Question 1

As one traverses the periodic table from left to right,the effective nuclear charge Zeff increases.As a result of this the periodic properties of ________.

Accepted Answer

A) atomic size increases,IE increases,EA increases and electronegativity increases 
B) atomic size decreases,IE increases,EA increases and electronegativity increases 
C) atomic size decreases,IE decreases,EA increases and electronegativity increases 
D) atomic size decreases,IE increases,EA decreases and electronegativity increases 
A) atomic size increases,IE increases,EA increases and electronegativity increases 
B) atomic size decreases,IE increases,EA increases and electronegativity increases 
C) atomic size decreases,IE decreases,EA increases and electronegativity increases 
D) atomic size decreases,IE increases,EA decreases and electronegativity increases

Question 2

What are the signs are expected for the entropy change ΔS and free energy change ΔG for the reaction below?
N2H4(l)+ N2O4(l)→ 3 N2(g)+ 4 H2O(g)ΔH = -1049 kJ

Accepted Answer

A) ΔS = + and ΔG = + 
B) ΔS = + and ΔG = - 
C) ΔS = - and ΔG = + 
D) ΔS = - and ΔG = - 
A) ΔS = + and ΔG = + 
B) ΔS = + and ΔG = - 
C) ΔS = - and ΔG = + 
D) ΔS = - and ΔG = -

Question 3

What is responsible for the brownish colored gas when copper dissolves in nitric acid?

Accepted Answer

A) 2 NO(g)+ O2(g)→ 2 NO2(g) 
B) 2 N2(g)+ O2(g)→ 2 NO(g) 
C) NH4NO3(l)→ N2O(g)+ 2 H2O(g) 
D) 2 NO2(g)→ N2O4(g) 
A) 2 NO(g)+ O2(g)→ 2 NO2(g) 
B) 2 N2(g)+ O2(g)→ 2 NO(g) 
C) NH4NO3(l)→ N2O(g)+ 2 H2O(g) 
D) 2 NO2(g)→ N2O4(g)

Question 4

What statement is inconsistent about graphite?

Accepted Answer

A) Carbon sheets are separated by a distance of 335 pm and are held together by weak London dispersion forces. 
B) Electrical conductivity parallel to the planar sheets is 1020 times greater than the conductivity of diamond. 
C) Pi electrons are delocalized and free to move perpendicular to the plane of the hexagonal sheets. 
D) A two-dimensional sheetlike structure in which each C atom uses sp2 hybrid orbitals. 
A) Carbon sheets are separated by a distance of 335 pm and are held together by weak London dispersion forces. 
B) Electrical conductivity parallel to the planar sheets is 1020 times greater than the conductivity of diamond. 
C) Pi electrons are delocalized and free to move perpendicular to the plane of the hexagonal sheets. 
D) A two-dimensional sheetlike structure in which each C atom uses sp2 hybrid orbitals.

Question 5

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 6

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

Accepted Answer

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

Question 7

Which element of group 6A has the highest melting point?

Accepted Answer

A) S 
B) Se 
C) Te 
D) Po 
A) S 
B) Se 
C) Te 
D) Po

Question 8

What is the most metallic element of group 3A?

Accepted Answer

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

Question 9

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 10

What is the hybridization of boron in diborane B2H6?

Accepted Answer

A) sp 
B) sp2 
C) sp3 
D) None of these 
A) sp 
B) sp2 
C) sp3 
D) None of these

Question 11

Carbon combines with some metals and semimetals to form carbides.What is the formula of aluminum carbide?

Accepted Answer

The answer of Carbon combines with some metals and semimetals...

Question 12

What is the chemical formula of "fool's gold"?

Accepted Answer

A) cinnabar,HgS 
B) galena,PbS 
C) gypsum,CaSO4↔2H2O 
D) pyrite,FeS2 
A) cinnabar,HgS 
B) galena,PbS 
C) gypsum,CaSO4↔2H2O 
D) pyrite,FeS2

Question 13

Which group 3A element has the highest electronegativity?

Accepted Answer

A) B 
B) Al 
C) Ga 
D) In 
A) B 
B) Al 
C) Ga 
D) In

Question 14

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

Accepted Answer

Question 15

Which statement is most inconsistent with the chemistry of silicon?

