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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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What statement is most inconsistent with the chemistry of transition elements?
What statement is most inconsistent with the chemistry of transition elements?
What statement is most inconsistent with the chemistry of transition elements?
A) Bromide, chloride and iodide stabilize the higher oxidation states of the transition elements.
B) Early transition metal ions with the metal in its lowest oxi
Whelan   357   1 Reply
8 years ago
What is the strongest oxidizing agent of the following set: VCl2, CrCl3, KMnO4, KReO4?
What is the strongest oxidizing agent of the following set: VCl2, CrCl3, KMnO4, KReO4?
What is the strongest oxidizing agent of the following set: VCl2, CrCl3, KMnO4, KReO4?
A) VCl2
B) CrCl3
C) KMnO4
D) KReO4
Whelan   219   1 Reply
8 years ago
Which of the following ions has the greater effective nuclear charge?
Which of the following ions has the greater effective nuclear charge?
Which of the following ions has the greater effective nuclear charge?
A) V3+
B) Cr3+
C) Fe3+
D) Co3+
Whelan   265   1 Reply
8 years ago
Which of the following ions should be the strongest reducing agent?
Which of the following ions should be the strongest reducing agent?
Which of the following ions should be the strongest reducing agent?
A) V3+
B) Cr3+
C) Fe3+
D) Co3+
Whelan   124   1 Reply
8 years ago
What chemical equation represents the best method for obtaining pure chromium?
What chemical equation represents the best method for obtaining pure chromium?
What chemical equation represents the best method for obtaining pure chromium?
A) FeCr2O4(s) + 4 C(s) + heat → Fe(s) + 2 Cr(s) + 4 CO(g)
B) Cr2O3(s) + 2 Al(s) + heat → 2 Cr(s) + Al2O3(s)
C) Cr2O3(s) + 2 Fe(s) + heat → Fe2O3(s) + 2 Cr(s
Whelan   130   1 Reply
8 years ago
Which one of the following is a metallic conductor at room temperature but a superconductor at 18 K?
Which one of the following is a metallic conductor at room temperature but a superconductor at 18 K?
Which one of the following is a metallic conductor at room temperature but a superconductor at 18 K?
A) diamond
B) graphite
C) fullerene
D) potassium fulleride
Whelan   162   1 Reply
8 years ago
A particular superconductor has eight copper atoms on corners and eight copper atoms on edges of its
A particular superconductor has eight copper atoms on corners and eight copper atoms on edges of its
A particular superconductor has eight copper atoms on corners and eight copper atoms on edges of its unit cell. How many copper atoms are attributed to a single unit cell of this superconductor?
A) 1
B) 3
C) 5
D) 16
Whelan   383   1 Reply
8 years ago
What is the average oxidation state of Cu in HgCa2Ba2Cu3O8-x if Hg is in the +2 oxidation state?
What is the average oxidation state of Cu in HgCa2Ba2Cu3O8-x if Hg is in the +2 oxidation state?
What is the average oxidation state of Cu in HgCa2Ba2Cu3O8-x if Hg is in the +2 oxidation state?
A) +1
B) +2
C) +2 - 2x/3
D) +2 + 2x/3
Whelan   395   1 Reply
8 years ago
Who discovered the phenomenon of superconductivity in 1911?
Who discovered the phenomenon of superconductivity in 1911?
Who discovered the phenomenon of superconductivity in 1911?
A) J. G. Bednorz
B) R. B. Fuller
C) K. A. M ller
D) H. K. Onnes
Whelan   130   1 Reply
8 years ago
Below the superconducting transition temperature Tc, superconductors
Below the superconducting transition temperature Tc, superconductors
Below the superconducting transition temperature Tc, superconductors
A) become perfect conductors.
B) become perfect magnets.
C) become perfect resistors.
D) fail to work.
Whelan   151   1 Reply
8 years ago
What is the Meissner effect associated with superconductors? It is
What is the Meissner effect associated with superconductors? It is
What is the Meissner effect associated with superconductors? It is
A) when the temperature above which the superconductor fails to work.
B) when the temperature at which the superconductors become perfect insulators.
C) when the net m
Whelan   121   1 Reply
8 years ago
What structural features appear necessary for superconductivity in the 1-2-3 YBa2Cu3O7 superconducto
What structural features appear necessary for superconductivity in the 1-2-3 YBa2Cu3O7 superconducto
What structural features appear necessary for superconductivity in the 1-2-3 YBa2Cu3O7 superconductor?
