Question 1

Of the following elements,which has a melting point slightly above room temperature?

Accepted Answer

A) B 
B) Ga 
C) In 
D) Tl 
A) B 
B) Ga 
C) In 
D) Tl

Question 2

What is the most metallic element of group 5A?

Accepted Answer

A) P 
B) As 
C) Sb 
D) Bi 
A) P 
B) As 
C) Sb 
D) Bi

Question 3

The alkali metals K,Rb,and Cs 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 4

In the reaction below,________ is the oxidizing agent and ________ is the reducing agent.
N2H4(l)+ N2O4(l)→ 3 N2(g)+ 4 H2O(g)

Accepted Answer

Question 5

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

Accepted Answer

A) CH3NH2 (Kb = 3.7 × 10-4) 
B) NH2OH (Kb = 9.1 × 10-9) 
C) NH3 (Kb = 1.8 × 10-5) 
D) N2H4 (Kb = 8.0 × 10-7) 
A) CH3NH2 (Kb = 3.7 × 10-4) 
B) NH2OH (Kb = 9.1 × 10-9) 
C) NH3 (Kb = 1.8 × 10-5) 
D) N2H4 (Kb = 8.0 × 10-7)

Question 6

Which one of the following compounds exhibits the strongest hydrogen bonding between its molecules?

Accepted Answer

A) HF 
B) HBr 
C) H2O 
D) Ar 
A) HF 
B) HBr 
C) H2O 
D) Ar

Question 7

What is the oxidation number of oxygen in KO2?

Accepted Answer

A) 0 
B) -1/2 
C) -1 
D) -2 
A) 0 
B) -1/2 
C) -1 
D) -2

Question 8

What statement is inconsistent about diamond?

Accepted Answer

A) A covalent network structure in which each C atom uses sp3 hybrid orbitals. 
B) A tetrahedral array of σ bonds with bond lengths of 154 pm. 
C) The hardest known substance with the highest melting point for an element. 
D) When an electrical potential is applied diamond becomes a valuable semiconductor. 
A) A covalent network structure in which each C atom uses sp3 hybrid orbitals. 
B) A tetrahedral array of σ bonds with bond lengths of 154 pm. 
C) The hardest known substance with the highest melting point for an element. 
D) When an electrical potential is applied diamond becomes a valuable semiconductor.

Question 9

-Which of these molecules is most likely to contain good π overlap of p orbitals,as shown in figure (a),rather than poor π overlap of p orbitals,as shown in figure (b)?

Accepted Answer

A) Cl2 
B) N2 
C) P4 
D) S8 
A) Cl2 
B) N2 
C) P4 
D) S8

Question 10

What is one method of making "laughing gas"?

Accepted Answer

A) NH4NO3(s)+ heat → N2O(g)+ 2 H2O(l) 
B) 3 Cu(s)+ 2 NO3-(aq)+ 8 H+(aq)→ 3 Cu2+(aq)+ 2 NO(g)+ 4 H2O(l) 
C) Cu(s)+ 2 NO3-(aq)+ 4 H+(aq)→ Cu2+(aq)+ 2 NO2(g)+ 2 H2O(l) 
D) 2 NO(g)+ O2(g)→ 2 NO2(g) 
A) NH4NO3(s)+ heat → N2O(g)+ 2 H2O(l) 
B) 3 Cu(s)+ 2 NO3-(aq)+ 8 H+(aq)→ 3 Cu2+(aq)+ 2 NO(g)+ 4 H2O(l) 
C) Cu(s)+ 2 NO3-(aq)+ 4 H+(aq)→ Cu2+(aq)+ 2 NO2(g)+ 2 H2O(l) 
D) 2 NO(g)+ O2(g)→ 2 NO2(g)

Question 11

The most stable allotrope of sulfur is S8.What are the approximate bond angles in S8?

Accepted Answer

Question 12

-From the above models of hydrides,indicate the one most representative of an interstitial metallic hydride.

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
A) I 
B) II 
C) III 
D) IV

Question 13

Which one of the following is the best electrical conductor?

Accepted Answer

A) C (diamond) 
B) C (graphite) 
C) P4 
D) S8 
A) C (diamond) 
B) C (graphite) 
C) P4 
D) S8

Question 14

What element was one of the "holes" in Mendeleev's periodic table?

