| Assessment Questions: 20 results |
Thermochemistry : PhaseChanges (8 Variations)
Steam at 100oC is condensed by an ice-water mixture at 0oC. Assuming that there is still ice present when the process is over, how much ice will be melted if 10.0 g of steam is condensed? The following may be useful:
enthalpy of vaporization of water = 40.7 kJ/mol; enthalpy of fusion of water = 6.07 kJ/mol; specific heat capacity of water = 4.184 J/g•K.
Calorimetry / Thermochemistry |
Phases / Phase Transitions / Diagrams
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Thermodynamics : EntropyPhaseChange (13 Variations)
Aluminum can be evaporated in a vacuum to form highly reflective coatings. Aluminum boils at 2792K and has a heat of vaporization of 70.0 kcal/mol. Calculate the entropy change for the vaporization of one mole of aluminum.
Thermodynamics |
Chemometrics |
Phases / Phase Transitions / Diagrams
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Matter_and_Measurement : ElementState (10 Variations)
Identify how each of the following elements exist under normal conditions.
Phases / Phase Transitions / Diagrams
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Matter_and_Measurement : PhaseProperties (10 Variations)
Does the following statement apply to solids, liquids, or gases?
It has a fixed volume.
Phases / Phase Transitions / Diagrams
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Intermolecular_Forces__Liquids_and_Solids : PhaseDiagrams (6 Variations)
Match the following conditions to the physical state of the contents of the vessel.
Click here to open the phase diagram.
Phases / Phase Transitions / Diagrams
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Thermochemistry : PhaseChangeEnthalpy (10 Variations)
A solid melts to a liquid. Which of the following statements are true? (Assume constant pressure and a flexible container.)
Calorimetry / Thermochemistry |
Phases / Phase Transitions / Diagrams
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Intermolecular_Forces__Liquids_and_Solids : PhaseEnergyChanges (6 Variations)
When a liquid is transformed into its vapor at constant temperature,
Phases / Phase Transitions / Diagrams |
Calorimetry / Thermochemistry
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Thermodynamics : CompareEntropyQual (16 Variations)
Indicate which substance in each of the following pairs of substances you expect to have higher entropy. Assume that you have a mole of each substance and all substances are at the same temperature.
Thermodynamics
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Thermodynamics : PredictEntropyChange (10 Variations)
For each of the following processes, indicate whether you expect the entropy change of the system to be positive or negative.
Thermodynamics
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Thermodynamics : ConservGibbsEnergy (6 Variations)
Which of the following best illustrates conservation of Gibbs free energy?
Thermodynamics
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Thermodynamics : GeneralThermo (6 Variations)
Which of the following statements is an inaccurate statement about thermodynamics?
Thermodynamics
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Thermodynamics : ProbabilityEnergyDist (23 Variations)
Consider a system that has two indistinguishable molecules that can occupy three different energy levels (having energies of 1kJ, 2kJ and 3kJ, respectively). What is the probability that the molecules will have a total energy of 2 kJ?
Thermodynamics
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Thermodynamics : InterpretKandDeltaG (16 Variations)
The thermodynamic equilibrium constant for the following reaction is 0.15 at 1227°C.
2 SO2(g) + O2(g) 
2 SO3(g)
Check the box for each true statement.
Thermodynamics
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Thermodynamics : ThermoKinStability (4 Variations)
Compare white and grey tin, both of which exist as solid phases of tin near room temperature.
| Phase
|
 Hof (kJ/mol)
|
So (J/(K*mol))
|
| white tin
|
0
|
51.5
|
| grey tin
|
-2.1
|
44.8
|
Which type of stability does each exhibit at 40 oC?
white tin {1:MULTICHOICE:kinetically stable#No, that's incorrect.~=thermodynamically stable#Correct!}
grey tin {1:MULTICHOICE:=kinetically stable#Correct!~thermodynamically stable#No, that's incorrect.}
Thermodynamics
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Thermodynamics : CalcDeltaG (14 Variations)
Using  , calculate the Gibbs free energy change for the following reaction which produces the metal zinc from its ore zinc(II) oxide.
2 ZnO(s)  2 Zn(s) + O2(g)
Thermodynamics |
Chemometrics
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Thermodynamics : CalcDeltaS (9 Variations)
Using , calculate the entropy change for the reaction.
Thermodynamics |
Chemometrics
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Thermodynamics : CalcMinSpontTemp (9 Variations)
Calculate the minimum temperature above which the following reaction will be product-favored (spontaneous).
Thermodynamics |
Chemometrics
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Thermodynamics : DetermineRxnFavored (8 Variations)
When industrial plants burn coal, sulfur dioxide is produced. Sulfur dioxide is a primary pollutant that contributes to both industrial smog and acid rain. Is this process of producing sulfur dioxide product-favored?
Using
Thermodynamics |
Chemometrics
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Thermodynamics : GibbsFromHSandT (5 Variations)
On the space shuttle, the carbon dioxide produced by the astronauts is handled by an environmental control system that utilizes the following reaction.
H° = -138.4 kJ and S° = -139 J/K
Calculate G° at 25°C for this reaction.
Thermodynamics |
Chemometrics
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Thermodynamics : ATPFromGlucose (8 Variations)
When glucose is oxidized in the human body it releases a lot of Gibbs free energy. Rather than waste this free energy, the body stores much of it in the form of ATP. The following reaction shows this process of storing some of the energy from glucose in ATP. This is an example of coupled reactions in a biological system.
The label on a can of Coke says that it contains 39 g of sugar. Assume that all of the sugar is glucose (even though it isn't), and calculate how many moles of ATP can be produced theoretically by the oxidation of 39.0 g of glucose.
Thermodynamics |
Reactions |
Chemometrics
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