Multiple Choice
In order to calculate ΔH° for a reaction which of the following sets represents numerical values that would be required?
19. Chemical Thermodynamics
Entropy
Back19. Chemical Thermodynamics
Entropy
- Multiple ChoiceWhich of the following terms best describes entropy in a thermodynamic system?
- Multiple ChoiceIn general chemistry, which word or phrase best describes entropy?
- Open QuestionEntropy measures ____. (1 point)
- Open QuestionThe measure of disorder in a system is its __________1views
- Open Question
Classify the phase changes by the signs of the system's ΔH° and ΔS°.
- Multiple Choice
An ideal gas is allowed to expand at constant temperature. What are the signs of ∆H, ∆S & ∆G.
6views - Multiple ChoiceFor a pure substance at the same temperature, which phase has the highest entropy?
- Open QuestionWithout doing any calculations, determine the sign of δssys for each of the following chemical reactions.
- Multiple ChoiceFor a pure substance at the same temperature and pressure, which state of matter generally has the greatest entropy?1views
- Open Question
What will the sign on ∆S be for the following reaction and why? 2 Mg(s) + O2(g) → 2 MgO(s)
- Multiple ChoiceCalculate the equilibrium constant for the formation of NO2 (g) from NO (g) and O2 (g) at 405 K.
2 NO (g) + O2 (g) → 2 NO2 (g)
- Multiple ChoiceUsing standard enthalpy and entropy values, calculate ΔG for the production of NH4NO3 at 20.0℃.
2 NH3 (g) + 2 O2 (g) → NH4NO3 (s) + H2O (l)
- Open Question
Which of the following has the largest standard molar entropy, S° (298.15 K)?
- Multiple Choice
Identify sign of entropy changes for the following processes.
1) freezing water to form ice
2) ideal gas allowed to expand in a closed container at constant T
3) mixing of two gases into one container
4) NH2 (g) (1atm) → NH2 (g) (3 atm)
5) gas mixture transferred from larger to smaller container
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