Accepted Answer

A) Si 
B) Ge 
C) Sn 
D) Pb 
A) Si 
B) Ge 
C) Sn 
D) Pb

Question 15

-Which element indicated on the above periodic table forms a binary hydride with molecular structure (1)shown above?

Accepted Answer

A) element A 
B) element B 
C) element C 
D) element D 
A) element A 
B) element B 
C) element C 
D) element D

Question 16

In the mixed aluminum-boron hydride AlBH6,the number of hydrogen involved in 2c-2e bonds is ________,and the number of hydrogen involved in 3c-2e bonds is ________.

Accepted Answer

Question 17

-Which element shown on the periodic table above forms a covalent binary hydride with the formula MX3?

Accepted Answer

A) element A 
B) element B 
C) element C 
D) element D 
A) element A 
B) element B 
C) element C 
D) element D

Question 18

Predict the product(s)of the reaction of Br2(aq)with I-(aq).

Accepted Answer

A) No reaction 
B) IBr3-(aq) 
C) BrO3-(aq)and I2(aq) 
D) Br-(aq)and I2(aq) 
A) No reaction 
B) IBr3-(aq) 
C) BrO3-(aq)and I2(aq) 
D) Br-(aq)and I2(aq)

Question 19

The most acidic oxides of the group 5A elements are oxides of the element ________.

Accepted Answer

The answer of The most acidic oxides of the group...

Question 20

An incorrect statement about the alkaline earth metals is

Accepted Answer

A) Melting points generally decrease as one descends the group. 
B) Densities are less than those of the corresponding alkali elements of the same period. 
C) Ionic radii of the M2+ ion increases as one descends the group. 
D) The first ionization energy is less than that of the second ionization energy. 
A) Melting points generally decrease as one descends the group. 
B) Densities are less than those of the corresponding alkali elements of the same period. 
C) Ionic radii of the M2+ ion increases as one descends the group. 
D) The first ionization energy is less than that of the second ionization energy.

Exam 22: The Main-Group Elements

Of the following elements,which has a melting point slightly above room temperature?

What is the most metallic element of group 5A?

The alkali metals K,Rb,and Cs are commercially produced by

In the reaction below,________ is the oxidizing agent and ________ is the reducing agent. N2H4(l)+ N2O4(l)→ 3 N2(g)+ 4 H2O(g)

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

Which one of the following compounds exhibits the strongest hydrogen bonding between its molecules?

What is the oxidation number of oxygen in KO2?

What statement is inconsistent about diamond?

-Which of these molecules is most likely to contain good π overlap of p orbitals,as shown in figure (a),rather than poor π overlap of p orbitals,as shown in figure (b)?

What is one method of making "laughing gas"?

The most stable allotrope of sulfur is S8.What are the approximate bond angles in S8?

-From the above models of hydrides,indicate the one most representative of an interstitial metallic hydride.

Which one of the following is the best electrical conductor?

What element was one of the "holes" in Mendeleev's periodic table?

-Which element indicated on the above periodic table forms a binary hydride with molecular structure (1)shown above?

In the mixed aluminum-boron hydride AlBH6,the number of hydrogen involved in 2c-2e bonds is ________,and the number of hydrogen involved in 3c-2e bonds is ________.

-Which element shown on the periodic table above forms a covalent binary hydride with the formula MX3?

Predict the product(s)of the reaction of Br2(aq)with I-(aq).

The most acidic oxides of the group 5A elements are oxides of the element ________.

An incorrect statement about the alkaline earth metals is

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In the reaction below, is the oxidizing agent and is the reducing agent. N₂H₄(l)+ N₂O₄(l)→ 3 N₂(g)+ 4 H₂O(g)

What is the oxidation number of oxygen in KO₂?

The most stable allotrope of sulfur is S₈.What are the approximate bond angles in S₈?

In the mixed aluminum-boron hydride AlBH₆,the number of hydrogen involved in 2c-2e bonds is ,and the number of hydrogen involved in 3c-2e bonds is .

-Which element shown on the periodic table above forms a covalent binary hydride with the formula MX₃?

Predict the product(s)of the reaction of Br₂(aq)with I^-(aq).