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Return to Foundations of Surface Science 1e Student Resources
Chapter 1 Multiple Choice Questions
Quiz Content
*
not completed
.
Which of these properties is proportional to the area of a given surface?
Specific surface energy
correct
incorrect
Surface strain
correct
incorrect
Surface excess entropy
correct
incorrect
Surface tension
correct
incorrect
Surface stress
correct
incorrect
*
not completed
.
Which of the following statements is necessarily true when measuring surface stress relative to the principal stress axes on any given surface?
The normal stress components are equal
correct
incorrect
The shear stress components are maximised
correct
incorrect
The shear stress components are zero
correct
incorrect
The normal and shear stresses are equal
correct
incorrect
The normal stress components are zero
correct
incorrect
*
not completed
.
A Wilhelmy plate, of negligible thickness and with lateral dimension 1.0 cm, is partially immersed in warm olive oil (surface tension 0.031 J.m
-2
). After correction for buoyancy effects, the increase in apparent weight of the plate is 0.60 mN. Which of the following contact angles between plate and liquid is most consistent with these results?
0⁰
correct
incorrect
15⁰
correct
incorrect
30⁰
correct
incorrect
45⁰
correct
incorrect
60⁰
correct
incorrect
*
not completed
.
An air-filled bubble, of diameter 1.6 cm, is formed by a thin film of soapy water whose surface tension is 0.050 J.m
-2
. By how much will the air pressure inside the bubble exceed that of the surrounding air?
0.100 mbar
correct
incorrect
0.125 mbar
correct
incorrect
0.175 mbar
correct
incorrect
0.225 mbar
correct
incorrect
0.250 mbar
correct
incorrect
*
not completed
.
The saturated vapour pressure above a curved liquid surface should exceed that of the same liquid's flat surface by a factor that…
Decreases logarithmically with increasing curvature
correct
incorrect
Increases logarithmically with increasing temperature
correct
incorrect
Decreases linearly with increasing temperature
correct
incorrect
Increases linearly with increasing curvature
correct
incorrect
Increases exponentially with increasing reciprocal temperature
correct
incorrect
*
not completed
.
In the low-concentration regime, the specific surface energy of a certain liquid varies linearly with the bulk concentration of a given surfactant at some fixed temperature and pressure. Which of these statements may be inferred from the Gibbs isotherm?
The surface excess of the surfactant varies linearly with its bulk concentration
correct
incorrect
The surface excess of the surfactant varies quadratically with its bulk concentration
correct
incorrect
The surface excess of the surfactant varies logarithmically with its bulk concentration
correct
incorrect
The surface excess of the surfactant is precisely zero
correct
incorrect
The surface excess of the surfactant is independent of its bulk concentration
correct
incorrect
*
not completed
.
The relative coverage of a certain species on some given solid surface is measured to be 0.50 at a pressure of 7.5 × 10
-8
mbar. Assuming Langmuirian behaviour, what relative coverage would be expected at a pressure of 2.5 × 10
-7
mbar?
0.57
correct
incorrect
0.67
correct
incorrect
0.77
correct
incorrect
0.87
correct
incorrect
0.97
correct
incorrect
*
not completed
.
The relative coverage of a certain species on some given solid surface is measured to be 0.33 at a pressure of 6.66 × 10
-8
mbar, rising to 0.50 at a pressure of 1.25 × 10
-7
mbar. Assuming that adsorption occurs via a precursor state, which of the following would be the best estimate for the Kisliuk parameter?
0.25
correct
incorrect
0.33
correct
incorrect
0.50
correct
incorrect
0.67
correct
incorrect
0.75
correct
incorrect
*
not completed
.
Adsorption of a certain species on some given solid surface is found to conform closely to the Brunauer-Emmett-Teller isotherm, and it is believed that a relative coverage of unity is achieved when the gas-phase pressure of that species is precisely one quarter of its saturated vapour pressure. What must be the value of the parameter
c
in the expression for the isotherm?
6
correct
incorrect
7
correct
incorrect
8
correct
incorrect
9
correct
incorrect
10
correct
incorrect
*
not completed
.
The Clausius-Clapeyron equation permits estimation of adsorption heat given which type of data?
Temperature/pressure pairs consistent with a single fixed surface coverage
correct
incorrect
Pressure/coverage pairs consistent with a single fixed temperature
correct
incorrect
Surface stress/strain pairs consistent with a single fixed pressure
correct
incorrect
Coverage/temperature pairs consistent with a single fixed pressure
correct
incorrect
Surface stress/strain pairs with a single fixed coverage
correct
incorrect
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