Question 1

What type of chemical bond holds the atoms together within a water molecule?

Accepted Answer

A) Ionic bond 
B) Nonpolar covalent bond 
C) Polar covalent bond 
D) Coordinate covalent bond 
A) Ionic bond 
B) Nonpolar covalent bond 
C) Polar covalent bond 
D) Coordinate covalent bond

Question 2

Which one of the following compounds utilizes both ionic and covalent bonding?

Accepted Answer

A) Na2SO4 
B) AlCl3 
C) PO43- 
D) NH4+ 
E) CaO 
A) Na2SO4 
B) AlCl3 
C) PO43- 
D) NH4+ 
E) CaO

Question 3

The Lewis dot symbol for the chloride ion is

Accepted Answer

A)      
B)      - 
C)      - 
D)      - 
E) Cl- 
A)      
B)      - 
C)      - 
D)      - 
E) Cl-

Question 4

Which of the elements listed below would most likely form an ionic bond when bonded to oxygen?

Accepted Answer

A) Cl 
B) C 
C) O 
D) H 
E) Ca 
A) Cl 
B) C 
C) O 
D) H 
E) Ca

Question 5

Write the Lewis structure of ammonia (nitrogen trihydride).

Accepted Answer

The answer of Write the Lewis structure of ammonia (nitrogen...

Question 6

Which of the elements listed below would most likely form a polar covalent bond when bonded to oxygen?

Accepted Answer

A) Mg 
B) H 
C) Al 
D) O 
E) Na 
A) Mg 
B) H 
C) Al 
D) O 
E) Na

Question 7

The formal charge on the bromine atom in BrO3- drawn with three single bonds is

Accepted Answer

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

Question 8

Which one of the following is most likely to be a covalent compound?

Accepted Answer

A) Rb2O 
B) BaO 
C) SrO 
D) SeO2 
E) MnO2 
A) Rb2O 
B) BaO 
C) SrO 
D) SeO2 
E) MnO2

Question 9

The number of resonance structures for the sulfur dioxide molecule that satisfy the octet rule is

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) None of these 
A) 1 
B) 2 
C) 3 
D) 4 
E) None of these

Question 10

The properties and chemical reactivity of a molecule is best explained by analyzing all possible resonance structures for that molecule

Accepted Answer

A) True 
 B)False

Question 11

Which one of these polar covalent bonds would have the greatest percent ionic character?

Accepted Answer

A) H - Br 
B) H - Cl 
C) H - F 
D) H - I 
A) H - Br 
B) H - Cl 
C) H - F 
D) H - I

Question 12

Estimate the enthalpy change for the combustion of one mole of acetylene, C2H2, to form carbon dioxide and water vapor. BE(C-H)= 456 kJ/mol
BE(C=C)= 962 kJ/mol
BE(O=O)= 499 kJ/mol
BE(C=O)= 802 kJ/mol
BE(O-H)= 462 kJ/mol

Accepted Answer

A) +1010 kJ/mol 
B) +653 kJ/mol 
C) -155 kJ/mol 
D) -1010 kJ/mol 
E) -1759 kJ/mol 
A) +1010 kJ/mol 
B) +653 kJ/mol 
C) -155 kJ/mol 
D) -1010 kJ/mol 
E) -1759 kJ/mol

Question 13

Calculate the energy change for the reaction K(g)+ Br(g)$\rarr$ K+(g)+ Br- (g)
Given the following ionization energy (IE)and electron affinity (EA)values

Accepted Answer

A) -1,092 kJ/mol 
B) -95 kJ/mol 
C) 95 kJ/mol 
D) 1,092 kJ/mol 
E) 1,187 kJ/mol 
A) -1,092 kJ/mol 
B) -95 kJ/mol 
C) 95 kJ/mol 
D) 1,092 kJ/mol 
E) 1,187 kJ/mol

Question 14

Which of the following solids would have the lowest melting point?

Accepted Answer

A) KI 
B) KBr 
C) KCl 
D) KF 
A) KI 
B) KBr 
C) KCl 
D) KF

Question 15

The electron dot formula for O2 shows

Accepted Answer

A) a single covalent bond 
B) a double covalent bond 
C) an ionic bond 
D) a total of 8 x 2 = 16 electron dots 
E) a total of 32 electron dots 
A) a single covalent bond 
B) a double covalent bond 
C) an ionic bond 
D) a total of 8 x 2 = 16 electron dots 
E) a total of 32 electron dots

Question 16

Assuming the octet rule is obeyed, how many covalent bonds will a carbon atom form to give a formal charge of zero?

