Question 1

-Which of the elements indicated on the above periodic table forms a common allotrope having molecular structure (3)?

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 2

-Which of the elements indicated on the above periodic table has a common allotrope stable at 25°C having molecular structure (1)?

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 3

Which elements of group 3A are commonly used in semiconductors?

Accepted Answer

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

Question 4

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 5

In the picture representing binary hydride AHx,lightly-shaded spheres represent H atoms or ions and darkly-shaded spheres represent atoms or ions of the other element,A.If A is a second-period element,the oxidation state of hydrogen and the oxidation state of element A in the binary hydride shown below are

Accepted Answer

A) +1 and -3. 
B) +1 and -1. 
C) -1 and +1. 
D) -1 and +3. 
A) +1 and -3. 
B) +1 and -1. 
C) -1 and +1. 
D) -1 and +3.

Question 6

The number of semimetals in group 4A of the periodic table is ________.

Accepted Answer

The answer of The number of semimetals in group 4A...

Question 7

What is not a reaction commonly associated with cyanide ion?

Accepted Answer

A) H+(aq)+ CN-(aq)→ HCN(aq) 
B) Ag+(aq)+ CN-(aq)→ AgCN(s) 
C) 4 Au(s)+ 8 CN-(aq)+ O2(g)+ 2 H2O(l)→ 4 Au(CN)2-(aq)+ 4 OH-(aq) 
D) CN-(aq)+ H2(g)→ HCN(aq)+ H-(aq) 
A) H+(aq)+ CN-(aq)→ HCN(aq) 
B) Ag+(aq)+ CN-(aq)→ AgCN(s) 
C) 4 Au(s)+ 8 CN-(aq)+ O2(g)+ 2 H2O(l)→ 4 Au(CN)2-(aq)+ 4 OH-(aq) 
D) CN-(aq)+ H2(g)→ HCN(aq)+ H-(aq)

Question 8

Which element of group 4A has the greatest density?

Accepted Answer

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

Question 9

What is the oxidation number of H in H2?

Accepted Answer

A) 0 
B) -2 
C) +3 
D) +1 
A) 0 
B) -2 
C) +3 
D) +1

Question 10

Which is classified as an ionic binary oxide?

Accepted Answer

A) BaO 
B) CO2 
C) N2O5 
D) SO3 
A) BaO 
B) CO2 
C) N2O5 
D) SO3

Question 11

Describe the color changes when sulfur (melting point 113°C,boiling point 445°C)is heated from 25°C to 500°C? It turns from a yellow solid to a

Accepted Answer

A) dark reddish brown liquid and then boils. 
B) reddish brown solid and then into reddish brown liquid and then boils. 
C) straw colored liquid which turns dark reddish brown and then it boils. 
D) yellow liquid and then it boils. 
A) dark reddish brown liquid and then boils. 
B) reddish brown solid and then into reddish brown liquid and then boils. 
C) straw colored liquid which turns dark reddish brown and then it boils. 
D) yellow liquid and then it boils.

Question 12

Compared to the terminal B-H bonds the bridging H-B bonds in B2H6 are

Accepted Answer

A) longer and stronger. 
B) longer and weaker. 
C) shorter and stronger. 
D) shorter and weaker. 
A) longer and stronger. 
B) longer and weaker. 
C) shorter and stronger. 
D) shorter and weaker.

Question 13

Electrical conductivity in graphite is maximized

Accepted Answer

A) parallel to the pi framework and parallel to the planar C atom framework. 
B) perpendicular to the pi framework and parallel to the planar C atom framework. 
C) parallel to the pi framework and perpendicular to the planar C atom framework. 
D) perpendicular to the pi framework and perpendicular to the planar C atom framework. 
A) parallel to the pi framework and parallel to the planar C atom framework. 
B) perpendicular to the pi framework and parallel to the planar C atom framework. 
C) parallel to the pi framework and perpendicular to the planar C atom framework. 
D) perpendicular to the pi framework and perpendicular to the planar C atom framework.

Question 14

Which is not generally considered to be a chemical reaction of the alkaline earth metal calcium?

Accepted Answer

A) Ca(s)+ Cl2(g)→ CaCl2(s) 
B) 2 Ca(s)+ 2 H2O(l)→ 2 Ca(OH)2(aq)+ H2(g) 
C) 6 Ca(s)+ 2 N2(g)→ 2 Ca3N2(s) 
D) Ca(s)+ O2(g)→ CaO2(s) 
A) Ca(s)+ Cl2(g)→ CaCl2(s) 
B) 2 Ca(s)+ 2 H2O(l)→ 2 Ca(OH)2(aq)+ H2(g) 
C) 6 Ca(s)+ 2 N2(g)→ 2 Ca3N2(s) 
D) Ca(s)+ O2(g)→ CaO2(s)

Question 15

What is the ground state valence shell electron configuration of a group 4A element?

