Question 1

How would one classify a germanium crystal doped with arsenic?

Accepted Answer

A) conductor 
B) n-type semiconductor 
C) p-type semiconductor 
D) insulator 
A) conductor 
B) n-type semiconductor 
C) p-type semiconductor 
D) insulator B

Question 2

A diode has a negative bias when the p-type semiconductor is attached to the ________ (negative,positive)battery terminal,which ________ (inhibits,permits)electron flow.

Accepted Answer

negative,inhibits

Question 3

The following pictures show the electron population of the bands of MO energy levels for four different materials.  
-Which of these materials is an insulator?

Accepted Answer

A) material (1) 
B) material (2) 
C) material (3) 
D) material (4) 
A) material (1) 
B) material (2) 
C) material (3) 
D) material (4) D

Question 4

Which one of the following is an electrical insulator?

Accepted Answer

A) phosphorus 
B) platinum 
C) potassium 
D) ruthenium 
A) phosphorus 
B) platinum 
C) potassium 
D) ruthenium

Question 5

Which of the following steps is not always necessary in the extraction of a metal from its ore?

Accepted Answer

A) chemical treatment prior to reduction 
B) concentration of the ore 
C) reduction of the mineral to the free metal 
D) refining or purification of the metal 
A) chemical treatment prior to reduction 
B) concentration of the ore 
C) reduction of the mineral to the free metal 
D) refining or purification of the metal

Question 6

Why are ceramics superior to metals as structural materials?

Accepted Answer

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. 
D) Ceramics have greater impact resistance than metals. 
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. 
D) Ceramics have greater impact resistance than metals.

Question 7

In the reaction shown below calcium phosphate slag is formed from a reaction of calcium oxide with phosphoric anhydride.
6 CaO(s)+ P4O10(l)→ 2 Ca3(PO4)2(l)
CaO is a(n)________ oxide,and P4O10 is a(n)________ oxide.

Accepted Answer

A) acidic,acidic 
B) acidic,basic 
C) basic,acidic 
D) basic,basic 
A) acidic,acidic 
B) acidic,basic 
C) basic,acidic 
D) basic,basic

Question 8

Sintering is

Accepted Answer

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 superconducting mixture. 
D) the process of removing metals from ore by passing material through a magnetic field. 
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 superconducting mixture. 
D) the process of removing metals from ore by passing material through a magnetic field.

Question 9

The following pictures show the electron populations of the composite s - d bands for Y,Mo,Ag,and Cd.  
-Which picture corresponds to Mo?

Accepted Answer

A) picture (1) 
B) picture (2) 
C) picture (3) 
D) picture (4) 
A) picture (1) 
B) picture (2) 
C) picture (3) 
D) picture (4)

Question 10

One source of titanium is illmenite,FeTiO3.Other ores containing titanium are geikielite,MgTiO3,and pyrophanite,MnTiO3.The oxidation states of iron and titanium in illmentite are ________ and ________,respectively.

Accepted Answer

Question 11

Which of the following metals is not commonly obtained by electrolysis?

Accepted Answer

A) Al 
B) Li 
C) Na 
D) Zn 
A) Al 
B) Li 
C) Na 
D) Zn

Question 12

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).

Accepted Answer

A) 14,300 metric tons 
B) 20,000 metric tons 
C) 20,400 metric tons 
D) 30,000 metric tons 
A) 14,300 metric tons 
B) 20,000 metric tons 
C) 20,400 metric tons 
D) 30,000 metric tons

Question 13

What is the name of the oxide ceramic BeO?

Accepted Answer

A) beryllia 
B) beryllic 
C) beryllium ceramic 
D) beryllium oxide 
A) beryllia 
B) beryllic 
C) beryllium ceramic 
D) beryllium oxide

Question 14

Which substance is a good semiconductor?

Accepted Answer

A) diamond 
B) germanium 
C) gold 
D) phosphorus 
A) diamond 
B) germanium 
C) gold 
D) phosphorus

Question 15

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?

Accepted Answer

A) 1 
B) 3 
C) 5 
D) 16 
A) 1 
B) 3 
C) 5 
D) 16

Question 16

What substance has a rating of 10 on the Mohs hardness scale?