Accepted Answer

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

Question 17

The standard enthalpy of formation of ammonia at 25°C is -46.3 kJ/mol.Estimate the N-H bond enthalpy at this temperature. (Given: BE(N$\equiv$N)=941.4 kJ/mol, BE(H-H)= 436.4 kJ/mol)

Accepted Answer

A) 360 kJ/mol 
B) 383 kJ/mol 
C) 391 kJ/mol 
D) 459 kJ/mol 
E) 475 kJ/mol 
A) 360 kJ/mol 
B) 383 kJ/mol 
C) 391 kJ/mol 
D) 459 kJ/mol 
E) 475 kJ/mol

Question 18

The number of lone electron pairs in the N2 molecule is ___.

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Question 19

Assuming the octet rule is obeyed, how many covalent bonds will a nitrogen atom form to give a formal charge of zero?

Accepted Answer

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

Question 20

Write the Lewis dot symbol for the sulfide ion.

Accepted Answer

The answer of Write the Lewis dot symbol for the...

Exam 9: Chemical Bonding I: Basic Concepts

What type of chemical bond holds the atoms together within a water molecule?

Which one of the following compounds utilizes both ionic and covalent bonding?

The Lewis dot symbol for the chloride ion is

Which of the elements listed below would most likely form an ionic bond when bonded to oxygen?

Write the Lewis structure of ammonia (nitrogen trihydride).

Which of the elements listed below would most likely form a polar covalent bond when bonded to oxygen?

The formal charge on the bromine atom in BrO3- drawn with three single bonds is

Which one of the following is most likely to be a covalent compound?

The number of resonance structures for the sulfur dioxide molecule that satisfy the octet rule is

The properties and chemical reactivity of a molecule is best explained by analyzing all possible resonance structures for that molecule

Which one of these polar covalent bonds would have the greatest percent ionic character?

Estimate the enthalpy change for the combustion of one mole of acetylene, C2H2, to form carbon dioxide and water vapor. BE(C-H)= 456 kJ/mol BE(C=C)= 962 kJ/mol BE(O=O)= 499 kJ/mol BE(C=O)= 802 kJ/mol BE(O-H)= 462 kJ/mol

Calculate the energy change for the reaction K(g)+ Br(g) →\rarr→ K+(g)+ Br- (g) Given the following ionization energy (IE)and electron affinity (EA)values

Which of the following solids would have the lowest melting point?

The electron dot formula for O2 shows

Assuming the octet rule is obeyed, how many covalent bonds will a carbon atom form to give a formal charge of zero?

The standard enthalpy of formation of ammonia at 25°C is -46.3 kJ/mol.Estimate the N-H bond enthalpy at this temperature. (Given: BE(N ≡\equiv≡ N)=941.4 kJ/mol, BE(H-H)= 436.4 kJ/mol)

The number of lone electron pairs in the N2 molecule is ___.

Assuming the octet rule is obeyed, how many covalent bonds will a nitrogen atom form to give a formal charge of zero?

Write the Lewis dot symbol for the sulfide ion.

Chemistry: the Study of Change

Atoms, Molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solutions

Gases

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Periodic Relationships Among the Elements

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy Free Energy and Equilibrium

Electrochemistry

Nuclear Chemistry

Chemistry in the Atmosphere

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metal Chemistry and Coordination Compounds

Organic Chemistry

Synthetic and Natural Organic Polymers

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The formal charge on the bromine atom in BrO₃^-drawn with three single bonds is

Estimate the enthalpy change for the combustion of one mole of acetylene, C₂H₂, to form carbon dioxide and water vapor. BE(C-H)= 456 kJ/mol BE(C=C)= 962 kJ/mol BE(O=O)= 499 kJ/mol BE(C=O)= 802 kJ/mol BE(O-H)= 462 kJ/mol

The electron dot formula for O₂ shows

The standard enthalpy of formation of ammonia at 25°C is -46.3 kJ/mol.Estimate the N-H bond enthalpy at this temperature. (Given: BE(N $\equiv$ N)=941.4 kJ/mol, BE(H-H)= 436.4 kJ/mol)

The number of lone electron pairs in the N₂ molecule is ___.