A) high metallic character
B) infinite extended layers of Cu and O atoms and a fractional oxidation state for Cu
C) presence of an i
Whelan   167   1 Reply
8 years ago
Which has been found to be a three dimensional superconductor that conducts equally in all direction
Which has been found to be a three dimensional superconductor that conducts equally in all direction
Which has been found to be a three dimensional superconductor that conducts equally in all directions?
A) C (diamond)
B) C (graphite)
C) K3C60
D) YBa2Cu3O7
Whelan   148   1 Reply
8 years ago
Why are ceramics superior to metals as structural materials?
Why are ceramics superior to metals as structural materials?
Why are ceramics superior to metals as structural materials?
A) Ceramics are easier to fabricate into shapes than metals.
B) Ceramics are more malleable than metals.
C) Ceramics are more resistant to wear and corrosion than metals.
Whelan   186   1 Reply
8 years ago
Which process is used in the fabrication of ceramics?
Which process is used in the fabrication of ceramics?
Which process is used in the fabrication of ceramics?
A) electrolysis
B) reduction
C) roasting
D) sintering
Whelan   131   1 Reply
8 years ago
Sintering is (Multiple Choice Question)
Sintering is (Multiple Choice Question)
Sintering is
A) a filtration process through a molecular sieve.
B) the process of heating particles of a powder below the melting point so that they fuse together.
C) the process of rapid cooling of a material to yield a superconductin
Whelan   240   1 Reply
8 years ago
Why are ceramics so much more brittle than metals?
Why are ceramics so much more brittle than metals?
Why are ceramics so much more brittle than metals?
A) The bonding in ceramics has a very high degree of ionic bonding character.
B) The bonding in ceramics has a very high degree of pi bonding character.
C) The bonding in ceramics is h
Whelan   192   1 Reply
8 years ago
What is the name of the oxide ceramic BeO?
What is the name of the oxide ceramic BeO?
What is the name of the oxide ceramic BeO?
A) beryllia
B) beryllic
C) beryllium ceramic
D) beryllium oxide
Whelan   212   1 Reply
8 years ago
What is the sol-gel process?
What is the sol-gel process?
What is the sol-gel process?
A) a series of chemical steps that involves the isolation of CuS and then roasting with oxygen
B) a series of chemical steps that involves the isolation of SO3 and then treatment with H2SO4
C) a series of c
Whelan   186   1 Reply
8 years ago
What is a cermet? (Multiple Choice)
What is a cermet? (Multiple Choice)
What is a cermet?
A) boron nitride/epoxy
B) ceramic-metal composite
C) ceramic-polymer composite
D) silicon carbide/graphite
Whelan   234   1 Reply
8 years ago
Silicon nitride/zirconia is a example of a
Silicon nitride/zirconia is a example of a
Silicon nitride/zirconia is a example of a
A) ceramic-ceramic composite.
B) ceramic-metal composite.
C) ceramic-polymer composite.
D) superconductor.
Whelan   229   1 Reply
8 years ago
Relative to a bulk sample of gold, nanoparticles of gold have
Relative to a bulk sample of gold, nanoparticles of gold have
Relative to a bulk sample of gold, nanoparticles of gold have
A) greater reactivity and higher melting point.
B) greater reactivity and lower melting point.
C) lower reactivity and higher melting point.
D) lower reactivity and low
Whelan   194   1 Reply
8 years ago
What are the most abundant mineral in the earth's crust?
What are the most abundant mineral in the earth's crust?
What are the most abundant mineral in the earth's crust?
A) silicates
B) iodides
C) sulfates
D) oxides
Whelan   150   1 Reply
8 years ago
What minerals are important commercial sources of metals?
What minerals are important commercial sources of metals?
What minerals are important commercial sources of metals?
A) silicates
B) chlorides
C) nitrates
D) oxides
Whelan   287   1 Reply
8 years ago
What is a principal commercial ore for the element aluminum?
What is a principal commercial ore for the element aluminum?
What is a principal commercial ore for the element aluminum?
A) bauxite
B) chalcopyrite
C) galena
D) rutile
Whelan   139   1 Reply
8 years ago
What is a principal commercial ore for the element iron?
What is a principal commercial ore for the element iron?
What is a principal commercial ore for the element iron?
