Question 1

What effect does increasing temperature have on the conductivities of semiconductors?

Accepted Answer

A) Increases 
B) Decreases 
C) No change 
D) Cannot be predicted 
A) Increases 
B) Decreases 
C) No change 
D) Cannot be predicted A

Question 2

What is the chemical formula for talc?

Accepted Answer

A) NaNO3 
B) Mg3(PO4)2 
C) CaCO3 
D) Mg3(Si4O10)(OH)2 
E) Ca3(PO4)2 
A) NaNO3 
B) Mg3(PO4)2 
C) CaCO3 
D) Mg3(Si4O10)(OH)2 
E) Ca3(PO4)2 D

Question 3

Aluminum and magnesium are light metals which are used in many structural applications.

Accepted Answer

Although they are highly active metals (as their electrode potentials suggest),they can often be used without the use of paint or other applied finishes to protect them against corrosion.How is this possible? Both Al and Mg have strong,adherent,relatively insoluble oxides.These form naturally on the metal surface,in the presence of atmospheric oxygen,and serve to protect the underlying metal from further oxidation/corrosion.

Question 4

Which of these elements when doped into silicon would give an n-type semiconductor?

Accepted Answer

A) C 
B) Ga 
C) P 
D) Ge 
E) B 
A) C 
B) Ga 
C) P 
D) Ge 
E) B

Question 5

What is the science and technology of separating metals from their ores and of compounding alloys?

Accepted Answer

The answer of What is the science and technology of...

Question 6

Magnesium reacts with dilute hydrochloric acid according to which of these equations?

Accepted Answer

A) Mg + 2HCl → 2H+ + MgCl 
B) Mg + 2HCl → H2 + MgCl2 
C) Mg + 2HCl → Cl2 + MgH2 
D) Mg + 2HCl → Cl2 + Mg2+ + 2H+ 
A) Mg + 2HCl → 2H+ + MgCl 
B) Mg + 2HCl → H2 + MgCl2 
C) Mg + 2HCl → Cl2 + MgH2 
D) Mg + 2HCl → Cl2 + Mg2+ + 2H+

Question 7

What is the major component in limestone?

Accepted Answer

A) NaNO3 
B) KCl 
C) CaCl 
D) BaSO4 
E) CaCO3 
A) NaNO3 
B) KCl 
C) CaCl 
D) BaSO4 
E) CaCO3

Question 8

What is another name for iron carbide (Fe3C)?

Accepted Answer

Question 9

A metal crystal consisting of 1 × 1020 atoms has 0.5 × 1020 bonding orbitals and 0.5 × 1020 antibonding molecular orbitals.

Accepted Answer

A) True 
 B)False

Question 10

The Hall process refers to

Accepted Answer

A) the production of aluminum by electrolysis. 
B) the recovery of sulfur from underground deposits. 
C) the manufacture of sulfuric acid. 
D) the production of ammonia from nitrogen and hydrogen gases. 
E) the isolation of Al2O3 from bauxite. 
A) the production of aluminum by electrolysis. 
B) the recovery of sulfur from underground deposits. 
C) the manufacture of sulfuric acid. 
D) the production of ammonia from nitrogen and hydrogen gases. 
E) the isolation of Al2O3 from bauxite.

Question 11

Aluminum chloride reacts with manganese metal to form aluminum metal and manganese(II)
chloride.Which substance is oxidized in this reaction?

Accepted Answer

The answer of Aluminum chloride reacts with manganese metal to...

Question 12

Which diagram best corresponds to the energy level diagram of a semiconductor?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 13

What is the chemical formula for gypsum?

Accepted Answer

A) CaSO4• 2H2O 
B) CaF2 
C) MgSO4• 5H2O 
D) MgSO4• 7H2O 
E) CaCl2 
A) CaSO4• 2H2O 
B) CaF2 
C) MgSO4• 5H2O 
D) MgSO4• 7H2O 
E) CaCl2

Question 14

The Hall process involves the reduction of Al2O3 to aluminum by

Accepted Answer

A) carbon (coke). 
B) carbon monoxide. 
C) molecular hydrogen. 
D) sodium. 
E) electrolysis. 
A) carbon (coke). 
B) carbon monoxide. 
C) molecular hydrogen. 
D) sodium. 
E) electrolysis.

Question 15

What is the name for the elements in Group 2A of the periodic table?

Accepted Answer

Alkaline e

Question 16

What gas is produced at the anode in the Hall process for the electrolytic production of aluminum?

Accepted Answer

The answer of What gas is produced at the anode...

Question 17

The process that selectively extracts a metal from its ore,by dissolving it,is called

Accepted Answer

A) roasting. 
B) leaching. 
C) smelting. 
D) flotation. 
E) hydration. 
A) roasting. 
B) leaching. 
C) smelting. 
D) flotation. 
E) hydration.

Question 18

The _________ process is a fractional distillation process for the purification of nickel.

Accepted Answer

The answer of The _________ process is a fractional distillation...

Question 19

A(n)_______________ is an alloy of mercury with another metal.

Accepted Answer

The answer of A(n)_______________ is an alloy of mercury with...

Question 20

Bauxite (Al2O3 • 2H2O)ore is the commercial source of aluminum metal.

Accepted Answer

A) True 
 B)False

Exam 23: Metallurgy and the Chemistry of Metals

What effect does increasing temperature have on the conductivities of semiconductors?

What is the chemical formula for talc?

Aluminum and magnesium are light metals which are used in many structural applications.

Which of these elements when doped into silicon would give an n-type semiconductor?

What is the science and technology of separating metals from their ores and of compounding alloys?

Magnesium reacts with dilute hydrochloric acid according to which of these equations?

What is the major component in limestone?

What is another name for iron carbide (Fe3C)?

A metal crystal consisting of 1 × 1020 atoms has 0.5 × 1020 bonding orbitals and 0.5 × 1020 antibonding molecular orbitals.

The Hall process refers to

Aluminum chloride reacts with manganese metal to form aluminum metal and manganese(II) chloride.Which substance is oxidized in this reaction?

Which diagram best corresponds to the energy level diagram of a semiconductor?

What is the chemical formula for gypsum?

The Hall process involves the reduction of Al2O3 to aluminum by

What is the name for the elements in Group 2A of the periodic table?

What gas is produced at the anode in the Hall process for the electrolytic production of aluminum?

The process that selectively extracts a metal from its ore,by dissolving it,is called

The _________ process is a fractional distillation process for the purification of nickel.

A(n)_______________ is an alloy of mercury with another metal.

Bauxite (Al2O3 • 2H2O)ore is the commercial source of aluminum metal.

Chemistry: the Central Science

Atoms Molecules and Ions

Stoichiometry Ratios of Combination

Reactions in Aqueous Solutions

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Electron Configuration and the Periodic Table

Chemical Bonding I Basic Concepts

Chemical Bonding Ii Molecular Geometry and Bonding Theories

Gases

Intermolecular Forces and the Physical Properties of Liquids and Solids

Modern Materials

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy Free Energy and Equilibrium

Electrochemistry

Nuclear Chemistry

Environmental Chemistry

Coordination Chemistry

Nonmetallic Elements and Their Compounds

Organic Chemistry

Filters

What is another name for iron carbide (Fe₃C)?

A metal crystal consisting of 1 × 10²⁰ atoms has 0.5 × 10²⁰ bonding orbitals and 0.5 × 10²⁰ antibonding molecular orbitals.

The Hall process involves the reduction of Al₂O₃ to aluminum by

Bauxite (Al₂O₃ • 2H₂O)ore is the commercial source of aluminum metal.