Question 1

Element A has an electronegativity of 0.8 and element B has an electronegativity of 2.0. Which statement best describes the bonding in A3B?

Accepted Answer

A) The AB bond is largely covalent with a δ− on A. 
B) The AB bond is largely covalent with a δ + on A. 
C) The compound is largely ionic with no polar bonds. 
D) The compound is largely covalent with no polar bonds. 
E) There is insufficient information. 
A) The AB bond is largely covalent with a δ− on A. 
B) The AB bond is largely covalent with a δ + on A. 
C) The compound is largely ionic with no polar bonds. 
D) The compound is largely covalent with no polar bonds. 
E) There is insufficient information. B

Question 2

Which of these is\are polar molecule(s)with a tetrahedral electron geometry?
I. NCl3
II. H2O
III. CH3Cl
IV. SiH4

Accepted Answer

A) I only 
B) I and III 
C) I, II, and III 
D) III only 
E) II and III 
A) I only 
B) I and III 
C) I, II, and III 
D) III only 
E) II and III E

Question 3

How many bonding pairs of electrons are around the central atom in HCN?

Accepted Answer

A) 0 
B) 1 
C) 2 
D) 3 
E) 4 
A) 0 
B) 1 
C) 2 
D) 3 
E) 4 E

Question 4

The total number of valence electrons in NO2 −1  is

Accepted Answer

A) 16 
B) 17 
C) 18 
D) none of the above 
A) 16 
B) 17 
C) 18 
D) none of the above

Question 5

Which of these molecules will have a linear electron geometry and a linear molecular geometry?

Accepted Answer

A) PCl3 
B) H2O 
C) CO 
D) CH3Cl 
E) BF3 
A) PCl3 
B) H2O 
C) CO 
D) CH3Cl 
E) BF3

Question 6

How many lone pairs of electrons are around the central atom in SO2?

Accepted Answer

A) 0 
B) 1 
C) 2 
D) 3 
E) 4 
A) 0 
B) 1 
C) 2 
D) 3 
E) 4

Question 7

Which of the following is true for sodium?

Accepted Answer

A) It is most stable as an atom. 
B) It is most stable as a negatively charged ion. 
C) It is most stable as a positively charged ion. 
D) All forms of sodium are very stable. 
E) All forms of sodium are very unstable. 
A) It is most stable as an atom. 
B) It is most stable as a negatively charged ion. 
C) It is most stable as a positively charged ion. 
D) All forms of sodium are very stable. 
E) All forms of sodium are very unstable.

Question 8

Which of these would be expected to have a trigonal planar electron geometry?

Accepted Answer

A) I and II 
B) II and III 
C) I, II, and III 
D) I and III 
E) I only 
A) I and II 
B) II and III 
C) I, II, and III 
D) I and III 
E) I only

Question 9

A molecule with tetrahedral electron geometry could have which of the following molecular geometry?

Accepted Answer

A) Tetrahedral 
B) Trigonal pyramidal 
C) Bent 
D) All of the above 
A) Tetrahedral 
B) Trigonal pyramidal 
C) Bent 
D) All of the above

Question 10

Which of these molecules contains a triple bond?

Accepted Answer

A) PCl3 
B) N2 
C) SO2 
D) H2O 
E) CO2 
A) PCl3 
B) N2 
C) SO2 
D) H2O 
E) CO2

Question 11

How many lone pairs of electrons are around the central atom in H2O?

Accepted Answer

A) 0 
B) 1 
C) 2 
D) 3 
E) 4 
A) 0 
B) 1 
C) 2 
D) 3 
E) 4

Question 12

List the elements Na, K, Al, Cl, Cs in order of increasing electronegativity (from least to greatest).

Accepted Answer

A) Na < Cs < Al < K < Cl 
B) Cs < Na < K < Cl < Al 
C) Cl < Na < Al < K < Cs 
D) Cl < Al < Na < K < Cs 
E) Cs < K < Na < Al < Cl 
A) Na < Cs < Al < K < Cl 
B) Cs < Na < K < Cl < Al 
C) Cl < Na < Al < K < Cs 
D) Cl < Al < Na < K < Cs 
E) Cs < K < Na < Al < Cl

Question 13

Identify the fourth-row element X that forms the following  ion:
​

Accepted Answer

A) Ge 
B) As 
C) Se 
D) Kr 
E) Br 
A) Ge 
B) As 
C) Se 
D) Kr 
E) Br

Question 14

What is the molecular geometry of NH3?

Accepted Answer

A) Tetrahedral 
B) Bent 
C) Trigonal pyramidal 
D) Trigonal planar 
E) Linear 
A) Tetrahedral 
B) Bent 
C) Trigonal pyramidal 
D) Trigonal planar 
E) Linear

Question 15

Which of these theories is utilized in the prediction of molecular polarity?

Accepted Answer

A) Dalton's Theory 
B) VSEPR Theory 
C) Electronegativity 
D) Einstein's Relativity Theory 
E) Both B and C 
A) Dalton's Theory 
B) VSEPR Theory 
C) Electronegativity 
D) Einstein's Relativity Theory 
E) Both B and C

Question 16

Which of these theories is utilized in the prediction of molecular shapes?

