Entropy Change for Vaporization, Free Energy, Spontaneous, Reaction – Chemistry
The key terms in this Chemistry course include Entropy Change, Vaporization, Substance, Free Energy, Spontaneous, Reaction, Enthalpy, Entropy, Endothermic, Heat, Sample, Equilibrium, Ammonia, ∆Go, Temperature, ∆H , ∆S , Mixture, ∆H˚, Boiling Point, Methanol, Dissociation, Internal Energy.
For any substance, the entropy change for vaporization is significantly higher than the entropy change for melting because _____________________.
particles in a gas state occupy much larger volume compared to a solid or liquid state
Consider the free energy diagram for the reaction R → P shown below. The reaction is _______, the equilibrium position is indicated by letter __________ and at point I__________.
spontaneous, III, ΔG < 0
Consider the following reaction:
2NO2(g) ⇌ 2NO(g) + O2(g)
Which of the following statements would indicate that this reaction is NOT spontaneous at room temperature?
∆H > 0 and | ∆S | < |∆Ssurr |
If for a certain reaction mixture ΔGo>0 and ΔG <0, which of the following statements about this reaction mixture is true?
From this mixture the reaction will proceed forward to reach equilibrium and K <1 for the reaction.
Which one of the following reactions do you expect to exhibit a decrease in entropy?
CH2O (g) + O2 (g) → H2O (l) + CO2 (g)
Consider the table of thermodynamic data table below to find the value of ∆Go for the formation of ammonia gas (1 mol) at 375K?
-8.7 kJ/mol
Which of the following must be true for a spontaneous endothermic process?
ΔS > 0 and | ΔS | > | ΔSSURR |
What is the free energy, per mole, to transport sodium ions up a concentration gradient from 0.020M to 0.080M at 37oC?
3.6 kJ
Which of the following correctly expresses the relationship between the enthalpy of a system and the entropy of the surroundings?
∆SSURR˚ = -∆H˚/T
The normal boiling point of a substance is defined to be the temperature at which the liquid phase of the substance is in equilibrium with the gas phase at 1 atm pressure. The normal boiling point of methanol is 80oC and ∆H vap = 38 kJ/mol. What is the ∆Svap value?
110 J/mol-K
At 8oC the pH of pure water is 7.31. What is ΔGo for water dissociation at this temperature?
78.6 kJ/mol
If a chemical reaction results in a gas expansion we say that work is done________ and the sign of the work is __________.
by the system, w < 0
What is the change in internal energy of a sample of gas if it does 9 kJ of work and at the same time 15 kJ of heat is transferred to the sample?
+6 kJ
What can you say about the entropy change in the following reaction?
ΔS > 0, ΔSSURR < 0, ΔSUNIVERSE is unknown