Question 1

Write a balanced chemical equation illustrating roasting.

Accepted Answer

2ZnS + 3O₂

Question 2

Aluminum hydroxide, Al(OH)3, is

Accepted Answer

A) an acid. 
B) an amphoteric hydroxide. 
C) a base. 
D) an explosive hydroxide. 
E) used to make amalgams. 
A) an acid. 
B) an amphoteric hydroxide. 
C) a base. 
D) an explosive hydroxide. 
E) used to make amalgams.

Question 3

Alloys of iron that contain 1.0-1.5% carbon and some manganese, phosphorus, silicon, and sulfur are called

Accepted Answer

A) steel. 
B) cast iron. 
C) coke. 
D) pig iron. 
E) hematite. 
A) steel. 
B) cast iron. 
C) coke. 
D) pig iron. 
E) hematite.

Question 4

According to the band theory, a band is

Accepted Answer

A) an elastic force that holds electrons close to atoms in an insulator. 
B) the energy gap associated with semiconductors. 
C) a large number of molecular orbitals that are close together in energy. 
D) a large number of atoms in a crystal. 
A) an elastic force that holds electrons close to atoms in an insulator. 
B) the energy gap associated with semiconductors. 
C) a large number of molecular orbitals that are close together in energy. 
D) a large number of atoms in a crystal.

Question 5

Beryllium, the first element in Group 2A, is the most metallic element in the group.

Accepted Answer

A) True 
 B)False

Question 6

Which two compounds are produced by the Solvay process?

Accepted Answer

A) CaCO3 and CaO 
B) CaCO3 and Na2CO3 
C) NaHCO3 and NaCl 
D) NH3 and NH4Cl 
E) NaHCO3 and Na2CO3 
A) CaCO3 and CaO 
B) CaCO3 and Na2CO3 
C) NaHCO3 and NaCl 
D) NH3 and NH4Cl 
E) NaHCO3 and Na2CO3

Question 7

Potassium superoxide, KO2(s), is used in the breathing systems of biohazard suits.Write separate chemical equations showing how KO2(s)reacts with moisture and carbon dioxide in exhaled air to generate oxygen gas.

Accepted Answer

2KO₂(s)+ 2H_2</

Question 8

Write a balanced chemical equation illustrating chemical reduction.

Accepted Answer

Cr₂O₃ +

Question 9

Write the chemical formula of halite.

Accepted Answer

The answer of Write the chemical formula of halite....

Question 10

The following reaction is used to produce chromium metal at high temperature.
Cr2O3(s)+ 2Al(s) $\to$  2Cr(l)+ Al2O3(s)
Which element is oxidized and which is reduced?

Accepted Answer

chromium is reduced

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

Mercury, magnesium, and zinc have low enough boiling points that they can be purified by distillation.

Accepted Answer

A) True 
 B)False

Question 13

In the production of potassium metal, the source of electrons in the reduction of K+ ions is

Accepted Answer

A) H2(g) 
B) Na(g) 
C) CO(g) 
D) CaO(s) 
E) electrolysis 
A) H2(g) 
B) Na(g) 
C) CO(g) 
D) CaO(s) 
E) electrolysis

Question 14

Write the chemical formula of magnetite.

Accepted Answer

Fe<sub>3</sub>O<sub>

Question 15

Which choice gives two raw materials used in the Solvay process?

Accepted Answer

A) NaHCO3 and NaCl 
B) CaCO3 and Na2CO3 
C) NaCl and NaCO3 
D) NH3 and NaCl 
E) Na2CO3 and NH4Cl 
A) NaHCO3 and NaCl 
B) CaCO3 and Na2CO3 
C) NaCl and NaCO3 
D) NH3 and NaCl 
E) Na2CO3 and NH4Cl

Question 16

Which one of these metals would normally be obtained by chemical reduction?

Accepted Answer

A) aluminum 
B) calcium 
C) lithium 
D) sodium 
E) vanadium 
A) aluminum 
B) calcium 
C) lithium 
D) sodium 
E) vanadium

Question 17

The following reaction is used to produce titanium metal at high temperature.
TiCl4(g)+ 2Mg(l)$\to$ Ti(s)+ 2MgCl2(l)
Which element is oxidized and which is reduced?

Accepted Answer

titanium is reduced

Question 18

Metallic sodium is obtained commercially from molten sodium chloride by

Accepted Answer

A) chemical reduction with magnesium. 
B) flotation. 
C) electrolysis. 
D) zone refining. 
E) roasting. 
A) chemical reduction with magnesium. 
B) flotation. 
C) electrolysis. 
D) zone refining. 
E) roasting.

Exam 20: Metallurgy and the Chemistry of Metals

Write a balanced chemical equation illustrating roasting.

Aluminum hydroxide, Al(OH)3, is

Alloys of iron that contain 1.0-1.5% carbon and some manganese, phosphorus, silicon, and sulfur are called

According to the band theory, a band is

Beryllium, the first element in Group 2A, is the most metallic element in the group.

Which two compounds are produced by the Solvay process?

Potassium superoxide, KO2(s), is used in the breathing systems of biohazard suits.Write separate chemical equations showing how KO2(s)reacts with moisture and carbon dioxide in exhaled air to generate oxygen gas.

Write a balanced chemical equation illustrating chemical reduction.

Write the chemical formula of halite.

The following reaction is used to produce chromium metal at high temperature. Cr2O3(s)+ 2Al(s) →\to→ 2Cr(l)+ Al2O3(s) Which element is oxidized and which is reduced?

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

Mercury, magnesium, and zinc have low enough boiling points that they can be purified by distillation.

In the production of potassium metal, the source of electrons in the reduction of K+ ions is

Write the chemical formula of magnetite.

Which choice gives two raw materials used in the Solvay process?

Which one of these metals would normally be obtained by chemical reduction?

The following reaction is used to produce titanium metal at high temperature. TiCl4(g)+ 2Mg(l) →\to→ Ti(s)+ 2MgCl2(l) Which element is oxidized and which is reduced?

Metallic sodium is obtained commercially from molten sodium chloride by

Chemistry: The Study of Change

Atoms, Molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solution

Gases

Thermo-Chemistry

Quantum Theory and the Electronic Structure of Atoms

Periodic Relationships Among the Elements

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Chemistry in the Atmosphere

Entropy, Free Energy, and Equilibrium

Electrochemistry

Nonmetallic Elements and Their Compounds

Transition Metal Chemistry and Coordination Compounds

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Filters

Aluminum hydroxide, Al(OH)₃, is

Potassium superoxide, KO₂(s), is used in the breathing systems of biohazard suits.Write separate chemical equations showing how KO₂(s)reacts with moisture and carbon dioxide in exhaled air to generate oxygen gas.

The following reaction is used to produce chromium metal at high temperature. Cr₂O₃(s)+ 2Al(s) $\to$ 2Cr(l)+ Al₂O₃(s) Which element is oxidized and which is reduced?

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

In the production of potassium metal, the source of electrons in the reduction of K⁺ ions is

The following reaction is used to produce titanium metal at high temperature. TiCl₄(g)+ 2Mg(l) $\to$ Ti(s)+ 2MgCl₂(l) Which element is oxidized and which is reduced?