Question 1

A 0.010 M solution of which of the following would have the highest pH?

Accepted Answer

A) CH3NH2 (Kb = 3.7 × 10-4) 
B) (CH3)2NH (Kb = 5.4 × 10-4) 
C) (CH3)3N (Kb = 1.8 × 10-5) 
D) NH3 (Kb = 6.5 × 10-5) 
A) CH3NH2 (Kb = 3.7 × 10-4) 
B) (CH3)2NH (Kb = 5.4 × 10-4) 
C) (CH3)3N (Kb = 1.8 × 10-5) 
D) NH3 (Kb = 6.5 × 10-5)

Question 2

Which of the following statements about helium is inconsistent with its chemistry?

Accepted Answer

A) A helium oxygen mixture is used as a deep-sea diving gas instead of compressed air. 
B) In its liquid form it is used as a cryogenic coolant for superconductors. 
C) It is one of the more reactive elements of its group. 
D) Its melting point is -272.2°C and its boiling point is -268.9°C. 
A) A helium oxygen mixture is used as a deep-sea diving gas instead of compressed air. 
B) In its liquid form it is used as a cryogenic coolant for superconductors. 
C) It is one of the more reactive elements of its group. 
D) Its melting point is -272.2°C and its boiling point is -268.9°C.

Question 3

Which of the following elements exhibits the most metallic character?

Accepted Answer

A) B 
B) C 
C) N 
D) O 
A) B 
B) C 
C) N 
D) O

Question 4

SiO2 can be classified as a(n)

Accepted Answer

A) amorphous solid. 
B) covalent network solid. 
C) ionic solid. 
D) molecular solid. 
A) amorphous solid. 
B) covalent network solid. 
C) ionic solid. 
D) molecular solid.

Question 5

Disproportionation is a reaction in which a reactant is both oxidized and reduced in the same reaction.In the disproportionation reaction below,the oxidation number of chlorine in Cl2,ClO-,and Cl- is ________,________,and ________,respectively.
Cl2(g)+ 2 OH-(aq)→ ClO-(aq)+ Cl-(aq)+ H2O(l)

Accepted Answer

Question 6

Which group 3A element has the highest electronegativity?

Accepted Answer

A) B 
B) Al 
C) Ga 
D) Si 
A) B 
B) Al 
C) Ga 
D) Si

Question 7

Which one of the following elements can form more than four chemical bonds with other elements?

Accepted Answer

A) N 
B) O 
C) F 
D) S 
A) N 
B) O 
C) F 
D) S

Question 8

Which elements of group 6A are oxidizing agents and which are reducing agents?

Accepted Answer

A) O and S are oxidizing agents while Se and Te are reducing agents. 
B) O and Se are oxidizing agents while S and Te are reducing agents. 
C) O and S are reducing agents while Se and Te are oxidizing agents. 
D) O and Se are reducing agents while S and Te are reducing agents. 
A) O and S are oxidizing agents while Se and Te are reducing agents. 
B) O and Se are oxidizing agents while S and Te are reducing agents. 
C) O and S are reducing agents while Se and Te are oxidizing agents. 
D) O and Se are reducing agents while S and Te are reducing agents.

Question 9

What is the range of oxidation states that are exhibited by P?

Accepted Answer

A) from -3 to 0 
B) from -2 to +2 
C) from -3 to +5 
D) from -1 to +5 
A) from -3 to 0 
B) from -2 to +2 
C) from -3 to +5 
D) from -1 to +5

Question 10

The B-H-B bond in B2H6 is a three-________,two-________ bond.

Accepted Answer

Question 11

Main-group elements are those elements in groups ________ through ________ of the periodic table.

Accepted Answer

The answer of Main-group elements are those elements in groups...

Question 12

What is the name for the group of elements indicated by the shaded portion of the periodic table?

Accepted Answer

A) alkali metals 
B) alkaline earth metals 
C) inner-transition metals 
D) transition metals 
A) alkali metals 
B) alkaline earth metals 
C) inner-transition metals 
D) transition metals

Question 13

Lithium reacts with oxygen to form an oxide with the formula ________.

Accepted Answer

The answer of Lithium reacts with oxygen to form an...

Question 14

What is the basic building block of all silicates?

Accepted Answer

A) Si2O64- 
B) Si 
C) SiO2  
D) SiO44- 
A) Si2O64- 
B) Si 
C) SiO2  
D) SiO44-

Question 15

In the following pictures representing binary hydrides AHS1U1B1xS1U1B0,lightly-shaded spheres represent H atoms or ions and darkly-shaded spheres represent atoms or ions of the other element,A.  
-The binary hydride shown in picture (1)is classified as

Accepted Answer

A) covalent. 
B) interstitial (metallic). 
C) ionic. 
D) None of these 
A) covalent. 
B) interstitial (metallic). 
C) ionic. 
D) None of these

Question 16

Binary oxides can be classified as acidic,amphoteric,or basic.MgO,Al2O3,and SO3 are classified as ________,________,and ________ oxides,respectively.

