
c)
lowering the activation energy
d)
making the activated complex
13.
If 25 J are required to change the temperature of 5.0 g of substance A by 2.0°C, what is the specific heat of substance A?
a)
250 J/g C
b)
10 J/g C
c)
63 J/g C
d)
2.5 J/g C
14.
For which of these processes is the value of ΔH expected to be positive?
1. The temperature increases when calcium chloride dissolves in water.
2. Steam condenses to liquid water
3. Water boils
4. Dry ice sublimates
1. The temperature increases when calcium chloride dissolves in water.
2. Steam condenses to liquid water
3. Water boils
4. Dry ice sublimates
a)
4 only
b)
1 only
c)
3 and 4 only
d)
2 and 3 only
15.
6. The formation ½ A2 + 2 B2 + C --> CAB4 has an enthalpy of formation of -104 kJ and a change in entropy of -60.8 J/K at 30 °C. What is the free energy and spontaneity of the reaction?
a)
-85.6 kJ, spontaneous
b)
-18.3 kJ, not spontaneous
c)
+18.3 kJ, spontaneous
d)
+85.6 kJ, not spontaneous
100 %