Accepted Answer

A) ns0 np4 
B) ns1 np3 
C) ns2 np2 
D) ns2 np4 
A) ns0 np4 
B) ns1 np3 
C) ns2 np2 
D) ns2 np4

Question 16

What statement is inconsistent about carbon monoxide?

Accepted Answer

A) It is a colorless,odorless and toxic gas. 
B) It is formed by burning carbon or hydrocarbon in excess oxygen. 
C) One of its main industrial uses is in the synthesis of methanol,CH3OH. 
D) Toxicity of CO results from its ability to bond strongly to iron(II)atom in hemoglobin. 
A) It is a colorless,odorless and toxic gas. 
B) It is formed by burning carbon or hydrocarbon in excess oxygen. 
C) One of its main industrial uses is in the synthesis of methanol,CH3OH. 
D) Toxicity of CO results from its ability to bond strongly to iron(II)atom in hemoglobin.

Question 17

Of Na2O,SO2,and SO3,equimolar aqueous solutions of ________ would be most acidic and of ________ would be most basic.

Accepted Answer

Question 18

The net ionic reaction of solid CaH2 with water is

Accepted Answer

A) CaH2(s)+ 2 H2O(l)→ Ca(OH)2(aq)+ 2 H2(g). 
B) CaH2(s)+ 2 H2O(l)→ Ca2+(aq)+ 2 OH-(aq)+ 2 H2(g). 
C) H-(aq)+ H2O(l)→ OH-(aq)+ H2(g). 
D) CaH2(s)+ H2O(l)→ CaO(s)+ 2 H2(g). 
A) CaH2(s)+ 2 H2O(l)→ Ca(OH)2(aq)+ 2 H2(g). 
B) CaH2(s)+ 2 H2O(l)→ Ca2+(aq)+ 2 OH-(aq)+ 2 H2(g). 
C) H-(aq)+ H2O(l)→ OH-(aq)+ H2(g). 
D) CaH2(s)+ H2O(l)→ CaO(s)+ 2 H2(g).

Question 19

The following pictures represent binary hydrides,AHS1U1B1xS1U1B0,where A = Na,Ti,C,or Cl.Lightly-shaded spheres represent H atoms or ions and darkly-colored spheres represent atoms or ions of element A.  
-Which hydride dissolves in water to form an acidic solution?

Accepted Answer

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

Question 20

-Which element shown on the periodic table above forms an ionic binary hydride with the formula MX2?

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

Exam 22: The Main-Group Elements

-Which of the elements indicated on the above periodic table forms a common allotrope having molecular structure (3)?

-Which of the elements indicated on the above periodic table has a common allotrope stable at 25°C having molecular structure (1)?

Which elements of group 3A are commonly used in semiconductors?

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

The number of semimetals in group 4A of the periodic table is ________.

What is not a reaction commonly associated with cyanide ion?

Which element of group 4A has the greatest density?

What is the oxidation number of H in H2?

Which is classified as an ionic binary oxide?

Describe the color changes when sulfur (melting point 113°C,boiling point 445°C)is heated from 25°C to 500°C? It turns from a yellow solid to a

Compared to the terminal B-H bonds the bridging H-B bonds in B2H6 are

Electrical conductivity in graphite is maximized

Which is not generally considered to be a chemical reaction of the alkaline earth metal calcium?

What is the ground state valence shell electron configuration of a group 4A element?

What statement is inconsistent about carbon monoxide?

Of Na2O,SO2,and SO3,equimolar aqueous solutions of ________ would be most acidic and of ________ would be most basic.

The net ionic reaction of solid CaH2 with water is

The following pictures represent binary hydrides,AHx,where A = Na,Ti,C,or Cl.Lightly-shaded spheres represent H atoms or ions and darkly-colored spheres represent atoms or ions of element A. -Which hydride dissolves in water to form an acidic solution?

-Which element shown on the periodic table above forms an ionic binary hydride with the formula MX2?

Chemical Tools: Experimentation and Measurement

Atoms, molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solutions

Periodicity and the Electronic Structure of Atoms

Ionic Compounds: Periodic Trends and Bonding

Covalent Bonding and Electron-Dot Structures

Covalent Compounds: Bonding Theories 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

Nuclear Chemistry

Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

Connections to Organic and Biological Chemistry

Filters

What is the oxidation number of H in H₂?

Compared to the terminal B-H bonds the bridging H-B bonds in B₂H₆are

Of Na₂O,SO₂,and SO₃,equimolar aqueous solutions of would be most acidic and of would be most basic.

The net ionic reaction of solid CaH₂ with water is

The following pictures represent binary hydrides,AH_x,where A = Na,Ti,C,or Cl.Lightly-shaded spheres represent H atoms or ions and darkly-colored spheres represent atoms or ions of element A. -Which hydride dissolves in water to form an acidic solution?

-Which element shown on the periodic table above forms an ionic binary hydride with the formula MX₂?