Question 1

Which one of the following is a free radical?

Accepted Answer

A) H₂S 
B) NO 
C) NH₃ 
D) CF₄ 
A) H₂S 
B) NO 
C) NH₃ 
D) CF₄

Question 2

CrO₄²⁻ is the chromic ion.

Accepted Answer

A) True 
 B)False

Question 3

Atoms will tend to gain or lose electrons in order to form a noble gas configuration.

Accepted Answer

A) True 
 B)False

Question 4

The best description of the shape of a boron trifluoride (BF₃)molecule is

Accepted Answer

A) pyramidal. 
B) trigonal planar. 
C) tetrahedral. 
D) linear. 
A) pyramidal. 
B) trigonal planar. 
C) tetrahedral. 
D) linear.

Question 5

Which of the following molecules is polar?

Accepted Answer

A) O₂ 
B) CCl₄ 
C) CH₂Cl₂ 
D) CO₂ 
A) O₂ 
B) CCl₄ 
C) CH₂Cl₂ 
D) CO₂

Question 6

The number of electrons in a sulfide ion,S²⁻,is

Accepted Answer

A) 16. 
B) 14. 
C) 18. 
D) 32. 
A) 16. 
B) 14. 
C) 18. 
D) 32.

Question 7

Methane is the common name for which molecule?

Accepted Answer

A) NH₃ 
B) CH₄ 
C) HF 
D) CF₄ 
A) NH₃ 
B) CH₄ 
C) HF 
D) CF₄

Question 8

The attraction between positive and negative ions is known as a(n)

Accepted Answer

A) covalent bond. 
B) crystal bond. 
C) ionic bond. 
D) molecular bond. 
A) covalent bond. 
B) crystal bond. 
C) ionic bond. 
D) molecular bond.

Question 9

An atom with four valence electrons will form ________ bond(s)with other atoms.

Accepted Answer

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

Question 10

What is the name of the compound with the formula N₂O₄?

Accepted Answer

dinitrogen

Question 11

If a central atom has a total of two electron sets and no lone pairs attached to it,the geometry about the central atom is

Accepted Answer

A) linear. 
B) trigonal planar. 
C) tetrahedral. 
D) pyramidal. 
A) linear. 
B) trigonal planar. 
C) tetrahedral. 
D) pyramidal.

Question 12

An atom with eight valence electrons will form a bond with only one other atom.

Accepted Answer

A) True 
 B)False

Question 13

Oxygen forms monatomic ions with a charge of

Accepted Answer

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

Question 14

When magnesium combines with oxygen,the reaction involves a

Accepted Answer

A) transfer of electrons from Mg to O. 
B) transfer of electrons from O to Mg. 
C) sharing of electrons between Mg and O. 
D) conversion of protons into electrons. 
A) transfer of electrons from Mg to O. 
B) transfer of electrons from O to Mg. 
C) sharing of electrons between Mg and O. 
D) conversion of protons into electrons.

Question 15

Potassium reacts with iodine to form

Accepted Answer

A) KI. 
B) K₂I. 
C) KI₂. 
D) K₂I₃. 
A) KI. 
B) K₂I. 
C) KI₂. 
D) K₂I₃.

Question 16

Noble gases are unreactive because of their electronic structures.The kind of reasoning that states "if other elements could be made to achieve noble gas electronic structures they would be more stable" is called

Accepted Answer

A) logic. 
B) inductive reasoning. 
C) deductive reasoning. 
D) critical thinking. 
A) logic. 
B) inductive reasoning. 
C) deductive reasoning. 
D) critical thinking.

Question 17

All of the following statements about molecular recognition processes are true EXCEPT

Accepted Answer

A) they require smaller amounts of solvents than traditional methods do. 
B) they contribute greatly to polluting the environment than traditional methods do. 
C) they can be carried out at lower temperatures than traditional methods do. 
D) they use less energy than traditional methods do. 
A) they require smaller amounts of solvents than traditional methods do. 
B) they contribute greatly to polluting the environment than traditional methods do. 
C) they can be carried out at lower temperatures than traditional methods do. 
D) they use less energy than traditional methods do.

Question 18

Which is the electron dot structure of magnesium?

Accepted Answer

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

Question 19

Which substance has ionic bonds?

Accepted Answer

A) O₂ 
B) BaO 
C) H₂O 
D) OF₂ 
A) O₂ 
B) BaO 
C) H₂O 
D) OF₂

Question 20

A compound with polar bonds must be polar.

Accepted Answer

A) True 
 B)False

Exam 4: Chemical Bonds

Which one of the following is a free radical?

CrO₄²⁻ is the chromic ion.

Atoms will tend to gain or lose electrons in order to form a noble gas configuration.

The best description of the shape of a boron trifluoride (BF₃)molecule is

Which of the following molecules is polar?

The number of electrons in a sulfide ion,S²⁻,is

Methane is the common name for which molecule?

The attraction between positive and negative ions is known as a(n)

An atom with four valence electrons will form ________ bond(s)with other atoms.

What is the name of the compound with the formula N₂O₄?

If a central atom has a total of two electron sets and no lone pairs attached to it,the geometry about the central atom is

An atom with eight valence electrons will form a bond with only one other atom.

Oxygen forms monatomic ions with a charge of

When magnesium combines with oxygen,the reaction involves a

Potassium reacts with iodine to form

Noble gases are unreactive because of their electronic structures.The kind of reasoning that states "if other elements could be made to achieve noble gas electronic structures they would be more stable" is called

All of the following statements about molecular recognition processes are true EXCEPT

Which is the electron dot structure of magnesium?

Which substance has ionic bonds?

A compound with polar bonds must be polar.

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