Accepted Answer

A) In nature,it is generally found combined with oxygen in SiO2 and in various silicate minerals. 
B) It crystallizes in a diamond-like structure and does not form the graphite-like allotrope. 
C) It is a hard,gray,semiconducting solid that melts at 1410°C. 
D) It is obtained by oxidation of silica sand with coke. 
A) In nature,it is generally found combined with oxygen in SiO2 and in various silicate minerals. 
B) It crystallizes in a diamond-like structure and does not form the graphite-like allotrope. 
C) It is a hard,gray,semiconducting solid that melts at 1410°C. 
D) It is obtained by oxidation of silica sand with coke.

Question 16

One of the group 3A elements is extremely toxic due to the similarities in chemistry of one of its ions to alkali metal chemistry.Which element is it?

Accepted Answer

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

Question 17

Diopside,CaMgSi2O6,is an example of a(n)________ (orthosilicate,single-strand silicate,double-strand silicate,and cyclic silicate).

Accepted Answer

single-str

Question 18

What statement is not characteristic about group 6A elements?

Accepted Answer

A) Oxygen,sulfur,and selenium are typical nonmetals while tellurium is a semi-metal. 
B) Oxygen is a powerful oxidizing agent but H2Se and H2Te are good reducing agents. 
C) S,Se,and Te are much less electronegative than oxygen and commonly have positive oxidation states. 
D) The favored oxidation state of Te and Po is +2. 
A) Oxygen,sulfur,and selenium are typical nonmetals while tellurium is a semi-metal. 
B) Oxygen is a powerful oxidizing agent but H2Se and H2Te are good reducing agents. 
C) S,Se,and Te are much less electronegative than oxygen and commonly have positive oxidation states. 
D) The favored oxidation state of Te and Po is +2.

Question 19

Which of the following species has its N atom or atoms in the -1 oxidation state?

Accepted Answer

A) N2H4 
B) NH2OH 
C) N2O 
D) HONO 
A) N2H4 
B) NH2OH 
C) N2O 
D) HONO

Question 20

The first ionization energy of gallium is greater than that of aluminum and the first ionization energy of thallium is greater than that of indium.A possible explanation for this is:

Accepted Answer

A) This is the normal trend in ionization energy. 
B) Both Ga and Tl prefer to lose three electrons rather than one. 
C) Both Ga and Tl follow transition elements which are excellent shielders of nuclear charge. 
D) Ga follows a series of transition elements and Tl follows both a series of transition elements and inner transition elements which are poor shielders of nuclear charge. 
A) This is the normal trend in ionization energy. 
B) Both Ga and Tl prefer to lose three electrons rather than one. 
C) Both Ga and Tl follow transition elements which are excellent shielders of nuclear charge. 
D) Ga follows a series of transition elements and Tl follows both a series of transition elements and inner transition elements which are poor shielders of nuclear charge.

Exam 19: The Main-Group Elements

As one traverses the periodic table from left to right,the effective nuclear charge Zeff increases.As a result of this the periodic properties of ________.

What are the signs are expected for the entropy change ΔS and free energy change ΔG for the reaction below? N2H4(l)+ N2O4(l)→ 3 N2(g)+ 4 H2O(g)ΔH = -1049 kJ

What is responsible for the brownish colored gas when copper dissolves in nitric acid?

What statement is inconsistent about graphite?

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

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

Which element of group 6A has the highest melting point?

What is the most metallic element of group 3A?

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

What is the hybridization of boron in diborane B2H6?

Carbon combines with some metals and semimetals to form carbides.What is the formula of aluminum carbide?

What is the chemical formula of "fool's gold"?

Which group 3A element has the highest electronegativity?

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

Which statement is most inconsistent with the chemistry of silicon?

One of the group 3A elements is extremely toxic due to the similarities in chemistry of one of its ions to alkali metal chemistry.Which element is it?

Diopside,CaMgSi2O6,is an example of a(n)________ (orthosilicate,single-strand silicate,double-strand silicate,and cyclic silicate).

What statement is not characteristic about group 6A elements?

Which of the following species has its N atom or atoms in the -1 oxidation state?

The first ionization energy of gallium is greater than that of aluminum and the first ionization energy of thallium is greater than that of indium.A possible explanation for this is:

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

As one traverses the periodic table from left to right,the effective nuclear charge Z_eff increases.As a result of this the periodic properties of ________.

What are the signs are expected for the entropy change ΔS and free energy change ΔG for the reaction below? N₂H₄(l)+ N₂O₄(l)→ 3 N₂(g)+ 4 H₂O(g)ΔH = -1049 kJ

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 hybridization of boron in diborane B₂H₆?

The oxidation numbers of nitrogen in NH₄NO₃ are and .

Diopside,CaMgSi₂O₆,is an example of a(n)________ (orthosilicate,single-strand silicate,double-strand silicate,and cyclic silicate).