Question 1

Which representation of a hydrogen molecule is not correct?

Accepted Answer

A) H=H 
B) H2 
C) H:H 
D) HH 
E) none of the above 
A) H=H 
B) H2 
C) H:H 
D) HH 
E) none of the above

Question 2

Match the following.
-phosphorus trichloride

Accepted Answer

A) OF2 
B) BrF5 
C) CCI4 
D) N2O4 
E) SF6
F)CO
G)ICl
H)SO2
I)CH4
J)IF7
K)PCI3
L)NH3 
A) OF2 
B) BrF5 
C) CCI4 
D) N2O4 
E) SF6
F)CO
G)ICl
H)SO2
I)CH4
J)IF7
K)PCI3
L)NH3

Question 3

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

Question 4

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 5

The compound BrF3 would be called

Accepted Answer

A) boron trifluoride. 
B) triboron fluoride. 
C) tri (bromine fluoride). 
D) tribromine fluoride. 
E) bromine trifluoride. 
A) boron trifluoride. 
B) triboron fluoride. 
C) tri (bromine fluoride). 
D) tribromine fluoride. 
E) bromine trifluoride.

Question 6

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 7

Consider the molecule SiCl4.The electronegativity values for Si and Cl are 1.8 and 3.0,respectively.Based on these values and on consideration of molecular geometry,the Si-Cl bond is ________ and the molecule is ________.

Accepted Answer

A) polar; polar 
B) nonpolar; nonpolar 
C) polar; nonpolar 
D) nonpolar; polar 
E) none of the above 
A) polar; polar 
B) nonpolar; nonpolar 
C) polar; nonpolar 
D) nonpolar; polar 
E) none of the above

Question 8

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 9

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 10

The formula for sulfur hexabromide is ________.

Accepted Answer

A) SF6 
B) SBr6 
C) SBr4 
D) SiBr6 
E) SiB6 
A) SF6 
B) SBr6 
C) SBr4 
D) SiBr6 
E) SiB6

Question 11

A chemical bond formed when two atoms share one pair 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 12

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 13

A molecule that contains three identical polar bonds to the central atom will be ________.

Accepted Answer

A) nonpolar if the geometry is planar triangular 
B) polar in all cases 
C) nonpolar in all cases 
D) impossible to tell the polarity 
E) either polar or nonpolar depending on the identity of the atoms bonded to the central atom 
A) nonpolar if the geometry is planar triangular 
B) polar in all cases 
C) nonpolar in all cases 
D) impossible to tell the polarity 
E) either polar or nonpolar depending on the identity of the atoms bonded to the central atom

Question 14

The number of valence electrons in the acetic acid molecule (CH3CO2H)is ________.

Accepted Answer

A) 0 
B) 8 
C) 16 
D) 24 
E) 32 
A) 0 
B) 8 
C) 16 
D) 24 
E) 32

Question 15

A triple bond involves the sharing of ________ pairs of electrons between the atoms

Accepted Answer

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

Exam 4: Molecular Compounds

Which representation of a hydrogen molecule is not correct?

Match the following. -phosphorus trichloride

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

Which element listed is the least electronegative?

The compound BrF3 would be called

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

Consider the molecule SiCl4.The electronegativity values for Si and Cl are 1.8 and 3.0,respectively.Based on these values and on consideration of molecular geometry,the Si-Cl bond is ________ and the molecule is ________.

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

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

The formula for sulfur hexabromide is ________.

A chemical bond formed when two atoms share one pair of 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 ________.

A molecule that contains three identical polar bonds to the central atom will be ________.

The number of valence electrons in the acetic acid molecule (CH3CO2H)is ________.

A triple bond involves the sharing of ________ pairs of electrons between the atoms

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

Amines

Aldehydes and Ketones

Carboxylic Acids and Their Derivatives

Amino Acids and Proteins

Enzymes and Vitamins

The Generation of Biochemical Energy

Carbohydrates

Carbohydrate Metabolism

Lipids

Lipid Metabolism

Nucleic Acids and Protein Synthesis

Genomics

Protein and Amino Acid Metabolism

Chemical Messengers: Hormones, neurotransmitters, and Drugs

Body Fluids

Filters

The compound BrF₃ would be called

Consider the molecule SiCl₄.The electronegativity values for Si and Cl are 1.8 and 3.0,respectively.Based on these values and on consideration of molecular geometry,the Si-Cl bond is and the molecule is .

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

A chemical bond formed when two atoms share one pair of 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 .

The number of valence electrons in the acetic acid molecule (CH₃CO₂H)is ________.