A) bauxite
B) pyrolusite
C) ilmenite
D) hematite
Whelan   132   1 Reply
8 years ago
What is the most important copper containing ore?
What is the most important copper containing ore?
What is the most important copper containing ore?
A) bauxite
B) chalcopyrite
C) pyrolusite
D) ilmenite
Whelan   138   1 Reply
8 years ago
What metal is isolated from the ore galena?
What metal is isolated from the ore galena?
What metal is isolated from the ore galena?
A) lead
B) iron
C) zinc
D) silver
Whelan   129   1 Reply
8 years ago
What metal is isolated from the ore sphalerite?
What metal is isolated from the ore sphalerite?
What metal is isolated from the ore sphalerite?
A) chromium
B) iron
C) silver
D) zinc
Whelan   133   1 Reply
8 years ago
What metal is isolated from the ore rutile and what is the chemical formula of rutile?
What metal is isolated from the ore rutile and what is the chemical formula of rutile?
What metal is isolated from the ore rutile and what is the chemical formula of rutile?
A) aluminum, Al2O3 ∙ xH2O
B) cassiterite, SnO2
C) cinnabar, HgS
D) titanium, TiO2
Whelan   170   1 Reply
8 years ago
Which of the following metals occurs in nature principally as oxide ores?
Which of the following metals occurs in nature principally as oxide ores?
Which of the following metals occurs in nature principally as oxide ores?
A) Li
B) Cu
C) Cr
D) Ru
Whelan   154   1 Reply
8 years ago
Which substance is commonly found in nature in an uncombined form?
Which substance is commonly found in nature in an uncombined form?
Which substance is commonly found in nature in an uncombined form?
A) Fe
B) Zn
C) Au
D) Li
Whelan   222   1 Reply
8 years ago
Which metal is not found in nature in uncombined form?
Which metal is not found in nature in uncombined form?
Which metal is not found in nature in uncombined form?
A) Mn
B) Au
C) Os
D) Ir
Whelan   224   1 Reply
8 years ago
Which of the following elements is most likely to occur as a metal sulfide ore?
Which of the following elements is most likely to occur as a metal sulfide ore?
Which of the following elements is most likely to occur as a metal sulfide ore?
A) Al
B) Hg
C) Li
D) Mn
Whelan   175   1 Reply
8 years ago
Which of the following elements is most likely to naturally occur as a carbonate?
Which of the following elements is most likely to naturally occur as a carbonate?
Which of the following elements is most likely to naturally occur as a carbonate?
A) Ba
B) Cu
C) Au
D) Pd
Whelan   182   1 Reply
8 years ago
The chemical process of roasting is commonly used to facilitate the reduction of which metal ores?
The chemical process of roasting is commonly used to facilitate the reduction of which metal ores?
The chemical process of roasting is commonly used to facilitate the reduction of which metal ores?
A) Ag, Cu, and Hg
B) Ag, Mg, and Na
C) Hg and Pt
D) Ag, Mn, and V
Whelan   149   1 Reply
8 years ago
Which of the following metals is commonly obtained by electrolysis?
Which of the following metals is commonly obtained by electrolysis?
Which of the following metals is commonly obtained by electrolysis?
A) Pt
B) Ag
C) Ni
D) Na
Whelan   151   1 Reply
8 years ago
Which element is likely to be a principal impurity in zinc ore?
Which element is likely to be a principal impurity in zinc ore?
Which element is likely to be a principal impurity in zinc ore?
A) lead
B) zinc
C) silver
D) cadmium
Whelan   152   1 Reply
8 years ago
How many kilograms of copper sulfide must be reduced to produce 3.20 × 1010 kg of Cu? The reduction
How many kilograms of copper sulfide must be reduced to produce 3.20 × 1010 kg of Cu? The reduction
How many kilograms of copper sulfide must be reduced to produce 3.20 × 1010 kg of Cu?  The reduction of copper proceeds via the following reaction.

Cu2S (l) + O2 (g) 2Cu (l) + SO2 (g)
A) 3.20 × 1013 kg
B) 4.0 × 1012 kg
Whelan   182   1 Reply
8 years ago
Steel is a mixture composed primarily of
Steel is a mixture composed primarily of
Steel is a mixture composed primarily of
A) iron and chromium.
B) iron and zinc.
C) iron and lead.
D) iron and gold.
Whelan   303   1 Reply
8 years ago
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