Accepted Answer

A) alumina 
B) aluminum 
C) diamond 
D) talc 
A) alumina 
B) aluminum 
C) diamond 
D) talc

Question 17

Which substance is commonly found in nature in an uncombined form?

Accepted Answer

A) aluminum 
B) iron 
C) platinum 
D) tin 
A) aluminum 
B) iron 
C) platinum 
D) tin

Question 18

Which combination of semiconductors can be employed to make a diode?

Accepted Answer

A) GaAs doped with Ge and GaP doped with Si 
B) GaAs doped with Se and GaP doped with Zn 
C) Si doped with B and Ge doped with Ga 
D) Si doped with P and Ge doped with As 
A) GaAs doped with Ge and GaP doped with Si 
B) GaAs doped with Se and GaP doped with Zn 
C) Si doped with B and Ge doped with Ga 
D) Si doped with P and Ge doped with As

Question 19

The following pictures show the electron population of the bands of MO energy levels for four different materials.  
-Which of these materials has an electrical conductivity that decreases with an increase in temperature?

Accepted Answer

A) material (1) 
B) material (2) 
C) material (3) 
D) material (4) 
A) material (1) 
B) material (2) 
C) material (3) 
D) material (4)

Question 20

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 ________.

Accepted Answer

The answer of A silicon carbide ceramic has a unit...

Exam 21: Metals and Solid-State Materials

How would one classify a germanium crystal doped with arsenic?

A diode has a negative bias when the p-type semiconductor is attached to the ________ (negative,positive)battery terminal,which ________ (inhibits,permits)electron flow.

The following pictures show the electron population of the bands of MO energy levels for four different materials. -Which of these materials is an insulator?

Which one of the following is an electrical insulator?

Which of the following steps is not always necessary in the extraction of a metal from its ore?

Why are ceramics superior to metals as structural materials?

In the reaction shown below calcium phosphate slag is formed from a reaction of calcium oxide with phosphoric anhydride. 6 CaO(s)+ P4O10(l)→ 2 Ca3(PO4)2(l) CaO is a(n)________ oxide,and P4O10 is a(n)________ oxide.

Sintering is

The following pictures show the electron populations of the composite s - d bands for Y,Mo,Ag,and Cd. -Which picture corresponds to Mo?

One source of titanium is illmenite,FeTiO3.Other ores containing titanium are geikielite,MgTiO3,and pyrophanite,MnTiO3.The oxidation states of iron and titanium in illmentite are ________ and ________,respectively.

Which of the following metals is not commonly obtained by electrolysis?

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).

What is the name of the oxide ceramic BeO?

Which substance is a good semiconductor?

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?

What substance has a rating of 10 on the Mohs hardness scale?

Which substance is commonly found in nature in an uncombined form?

Which combination of semiconductors can be employed to make a diode?

The following pictures show the electron population of the bands of MO energy levels for four different materials. -Which of these materials has an electrical conductivity that decreases with an increase in temperature?

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 ________.

Chemistry: Matter and Measurement

Atoms, molecules, and Ions

Formulas, equations, and Moles

Reactions in Aqueous Solutions

Periodicity and the Atomic Structure of Atoms

Ionic Bonds and Some Main-Group Chemistry

Covalent Bonds 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

Hydrogen, oxygen, and Water

The Main-Group Elements

Transition Elements and Coordination Chemistry

Nuclear Chemistry

Organic and Biological Chemistry

Filters

A diode has a negative bias when the p-type semiconductor is attached to the (negative,positive)battery terminal,which (inhibits,permits)electron flow.

In the reaction shown below calcium phosphate slag is formed from a reaction of calcium oxide with phosphoric anhydride. 6 CaO(s)+ P₄O₁₀(l)→ 2 Ca₃(PO₄)₂(l) CaO is a(n) oxide,and P₄O₁₀is a(n) oxide.

One source of titanium is illmenite,FeTiO₃.Other ores containing titanium are geikielite,MgTiO₃,and pyrophanite,MnTiO₃.The oxidation states of iron and titanium in illmentite are and ,respectively.

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).