Accepted Answer

A) Dalton's Theory 
B) VSEPR Theory 
C) Bohr's Atomic Theory 
D) Lewis Bonding Theory 
E) Einstein's Theory of Relativity 
A) Dalton's Theory 
B) VSEPR Theory 
C) Bohr's Atomic Theory 
D) Lewis Bonding Theory 
E) Einstein's Theory of Relativity

Question 17

Which of these is the correct Lewis dot structure for sulfur?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 18

Covalent bonds are formed when electrons are ____.

Accepted Answer

A) transferred 
B) split 
C) shared 
D) destroyed 
E) heated 
A) transferred 
B) split 
C) shared 
D) destroyed 
E) heated

Question 19

Identify the third-row element X which forms the following  compound:
​

Accepted Answer

A) S 
B) Cl 
C) P 
D) Si 
E) Al 
A) S 
B) Cl 
C) P 
D) Si 
E) Al

Question 20

Which of these is the correct Lewis dot structure for nitrogen, N2?

Accepted Answer

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

Element A has an electronegativity of 0.8 and element B has an electronegativity of 2.0. Which statement best describes the bonding in A₃B?

Which of these is\are polar molecule(s)with a tetrahedral electron geometry? I. NCl₃ II. H₂O III. CH₃Cl IV. SiH₄

How many bonding pairs of electrons are around the central atom in HCN?

The total number of valence electrons in NO₂⁻¹ is

Which of these molecules will have a linear electron geometry and a linear molecular geometry?

How many lone pairs of electrons are around the central atom in SO₂?

Which of the following is true for sodium?

Which of these would be expected to have a trigonal planar electron geometry?

A molecule with tetrahedral electron geometry could have which of the following molecular geometry?

Which of these molecules contains a triple bond?

How many lone pairs of electrons are around the central atom in H₂O?

List the elements Na, K, Al, Cl, Cs in order of increasing electronegativity (from least to greatest).

Identify the fourth-row element X that forms the following ion:

What is the molecular geometry of NH₃?

Which of these theories is utilized in the prediction of molecular polarity?

Which of these theories is utilized in the prediction of molecular shapes?

Which of these is the correct Lewis dot structure for sulfur?

Covalent bonds are formed when electrons are ____.

Identify the third-row element X which forms the following compound:

Which of these is the correct Lewis dot structure for nitrogen, N₂?

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Exam 5: Chemical Bonding

Element A has an electronegativity of 0.8 and element B has an electronegativity of 2.0. Which statement best describes the bonding in A3B?

Which of these is\are polar molecule(s)with a tetrahedral electron geometry? I. NCl3 II. H2O III. CH3Cl IV. SiH4

How many bonding pairs of electrons are around the central atom in HCN?

The total number of valence electrons in NO2 −1 is

Which of these molecules will have a linear electron geometry and a linear molecular geometry?

How many lone pairs of electrons are around the central atom in SO2?

Which of the following is true for sodium?

Which of these would be expected to have a trigonal planar electron geometry?

A molecule with tetrahedral electron geometry could have which of the following molecular geometry?

Which of these molecules contains a triple bond?

How many lone pairs of electrons are around the central atom in H2O?

List the elements Na, K, Al, Cl, Cs in order of increasing electronegativity (from least to greatest).

Identify the fourth-row element X that forms the following ion: ​

What is the molecular geometry of NH3?

Which of these theories is utilized in the prediction of molecular polarity?

Which of these theories is utilized in the prediction of molecular shapes?

Which of these is the correct Lewis dot structure for sulfur?

Covalent bonds are formed when electrons are ____.

Identify the third-row element X which forms the following compound: ​

Which of these is the correct Lewis dot structure for nitrogen, N2?

Molecular Reasons

The Chemists Toolbox

Atoms and Elements

Molecules, Compounds, and Chemical Reactions

Organic Chemistry

Light and Color

Nuclear Chemistry

Energy for Today

Energy for Tomorrow: Solar and Other Renewable Energy Sources

The Air Around Us

The Liquids and Solids Around Us: Especially Water

Acids and Bases: the Molecules Responsible for Sour and Bitter

Oxidation and Reduction

The Chemistry of Household Products

Biochemistry and Biotechnology

Drugs and Medicine: Healing, Helping, and Hurting

The Chemistry of Food

Nanotechnology

Filters

Element A has an electronegativity of 0.8 and element B has an electronegativity of 2.0. Which statement best describes the bonding in A₃B?

Which of these is\are polar molecule(s)with a tetrahedral electron geometry? I. NCl₃ II. H₂O III. CH₃Cl IV. SiH₄

The total number of valence electrons in NO₂⁻¹ is

How many lone pairs of electrons are around the central atom in SO₂?

How many lone pairs of electrons are around the central atom in H₂O?

Identify the fourth-row element X that forms the following ion:

What is the molecular geometry of NH₃?

Identify the third-row element X which forms the following compound:

Which of these is the correct Lewis dot structure for nitrogen, N₂?