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The emissivity coefficient of an oxidized iron surface is 0.612 and the same value can be...
The emissivity coefficient of an oxidized iron surface is 0.612 and the same value can be accepted for the absorption coefficient of radiation received from the environment. Calculate the heat lost per square meter of the surface that is at 80 ° C, located vertically in a 20 ° C environment.
Solutions
Amanda K answered 11 months agoRelated Solutions
During the corrosion of iron, iron is oxidized (Fe → Fe2+ + 2e −) and molecular...
During the corrosion of iron, iron is oxidized (Fe → Fe2+ + 2e
−) and molecular oxygen is reduced (O2 + 2H2O + 4e −→ 4HO−). The E
◦ for the reduction of Fe2+ to Fe is −0.44 V, the E ◦ for the
reduction of O2 is 0.40 V, and the E ◦ for the reduction of Au3+ to
Au (Au3+ + 3e −→ Au) is 1.50 V. What would E ◦ cell be for the
oxidation of gold...
Iron(II) can be oxidized by an acidic K2Cr2O7 solution according to the net ionic equation. Cr2O72-...
Iron(II) can be oxidized by an acidic K2Cr2O7 solution according
to the net ionic equation.
Cr2O72- + 6 Fe2+ + 14 H+ 2 Cr3+ + 6 Fe3+ + 7 H2O
If it takes 30.0 mL of 0.0250 M K2Cr2O7 to titrate 20.0 mL of a
solution containing Fe2+, what is the molar concentration of
Fe2+?
I have seen this question answered before, and I understand the
mechanics of taking the ratio of CrO7 ion to Fe ion (1:6) and using...
A flat plate solar collector with no cover plate has a selective absorber surface of emissivity...
A flat plate solar collector with no cover plate has a selective
absorber surface of emissivity 0.1 and solar absorptivity 0.95. At
a given time of day the absorber surface temperature ?? is 120℃
when the solar radiation is 750 W/m^2, the effective sky
temperature is -10℃, and the ambient temperature ?∞ is 30℃.
Assuming that the heat transfer convection coefficient for the calm
day conditions, estimated h= 0.22 (?? −?∞) 1 3 W/m^2 K.
(a) Calculate the useful heat...
In the reaction of copper(II) sulfate with iron, what species is oxidized? CuSO4 (aq) +...
In the reaction of copper(II) sulfate with iron, what species is
oxidized?
CuSO4 (aq) + Fe (s) →→ Cu (s) + FeSO4
(aq)
a. Cu2+ in CuSO4
b. Fe (s)
c. Cu (s)
d. Fe2+ in FeSO4
In the reaction of copper(II) sulfate with iron, what species is
the oxidizing agent?
CuSO4 (aq) + Fe (s) →→ Cu (s) + FeSO4
(aq)
a. CuSO4
b. Fe (s)
c. Cu (s)
d. FeSO4
Suppose that some of the iron atoms in the ceramic FeO are oxidized from Fe 2+...
Suppose that some of the iron atoms in the ceramic FeO
are oxidized from Fe 2+ to Fe 3+.
a) Would the net charge of the crystal be positive or
negative?
b) Explain why each of the following defects would or
would not be reasonable to regain charge balance:
O 2- vacancies
O 2- interstitials
Fe 2+ vacancies
Fe 2+ interstitials
c) what ratio of these defects above to Fe 3+ is
needed for charge neutrality ?
d) Ionic materials...
Suppose that some of the iron atoms in the ceramic FeO are oxidized from Fe 2+...
Suppose that some of the iron atoms in the ceramic FeO
are oxidized from Fe 2+ to Fe 3+.
a) Would the net charge of the crystal be positive or
negative?
b) Explain why each of the following defects would or
would not be reasonable to regain charge balance:
O 2- vacancies
O 2- interstitials
Fe 2+ vacancies
Fe 2+ interstitials
c) what ratio of these defects above to Fe 3+ is
needed for charge neutrality ?
d) Ionic materials...
22) the diffusion coefficient of carbon FCC iron is lower than BCC iron because a) the...
22) the diffusion coefficient of carbon FCC iron is lower than
BCC iron because
a) the temperature is higher for FCC
b) FCC has a higher packing factor
c) FCC is more cubic
d) Carbon is substitional in FCC
Explain why the same surface roughness values do not necessarily represent the same type of surface
Explain why the same surface roughness values do not
necessarily represent the same type of surface. Please give some
examples. Hint: surfaces that have the same Ra values, may be are
very different geometrically and have different tribological
performance. Give examples.
4. When does a surface have its total hemispherical emissivity equal to its total hemispherical absorptivity...
4. When does a surface have its total hemispherical emissivity
equal to its total hemispherical absorptivity for radiation coming
from a blackbody?
A. When the surface temperature is equal to the temperature of
the source of radiation
B. When the surface temperature is greater than the temperature
of the source of radiation
C. When the surface temperature is less than the temperature of
the source of radiation
D. When the surface temperature and the temperature of the
source of radiation...
which one is more easily oxidized. Copper or hydrogen Iron or Hydrogen Magnesium or Hydrogen Zinc...
which one is more easily oxidized.
Copper or hydrogen
Iron or Hydrogen
Magnesium or Hydrogen
Zinc or hydrogen
list the element in the most easily oxidized to the least easily
oxidized.
Calcium, cesium, copper, hydrogen, iron, magnesium ,sodium and
zinc
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