WorksheetsThermodynamics
Total questions: 14
Worksheet time: 10mins
A piston–cylinder device contains a liquid–vapor mixture of water at 300 K. During a constant-pressure process, 750 kJ of heat is transferred to the water. As a result, part of the liquid in the cylinder vaporizes. Determine the entropy change of the water during this process.
2.5 kJ/K
25 kJ/K
0.4 K/kJ
40 K/kJ
A heat source at 800 K loses 2000 kJ of heat to a sink at (a) 500 K and (b) 750 K. Determine which heat transfer process is more irreversible.
a
b
Entropy is a measure of the number of ways in which energy is distributed.
True
False
Entropy of a system increases when it gains energy.
True
False
Entropy of a system increases when a reaction increases the number of particles.
True
False
In a spontaneous process, the entropy of the universe decreases.
True
False
We can reverse a spontaneous process by intervening (eg applying heat, using distillation to separate mixtures).
True
False
What information do we need to perform a calculation of Gibbs Free Energy?
Enthalpy of the reaction.
Entropy of the reaction.
The temperature of the reaction in Kelvin.
All of the above are needed.
Which of the following situations demonstrates high entropy?
water freezing
water vaporizing
steam condensing to water
Which of the following would have the highest entropy?
A cold solid
A hot liquid
A hot gas
A cold gas
