Quiz | Chemical Thermodynamics
General Chemistry 3 - Quiz
Which of the following statements best describes the Second Law of Thermodynamics?
Second Law of Thermodynamics: the total entropy of an isolated system can never decrease over time and is constant if all processes are reversible ⇒ the entropy change is never negative: ΔSsystem + ΔSsurrounding ≥ 0
What is the expression of the Gibbs energy change?
Which of the following criteria for reaction spontaneity is incorrect?
ΔGrxn = RT ln
Gibbs criteria for reaction spontaneity:
If Q < K ⇔ ΔGrxn < 0: reaction proceeds spontaneously from left to right
If Q > K ⇔ ΔGrxn > 0: reaction proceeds spontaneously from right to left
If Q = K ⇔ ΔGrxn = 0: reaction is at equilibrium
Which of the following statements is always true when a reversible chemical reaction has attained equilibrium?
What is the relationship between the equilibrium constant K and the temperature T?
ln K = - + ⇒ a plot of ln K versus is linear (ln K and are proportional)
When does the entropy usually increase?
Entropy S is a measure of the amount of disorder in a system ⇒ the greater the disorder the higher the entropy.
The disorder of a system is greatest when a molecule is broken into 2 or more molecules or when a solid turns into a liquid or when a liquid turns into a gas