Exam 21: Metals and Solid-State Materials

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In order for a photovoltaic cell to convert light to electricity,the band gap must be less than or equal to the energy of the light absorbed.If light of 955 nm is to be absorbed,the band gap of the photovoltaic cell must be less than or equal to ________ kJ/mol.

(Short Answer)

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Question 61

A nanoparticle that exhibits a yellow color is (larger/smaller)________ than a nanoparticle that exhibits a red color.

(Short Answer)

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Question 62

What is the chemical process most likely to be used to purify zirconium metal?

(Multiple Choice)

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Question 63

What structural features appear necessary for superconductivity in the 1-2-3 YBa₂Cu₃O₇ superconductor?

(Multiple Choice)

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Question 64

Which oxide ore will yield the greatest number of grams of pure metal per kilogram of ore?

(Multiple Choice)

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Question 65

What statement is inconsistent concerning the correlation of the chemical compositions of the most common ores with the locations of their metals in the periodic table?

(Multiple Choice)

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Question 66

Alumina-titanium is a composite material used in hip replacements.Composite materials can be classified as ceramic-ceramic,ceramic-metal,or ceramic-polymer.Alumina-titanium is classified as ________.

(Short Answer)

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Question 67

Which of the following metals occurs in nature principally as oxide ores?

(Multiple Choice)

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Question 68

Write a balanced chemical equation for obtaining iron metal by the reduction of hematite,Fe₂O₃,by hydrogen gas.

(Essay)

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Question 69

A silicon carbide ceramic has a unit cell with carbon atoms in a cubic closest packed arrangement with carbon atoms occupying one-half of the tetrahedral holes.The empirical formula of this ceramic is ________.

(Short Answer)

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Question 70

Which element has the largest energy band gap?

(Multiple Choice)

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Question 71

What element was found to be the first superconductor of electricity at 4.2 K in 1911?

(Multiple Choice)

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Question 72

What is the sol-gel process?

(Multiple Choice)

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Question 73

What metal is isolated from the ore galena?

(Multiple Choice)

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Question 74

To three significant figures,how many metric tons of iron ore are needed to produce 10,000 metric tons of iron per day in the blast furnace process? Assume that the iron ore is iron(III)oxide and that the ore is 70.0% pure.The reaction of interest is Fe₂O₃(s)+ 3 CO(g)→ 2 Fe(l)+ 3 CO₂(g).

(Multiple Choice)

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Question 75

Look at the location of elements A,B,C,and D in the following periodic table. -Which of these elements is likely to be found in nature as a sulfide?

(Multiple Choice)

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Question 76

Which one of the following is a p-type of semiconductor?

(Multiple Choice)

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Question 77

Which of the following is a semiconductor?

(Multiple Choice)

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Question 78

Steel is a mixture composed primarily of

(Multiple Choice)

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Question 79

Which one of the following is an electrical insulator?

(Multiple Choice)

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Question 80

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Exam 21: Metals and Solid-State Materials

In order for a photovoltaic cell to convert light to electricity,the band gap must be less than or equal to the energy of the light absorbed.If light of 955 nm is to be absorbed,the band gap of the photovoltaic cell must be less than or equal to ________ kJ/mol.

A nanoparticle that exhibits a yellow color is (larger/smaller)________ than a nanoparticle that exhibits a red color.

What is the chemical process most likely to be used to purify zirconium metal?

What structural features appear necessary for superconductivity in the 1-2-3 YBa2Cu3O7 superconductor?

Which oxide ore will yield the greatest number of grams of pure metal per kilogram of ore?

What statement is inconsistent concerning the correlation of the chemical compositions of the most common ores with the locations of their metals in the periodic table?

Alumina-titanium is a composite material used in hip replacements.Composite materials can be classified as ceramic-ceramic,ceramic-metal,or ceramic-polymer.Alumina-titanium is classified as ________.

Which of the following metals occurs in nature principally as oxide ores?

Write a balanced chemical equation for obtaining iron metal by the reduction of hematite,Fe2O3,by hydrogen gas.

A silicon carbide ceramic has a unit cell with carbon atoms in a cubic closest packed arrangement with carbon atoms occupying one-half of the tetrahedral holes.The empirical formula of this ceramic is ________.

Which element has the largest energy band gap?

What element was found to be the first superconductor of electricity at 4.2 K in 1911?

What is the sol-gel process?

What metal is isolated from the ore galena?

To three significant figures,how many metric tons of iron ore are needed to produce 10,000 metric tons of iron per day in the blast furnace process? Assume that the iron ore is iron(III)oxide and that the ore is 70.0% pure.The reaction of interest is Fe2O3(s)+ 3 CO(g)→ 2 Fe(l)+ 3 CO2(g).

Look at the location of elements A,B,C,and D in the following periodic table. -Which of these elements is likely to be found in nature as a sulfide?

Which one of the following is a p-type of semiconductor?

Which of the following is a semiconductor?

Steel is a mixture composed primarily of

Which one of the following is an electrical insulator?

Chemical Tools: Experimentation and Measurement

Atoms, molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solutions

Periodicity and the Electronic Structure of Atoms

Ionic Compounds: Periodic Trends and Bonding

Covalent Bonding and Electron-Dot Structures

Covalent Compounds: Bonding Theories and Molecular Structure

Thermochemistry: Chemical Energy

Gases: Their Properties and Behavior

Liquids, solids, and Phase Changes

Solutions and Their Properties

Chemical Kinetics

Chemical Equilibrium

Aqueous Equilibria: Acids and Bases

Applications of Aqueous Equilibria

Thermodynamics: Entropy, free Energy, and Equilibrium

Electrochemistry

Nuclear Chemistry

Transition Elements and Coordination Chemistry

The Main-Group Elements

Connections to Organic and Biological Chemistry

Filters

What structural features appear necessary for superconductivity in the 1-2-3 YBa₂Cu₃O₇ superconductor?

Write a balanced chemical equation for obtaining iron metal by the reduction of hematite,Fe₂O₃,by hydrogen gas.

To three significant figures,how many metric tons of iron ore are needed to produce 10,000 metric tons of iron per day in the blast furnace process? Assume that the iron ore is iron(III)oxide and that the ore is 70.0% pure.The reaction of interest is Fe₂O₃(s)+ 3 CO(g)→ 2 Fe(l)+ 3 CO₂(g).