Accepted Answer

basic,amph

Question 17

White tin is the high temperature form of the metal.Given that the density of gray tin is 5.769 g/cm3 and that of white tin is 7.28 g/cm3 raising the pressure will favor the

Accepted Answer

A) more dense allotrope and lower the transition temperature of 13.2°C. 
B) more dense allotrope and raise the transition temperature of 13.2°C. 
C) less dense allotrope and lower the transition temperature of 13.2°C. 
D) less dense allotrope and raise the transition temperature of 13.2°C. 
A) more dense allotrope and lower the transition temperature of 13.2°C. 
B) more dense allotrope and raise the transition temperature of 13.2°C. 
C) less dense allotrope and lower the transition temperature of 13.2°C. 
D) less dense allotrope and raise the transition temperature of 13.2°C.

Question 18

When P4O10 is dissolved in water,the water will have a(n)________ pH due to the reaction ________.

Accepted Answer

acidic,P₄O₁₀(

Question 19

The alkali metals Li and Na are commercially produced by

Accepted Answer

A) chemical reduction of their molten salts. 
B) electrolysis of their molten salts. 
C) thermal decomposition of their molten metal halides. 
D) thermal decomposition of their molten metal oxides. 
A) chemical reduction of their molten salts. 
B) electrolysis of their molten salts. 
C) thermal decomposition of their molten metal halides. 
D) thermal decomposition of their molten metal oxides.

Question 20

The oxidation numbers of nitrogen in NH4NO3 are ________ and ________.

Accepted Answer

Exam 22: The Main-Group Elements

A 0.010 M solution of which of the following would have the highest pH?

Which of the following statements about helium is inconsistent with its chemistry?

Which of the following elements exhibits the most metallic character?

SiO2 can be classified as a(n)

Disproportionation is a reaction in which a reactant is both oxidized and reduced in the same reaction.In the disproportionation reaction below,the oxidation number of chlorine in Cl2,ClO-,and Cl- is ________,________,and ________,respectively. Cl2(g)+ 2 OH-(aq)→ ClO-(aq)+ Cl-(aq)+ H2O(l)

Which group 3A element has the highest electronegativity?

Which one of the following elements can form more than four chemical bonds with other elements?

Which elements of group 6A are oxidizing agents and which are reducing agents?

What is the range of oxidation states that are exhibited by P?

The B-H-B bond in B2H6 is a three-________,two-________ bond.

Main-group elements are those elements in groups ________ through ________ of the periodic table.

What is the name for the group of elements indicated by the shaded portion of the periodic table?

Lithium reacts with oxygen to form an oxide with the formula ________.

What is the basic building block of all silicates?

In the following pictures representing binary hydrides AHx,lightly-shaded spheres represent H atoms or ions and darkly-shaded spheres represent atoms or ions of the other element,A. -The binary hydride shown in picture (1)is classified as

Binary oxides can be classified as acidic,amphoteric,or basic.MgO,Al2O3,and SO3 are classified as ________,________,and ________ oxides,respectively.

White tin is the high temperature form of the metal.Given that the density of gray tin is 5.769 g/cm3 and that of white tin is 7.28 g/cm3 raising the pressure will favor the

When P4O10 is dissolved in water,the water will have a(n)________ pH due to the reaction ________.

The alkali metals Li and Na are commercially produced by

The oxidation numbers of nitrogen in NH4NO3 are ________ and ________.

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Filters

SiO₂ can be classified as a(n)

Disproportionation is a reaction in which a reactant is both oxidized and reduced in the same reaction.In the disproportionation reaction below,the oxidation number of chlorine in Cl₂,ClO^-,and Cl^- is ,,and ,respectively. Cl₂(g)+ 2 OH^-(aq)→ ClO^-(aq)+ Cl^-(aq)+ H₂O(l)

The B-H-B bond in B₂H₆ is a three-,two- bond.

Main-group elements are those elements in groups through of the periodic table.

In the following pictures representing binary hydrides AH_x,lightly-shaded spheres represent H atoms or ions and darkly-shaded spheres represent atoms or ions of the other element,A. -The binary hydride shown in picture (1)is classified as

Binary oxides can be classified as acidic,amphoteric,or basic.MgO,Al₂O₃,and SO₃ are classified as ,,and oxides,respectively.

White tin is the high temperature form of the metal.Given that the density of gray tin is 5.769 g/cm³ and that of white tin is 7.28 g/cm³ raising the pressure will favor the

When P₄O₁₀ is dissolved in water,the water will have a(n) pH due to the reaction .

The oxidation numbers of nitrogen in NH₄NO₃ are and .