記憶度
15問
35問
0問
0問
0問
アカウント登録して、解答結果を保存しよう
問題一覧
1
Which of the following postulates of the Kinetic Molecular Theory best qualitatively explains why gases are easily compressed?
The volume of the particles is negligible compared to the total volume occupied.
2
Which of the following pairs is directly proportional for an ideal gas?
v and T^1/2
3
What is the partial pressure (torr) of methane in a 100-g mixture of methane and argon (39.95 g/mol) if it is found that argon is 10% by mass and the total pressure is 250 torr?
239
4
What is the mole fraction of water vapor at SATP and 85% relative humidity if the saturated vapor pressure is 23.756 mmHg?
0.027
5
At standard conditions, 45 L of oxygen gas weighs about 64 g, whereas 45 L of hydrogen weighs only about 4 g. Which gas diffuses faster? By how much?
hydrogen, 4r(oxygen gas)
6
At what altitude will the pressure of air (28.8 g/mol) be three-fourths of its pressure at sea level Assume that temperature does not change at 28°C.
2.55 km
7
I, II, and III
8
-0.122
9
The value of Joule-Thomson Coefficient is 0.24 K/atm
10
What is the value of the Joule-Thomson coefficient (deg/atm) and the correct interpretation given the data above?
3.5, gas cools upon expansion
11
The system has lost heat.
12
Suppose a 1-mol sample of an ideal gas is expanded isothermally and reversibly from 10 to 20 L at 298 K. How much work is associated in this process?
-1720 J
13
A 2-mol sample of an ideal gas is isothermally and irreversibly expanded from 10 to 1 atm. The external pressure is 1 atm at 300 K. Calculate the work done.
-4482 J
14
Consider 1.0 mol of van der Waals gas expanded isothermally at 298 K and reversibly from 3 L to 10 L. What is the value of W?
-2981.7 J
15
A 1.50-mol sample of an ideal gas at 245 K and 0.75 bar is altered by some process that takes it to a state in which its temperature is increased to 295 K and its pressure is increased to 0.90 bar. What will be the ΔH of the gas in this process?
1.56 kJ
16
I is endothermic and Il is exothermic.
17
In a constant volume reaction where gases are involved, which of the following conditions can ensure that ΔH will be equal to ΔU?
Moles of gaseous products is equal to that of the reactants.
18
57.07
19
What will be the final temperature of the system when 100 g of ice at 273.15 K is put in 500 g of water at 293 K?
276.3 K
20
What is the value of the standard enthalpy (kJ/mol) of the decomposition of methanol to formaldehyde and hydrogen given the following standard enthalpies of combustion?
129
21
Rapid expansion of gas and recompression to its original conditions.
22
Which of the following would have the most positive value of ΔS°?
NaNO3(s) ---> Na+ (aq) + NO3- (aq)
23
A perpetual motion machine capable of generating increasing amounts of energy without interacting with its surroundings cannot exist. This is best explained by _________________.
First Law of Thermodynamics
24
8.6424
25
What is the standard entropy (J/mol•K) of the formation of hydrogen chloride from hydrogen and chlorine gases? The standard entropies of hydrogen, chlorine, and hydrogen chloride are 130.6, 223.0, and 186.7 J/mol•K, respectively.
9.9
26
24
27
0
28
736
29
What is the entropy change of the system (J/K) when 100 g of ice at 273.15 K is put in 500 g of water at 293 K?
5.1
30
All of the choices.
31
In which of the following conditions will adsorption most likely occur?
exothermic and low temperature
32
Which of the following gases will most likely be adsorbed by activated charcoal?
SO2
33
What is the percentage of the surface area of the solid occupied if the Langmuir constant is 3.5 L/mg and the concentration at equilibrium is 0.50 mg/L?
64
34
A surface is half-covered by a gas when the pressure is 1 bar. What will be the fraction covered when the gas has a pressure of 0.1 bar?
0.09
35
decrease the temperature
36
Which is the most probable value of the Freundlich constant "n"?
1.25
37
heterogeneous catalysis
38
Consider the gold numbers of the given substances. Arrange the substances in increasing protective power.
PS < SO < GA < G
39
Consider the gold numbers of the given substances. How much dried gelatin is needed to prevent coagulation of 10 mL standard gold sol?
0.01 mg
40
homogeneous catalysis
41
Which mode of radioactive decay is most likely for the C-14 isotope?
beta
42
What percentage of the substance will be decayed after 30 minutes If its half-life is 47 minutes?
36
43
How much energy (MeV) is released when the nuclei of Deuterium (2.0141) and Tritium (3.0160) fuse to make an alpha particle (4.0026)?
