Question 1

The VSEPR model of molecular structure requires a knowledge of ________ to predict the geometry of an atom in a molecule.

Accepted Answer

A) the number of atoms bonded to the atom of interest 
B) the total number of atoms in the molecule 
C) the number of electron pairs on the atom of interest 
D) both A and C 
E) none of the above 
A) the number of atoms bonded to the atom of interest 
B) the total number of atoms in the molecule 
C) the number of electron pairs on the atom of interest 
D) both A and C 
E) none of the above

Question 2

A section of the Periodic Table containing main group elements is shown.Which bond would be least polar?

Accepted Answer

A) WX 
B) YZ 
C) WZ 
D) WY 
E) cannot be determined without more specific information 
A) WX 
B) YZ 
C) WZ 
D) WY 
E) cannot be determined without more specific information

Question 3

A molecule in which the central atom forms one double bond and two single bonds is said to have a ________ shape.

Accepted Answer

A) bent 
B) linear 
C) trigonal planar 
D) pyramidal 
E) tetrahedral 
A) bent 
B) linear 
C) trigonal planar 
D) pyramidal 
E) tetrahedral

Question 4

Match the following.
-carbon monoxide

Accepted Answer

A) ICl 
B) C   
C) N   
D) PC   
E)     
F)CO
G)S  
H)S  
I)O  
J)Br  
K)CC  
L)I   
A) ICl 
B) C   
C) N   
D) PC   
E)     
F)CO
G)S  
H)S  
I)O  
J)Br  
K)CC  
L)I

Question 5

A chemical bond formed when two atoms share two pairs of electrons is a ________ bond;it is best described as ________.

Accepted Answer

A) double;covalent 
B) double;ionic 
C) single;covalent 
D) single;ionic 
E) triple;covalent 
A) double;covalent 
B) double;ionic 
C) single;covalent 
D) single;ionic 
E) triple;covalent

Question 6

The water molecule has a ________ geometry because its central atom has ________ bonds and ________ lone pairs of electrons.

Accepted Answer

A) bent;two;two 
B) linear;two;two 
C) pyramidal;three;one 
D) tetrahedral;four;zero 
E) planar triangular;three;one 
A) bent;two;two 
B) linear;two;two 
C) pyramidal;three;one 
D) tetrahedral;four;zero 
E) planar triangular;three;one

Question 7

Which property could describe a covalent compound?

Accepted Answer

A) It conducts electricity when melted. 
B) It is a gas at room temperature. 
C) It is composed of a non-metal and a metal. 
D) It conducts electricity when dissolved in water. 
E) none of the above 
A) It conducts electricity when melted. 
B) It is a gas at room temperature. 
C) It is composed of a non-metal and a metal. 
D) It conducts electricity when dissolved in water. 
E) none of the above

Question 8

Match the following.
-sulfur dioxide

Accepted Answer

A) ICl 
B) C   
C) N   
D) PC   
E)     
F)CO
G)S  
H)S  
I)O  
J)Br  
K)CC  
L)I   
A) ICl 
B) C   
C) N   
D) PC   
E)     
F)CO
G)S  
H)S  
I)O  
J)Br  
K)CC  
L)I

Question 9

A chemical bond formed when two atoms share six electrons is a ________ bond;it is best described as ________.

Accepted Answer

A) double;covalent 
B) double;ionic 
C) single;covalent 
D) single;ionic 
E) triple;covalent 
A) double;covalent 
B) double;ionic 
C) single;covalent 
D) single;ionic 
E) triple;covalent

Question 10

The formula for phosphorus pentafluoride is

Accepted Answer

A) PhF5. 
B) PF5. 
C) P5F. 
D) (PF)5. 
E) P5F5. 
A) PhF5. 
B) PF5. 
C) P5F. 
D) (PF)5. 
E) P5F5.

Question 11

A chemical bond formed when two atoms share three pairs of electrons is a ________ bond;it is best described as ________.

Accepted Answer

A) double;covalent 
B) single;covalent 
C) triple;covalent 
D) double;ionic 
E) triple;ionic 
A) double;covalent 
B) single;covalent 
C) triple;covalent 
D) double;ionic 
E) triple;ionic

Question 12

How many double bonds are there in a molecule of SF2?

Accepted Answer

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

Question 13

Draw the Lewis structure for CCl4.What is the molecular geometry of this compound? Is the molecule polar or nonpolar?

Accepted Answer

@#IMG-DLM& tetrahedr

Question 14

A molecule in which the central atom forms three single bonds and has one lone pair is said to have a ________ shape.

