Question 1

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 2

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 3

-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) O2 
C) P4 
D) S8 
A) Cl2 
B) O2 
C) P4 
D) S8

Question 4

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 5

What is the most acidic oxide of phosphorus?

Accepted Answer

A) PO2 
B) PO3 
C) P4O6 
D) P4O10 
A) PO2 
B) PO3 
C) P4O6 
D) P4O10

Question 6

The double-stranded silicate ion shown in the picture below combines with calcium and magnesium to form the mineral tremolite,which is a form of asbestos.What is the formula and charge of the repeating unit of the silicate ion?

Accepted Answer

A) SiO32- 
B) Si4O116- 
C) Si6O1710- 
D) Si12O3012- 
A) SiO32- 
B) Si4O116- 
C) Si6O1710- 
D) Si12O3012-

Question 7

Shown below are four oxoanions of sulfur.Small gray spheres represent hydrogen,unshaded spheres represent oxygen,and dotted spheres represent sulfur.  
-Which oxoanion is the weakest base?

Accepted Answer

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

Question 8

What statement about nitric acid is not true?

Accepted Answer

A) It is a strong oxidizing agent. 
B) It is one of the more common strong acids and is essentially 100% dissociated in water. 
C) It often has a yellow color due to the formation of NO2. 
D) Its anhydride is N2O3. 
A) It is a strong oxidizing agent. 
B) It is one of the more common strong acids and is essentially 100% dissociated in water. 
C) It often has a yellow color due to the formation of NO2. 
D) Its anhydride is N2O3.

Question 9

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 10

What is the formula and charge of the silicate anion represented by the picture below?

Accepted Answer

A) SiO22- 
B) SiO32- 
C) SiO44- 
D) Si4O128- 
A) SiO22- 
B) SiO32- 
C) SiO44- 
D) Si4O128-

Question 11

-Which element indicated on the above periodic table forms a binary hydride with molecular structure (4)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 12

Which one of the following is not a main group element?

Accepted Answer

A) Rb 
B) Sr 
C) U 
D) Pb 
A) Rb 
B) Sr 
C) U 
D) Pb

Question 13

What are appropriate methods for the generation of H2S?
Reaction 1: FeS(s)+ 2 H+(aq)→ H2S(g)+ Fe2+(aq)
Reaction 2: CH3C(CS)NH2(aq)+ H2O(l)+ heat → CH3(CO)NH2(aq)+ H2S(aq)
Reaction 3: 3 S(g)+ 2 H2O(g)→ SO2(g)+ 2 H2S(g)
Reaction 4: 2 SO2(g)+ 2 H2O(g)→ 2 H2S(g)+ 3 O2(g)

Accepted Answer

A) Reactions 1 and 2 
B) Reactions 1 and 3 
C) Reactions 2 and 3 
D) Reactions 2 and 4 
A) Reactions 1 and 2 
B) Reactions 1 and 3 
C) Reactions 2 and 3 
D) Reactions 2 and 4

Question 14

Which compound exhibits pi bonding?

Accepted Answer

A) F2 
B) N2 
C) P4 
D) S8 
A) F2 
B) N2 
C) P4 
D) S8

Question 15

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 16

The elements indicated by the shaded area in the following periodic table are all

Accepted Answer

A) main-group elements. 
B) main-group metals. 
C) nonmetals. 
D) semimetals. 
A) main-group elements. 
B) main-group metals. 
C) nonmetals. 
D) semimetals.

Question 17

Ring strain the cause of high molecular reactivity that occurs when the angles in a ring of atoms are not close to "normal" bond angles (90° when the bonds are formed by atoms using pure p-orbitals,109.5° using sp3 hybrid orbitals,120° using sp2 orbitals,etc. ).The angles in white phosphorus,P4,measure ________,and P4 ________ (is,is not)expected to exhibit ring strain and be very reactive.

Accepted Answer

Question 18

Some commercial drain cleaners contain aluminum chips and sodium hydroxide pellets.When water is added to this mixture a vigorous reaction takes place which is best represented as:

Accepted Answer

A) 2 Al(s)+ 6 H+(aq)→ 2 Al3+(aq)+ 3 H2(g). 
B) 2 Al(s)+ 2 OH-(aq)+ 6 H2O(l)→ 2 Al(OH)4-(aq)+ 3 H2(g). 
C) 2 Al(s)+ 6 H2O(l)→ 2 Al(OH)3 + 3 H2(g). 
D) 2 Al(s)+ 3 Cu2+(aq)→ 2 Al3+(aq)+ 2 Cu(s). 
A) 2 Al(s)+ 6 H+(aq)→ 2 Al3+(aq)+ 3 H2(g). 
B) 2 Al(s)+ 2 OH-(aq)+ 6 H2O(l)→ 2 Al(OH)4-(aq)+ 3 H2(g). 
C) 2 Al(s)+ 6 H2O(l)→ 2 Al(OH)3 + 3 H2(g). 
D) 2 Al(s)+ 3 Cu2+(aq)→ 2 Al3+(aq)+ 2 Cu(s).

Question 19

The ratio of oxygen atoms to silicon atoms in orthosilicate,single-strand silicates,double-strand silicates,and cyclic silicates is ________,________,________,and ________,respectively.

Accepted Answer

4:1,3:1,2.

Question 20

A 0.01 M aqueous solution of which of the following is the most basic?

Accepted Answer

A) NaClO 
B) NaClO2 
C) NaClO3 
D) NaClO4 
A) NaClO 
B) NaClO2 
C) NaClO3 
D) NaClO4

Exam 19: The Main-Group Elements

What is the basic building block of all silicates?

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

-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)?

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

What is the most acidic oxide of phosphorus?

The double-stranded silicate ion shown in the picture below combines with calcium and magnesium to form the mineral tremolite,which is a form of asbestos.What is the formula and charge of the repeating unit of the silicate ion?

Shown below are four oxoanions of sulfur.Small gray spheres represent hydrogen,unshaded spheres represent oxygen,and dotted spheres represent sulfur. -Which oxoanion is the weakest base?

What statement about nitric acid is not true?

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

What is the formula and charge of the silicate anion represented by the picture below?

-Which element indicated on the above periodic table forms a binary hydride with molecular structure (4)shown above?

Which one of the following is not a main group element?

What are appropriate methods for the generation of H2S? Reaction 1: FeS(s)+ 2 H+(aq)→ H2S(g)+ Fe2+(aq) Reaction 2: CH3C(CS)NH2(aq)+ H2O(l)+ heat → CH3(CO)NH2(aq)+ H2S(aq) Reaction 3: 3 S(g)+ 2 H2O(g)→ SO2(g)+ 2 H2S(g) Reaction 4: 2 SO2(g)+ 2 H2O(g)→ 2 H2S(g)+ 3 O2(g)

Which compound exhibits pi bonding?

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

The elements indicated by the shaded area in the following periodic table are all

Some commercial drain cleaners contain aluminum chips and sodium hydroxide pellets.When water is added to this mixture a vigorous reaction takes place which is best represented as:

The ratio of oxygen atoms to silicon atoms in orthosilicate,single-strand silicates,double-strand silicates,and cyclic silicates is ________,________,________,and ________,respectively.

A 0.01 M aqueous solution of which of the following is the most basic?

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

Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

Nuclear Chemistry

Organic and Biological Chemistry

Filters

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

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

The ratio of oxygen atoms to silicon atoms in orthosilicate,single-strand silicates,double-strand silicates,and cyclic silicates is ,,,and ,respectively.