17.6
44
Which of the following should be the characteristic(s) of the graph of the probability distribution function of the main energy level? |. continuous Il. conditional III. symmetric
I and III
45
What is the approximate radius of the third main shell of a hydrogen-like atom?
0.48 nm
46
A 589-nm light passes through honey (n = 1.5), what is its new wavelength in nm?
393
47
In quantum theory, which of the following tells us that the predictions of quantum mechanics must pass smoothly into those of the classical whenever there is a progression from micro to macroscopic?
Correspondence principle
48
How many kinetic energy terms are in the Schrodinger Equation in a molecule of hydrogen if the Born-Oppenheimer Approximation is used?
2
49
What is the eigenvalue of the function f(x) = sin(x) + cos(x) operated using the second derivative?
-1
50
How many radial nodes are there in a 3d orbital?
0
51
What is the maximum energy change that can be extracted as work at 298 K for the combustion of glucose?
-2234
52
temperature
53
I, II, and III
54
What are the signs of ΔG, ΔH, and ΔS of the vaporization of water?
-, +, +
55
0.0042
56
Consider a 2-ohm and 3-ohm resistors that are connected in parallel. The two resistors are in series with another 1-ohm resistor. If the circuit runs on a 3-A current, what is the potential of the circuit?
6.60 V
57
What is the identity of a metal that is dissolved in wastewater and was identified using electrolysis? The mass deposited in the electrode is 0.30 g over 75 mA current in an hour.
silver
58
The molar conductivity of KCI solution is greater than that of NH3 solution.
59
B
60
0.65
61
Neither I nor II
62
dipole moments
63
ethane
64
heptane at 30°C
65
J/m2
66
What is the viscosity of a liquid that flows through a 10-cm long and 0.5-mm diameter capillary tube at a rate of 1.5 mL/s at 1 atm?
1.04 cP
67
What is the surface tension of a liquid (ρ = 0.83 g/mL) in a 1-mm diameter capillary tube if it rose 3 cm from the initial liquid surface?
0.061 N/m
68
Thirty drops of the liquid weighs 5.1 g. Using the drop weight method, calculate the surface tension of a liquid drop if the capillary radius is 4.2 mm.
0.063 J/m^2
69
1.11
70
higher energy is required to bring particles to surface and higher surface tension.
71
3
72
If N2 is heated from 60K to 70 K at 0.100 atm, it sublimes.
73
For temperatures between the freezing and boiling points, the liquid potential is the least.
74
What is the experimental enthalpy of vaporization (kJ/mol)?
1.27
75
The vapor pressures of liquids A and B at ambient temperature are 581 and 397 mmHg, respectively. The mole fraction of A in the vapor phase is 0.32. What is the tot pressure (mmHg) of the vapor mixture?
442
76
According to Henry's Law, at a fixed temperature, the amount of gas dissolved in a given quantity of solvent is proportional to the
partial pressure of gas above the solution.
77
1
78
320 K
79
Which liquids are completely miscible?
butyric acid and decanol
80
When XB > 0.55, the liquid solution is nearly all A.
81
Consider a 0.005 m calcium chloride solution. What is the ionic strength?
0.015
82
Consider a 0.005 m calcium chloride solution. What is the mean activity coefficient?
0.75
83
Consider a 0.005 m calcium chloride solution. What is the activity?
2.10 E-7
84
Log of activity is one of the terms of the Debye-Hückel Limiting Law.
85
4.84°C
86
80.4°C
87
What is the percent ionization of a 0.26 m solution of weak base if it freezes at -0.56°C?
16
88
None of the choices.
89
What is the osmotic pressure of a 0.10 M sodium phosphate solution at 20°C?
9.6 atm
90
What is the process of determining the lowered freezing point of a liquid with dissolved solute to further determine its molecular mass?
Cryoscopy
91
The rate of disappearance of A is a third of the rate of appearance of C.
92
k1 > k2
93
Dinitrogen pentoxide is decomposed into nitrogen dioxide and oxygen. What is the rate of formation of oxygen if 0.08 mole of dinitrogen pentoxide is consumed in a 4.0 L container every 0.20 seconds?
0.05 M/s
94
In a first order reaction, which reaction characteristic varies as the reaction progresses?
reaction rate
95
Reactants A and B forms products. Determine the rate law of the reaction.
A
96
In a first order reaction, the time required for half of an initial amount to decompose is 3 min. If initially, there is 1 M of A, how long will it take to reduce the concentration of A to 0.25 M?
6.0 min
97
0.0019
98
What is the value of the activation energy (kJ/mol) given the following data?
187
99
It takes about 3.2 minutes to cook a hard-boiled egg in Southern Luzon, but at the higher altitude of Northern Luzon, where water boils at 92°C, the cooking time is 4.8 minutes. Estimate the activation energy (kJ/mol) for the coagulation of egg albumin protein.
57.3