Accepted Answer

A) bent 
B) linear 
C) planar 
D) pyramidal 
E) tetrahedral 
A) bent 
B) linear 
C) planar 
D) pyramidal 
E) tetrahedral

Question 15

A chemical bond formed between two identical atoms is a(an)________ bond.

Accepted Answer

A) atomic 
B) covalent 
C) hydrogen 
D) ionic 
E) molecular 
A) atomic 
B) covalent 
C) hydrogen 
D) ionic 
E) molecular

Question 16

Which of the following molecules has a CCH bond angle of 180°?

Accepted Answer

A) HCCH 
B) H2CCH2 
C) H3CCH3 
D) H3CCHO 
E) none of them 
A) HCCH 
B) H2CCH2 
C) H3CCH3 
D) H3CCHO 
E) none of them

Question 17

The covalent bonding model is most useful in describing which of the following compounds?

Accepted Answer

A) CoCl2 
B) MgCl2 
C) NiCl2 
D) SCl2 
E) none of the above 
A) CoCl2 
B) MgCl2 
C) NiCl2 
D) SCl2 
E) none of the above

Question 18

Which element listed is the least electronegative?

Accepted Answer

A) nitrogen 
B) hydrogen 
C) oxygen 
D) fluorine 
E) chlorine 
A) nitrogen 
B) hydrogen 
C) oxygen 
D) fluorine 
E) chlorine

Question 19

Explain why it is unlikely that an organic molecule would have an odd number of valence electrons.

Accepted Answer

In most molecules,the Lewis dot structur

Question 20

Covalent compounds form distinct molecules,and therefore may exist as gases,liquids,or solids at room temperature,depending on the characteristics of the compound.

Accepted Answer

A) True 
 B)False

Exam 4: Molecular Compounds

The VSEPR model of molecular structure requires a knowledge of ________ to predict the geometry of an atom in a molecule.

A section of the Periodic Table containing main group elements is shown.Which bond would be least polar?

A molecule in which the central atom forms one double bond and two single bonds is said to have a ________ shape.

Match the following. -carbon monoxide

A chemical bond formed when two atoms share two pairs of electrons is a ________ bond;it is best described as ________.

The water molecule has a ________ geometry because its central atom has ________ bonds and ________ lone pairs of electrons.

Which property could describe a covalent compound?

Match the following. -sulfur dioxide

A chemical bond formed when two atoms share six electrons is a ________ bond;it is best described as ________.

The formula for phosphorus pentafluoride is

A chemical bond formed when two atoms share three pairs of electrons is a ________ bond;it is best described as ________.

How many double bonds are there in a molecule of SF2?

Draw the Lewis structure for CCl4.What is the molecular geometry of this compound? Is the molecule polar or nonpolar?

A molecule in which the central atom forms three single bonds and has one lone pair is said to have a ________ shape.

A chemical bond formed between two identical atoms is a(an)________ bond.

Which of the following molecules has a CCH bond angle of 180°?

The covalent bonding model is most useful in describing which of the following compounds?

Which element listed is the least electronegative?

Explain why it is unlikely that an organic molecule would have an odd number of valence electrons.

Covalent compounds form distinct molecules,and therefore may exist as gases,liquids,or solids at room temperature,depending on the characteristics of the compound.

Matter and Measurements

Atoms and the Periodic Table

Ionic Compounds

Classification and Balancing of Chemical Reactions

Chemical Reactions: Mole and Mass Relationships

Chemical Reactions: Energy, rates, and Equilibrium

Gases, liquids, and Solids

Solutions

Acids and Bases

Nuclear Chemistry

Introduction to Organic Chemistry: Alkanes

Alkenes, alkynes, and Aromatic Compounds

Some Compounds With Oxygen, sulfur, or a Halogen

Aldehydes and Ketones

Amines

Carboxylic Acids and Their Derivatives

Amino Acids and Proteins

Enzymes and Vitamins

Carbohydrates

The Generation of Biochemical Energy

Carbohydrate Metabolism

Lipids

Lipid Metabolism

Protein and Amino Acid Metabolism

Nucleic Acids and Protein Synthesis

Genomics

Chemical Messengers: Hormones, neurotransmitters, and Drugs

Body Fluids

Filters

A chemical bond formed when two atoms share two pairs of electrons is a bond;it is best described as .

The water molecule has a geometry because its central atom has bonds and lone pairs of electrons.

A chemical bond formed when two atoms share six electrons is a bond;it is best described as .

A chemical bond formed when two atoms share three pairs of electrons is a bond;it is best described as .

How many double bonds are there in a molecule of SF₂?

Draw the Lewis structure for CCl₄.What is the molecular geometry of this compound? Is the molecule polar or nonpolar?