Question 1

Which bond in the following molecule is the shortest?

Accepted Answer

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

Question 2

Why is the C-H bond in ethene (H2C   CH2)shorter and stronger than the C-H bond in ethane (CH3CH3)?

Accepted Answer

The length and strength of a C-H bond depends on the hybridization of the carbon atom.The more s character in the hybrid orbital used by carbon to form the bond,the shorter and stronger the bond.This is because an s orbital is closer to the nucleus than is a p.Ethene uses carbon sp² hybrid orbitals (1/3 s character)to make its carbon-hydrogen bonds while ethane uses carbon sp³ (1/4 s character).

Question 3

Using the symbol δ+ and δ-,show the direction of the polarity in the indicated bond.

Accepted Answer

The answer of Using the symbol δ+ and δ-,show the...

Question 4

Covalent bonds may be polar or nonpolar.What property of the atoms forming a given bond determines this?

Accepted Answer

The answer of Covalent bonds may be polar or nonpolar.What...

Question 5

Which of the following molecules has the smallest dipole moment?

Accepted Answer

A) Br2 
B) NH3 
C) HCl 
D) HBr 
E) HI 
A) Br2 
B) NH3 
C) HCl 
D) HBr 
E) HI

Question 6

Draw a Lewis structure for the molecule given and show all formal charges.
CH2CO

Accepted Answer

Question 7

Which of the following is an sp2 hybridized carbon?

Accepted Answer

A)    
B) ∙ CH3 
C)    
D) A and B 
E) A,B and C 
A)    
B) ∙ CH3 
C)    
D) A and B 
E) A,B and C

Question 8

Draw condensed structures for the four compounds with formula C3H9N.

Accepted Answer

CH₃CH₂CH₂NH₂ C

Question 9

Which of the following is the electronic configuration of the element Fe?

Accepted Answer

A) 1s2 2s2 2p6 3s2 3p6 4s2 3d6 
B) 1s2 2s2 2p6 3s2 3p8 3d6 
C) 1s2 2s2 2p8 3s2 3p6 4s2 3d6 
D) 1s2 2s2 2p6 3s2 3p6 4s2 4d6 
E) 1s2 2s2 2p6 3s2 3p6 4s2 4p6 
A) 1s2 2s2 2p6 3s2 3p6 4s2 3d6 
B) 1s2 2s2 2p6 3s2 3p8 3d6 
C) 1s2 2s2 2p8 3s2 3p6 4s2 3d6 
D) 1s2 2s2 2p6 3s2 3p6 4s2 4d6 
E) 1s2 2s2 2p6 3s2 3p6 4s2 4p6

Question 10

Identify the least electronegative atom.

Accepted Answer

A) P 
B) Na 
C) I 
D) B 
E) O 
A) P 
B) Na 
C) I 
D) B 
E) O

Question 11

Draw the shape of a 2p orbital.

Accepted Answer

The answer of Draw the shape of a 2p orbital....

Question 12

Ar,K+,Cl- are isoelectronic elements (elements with the same number of electrons).What orbital does the last electron occupy?

Accepted Answer

Question 13

Give the shape of the methyl radical.

Accepted Answer

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

Question 14

Determine the number of pi bonds in CH3CN.

Accepted Answer

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

Question 15

Identify the hybridization of the oxygen in CH3OCH3.

Accepted Answer

A) sp 
B) sp2 
C) sp3 
D) sp4 
E) sp5 
A) sp 
B) sp2 
C) sp3 
D) sp4 
E) sp5

Question 16

Give the number of nonbonding lone pairs of electrons in H2NOH.

Accepted Answer

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

Question 17

BF3 has a dipole moment of zero.Propose a structure for BF3 that is consistent with this information.

Accepted Answer

BF₃ is trig

Question 18

The Kekulé structure of pentane is shown below.Draw the condensed structural formula which corresponds to this Lewis structure.

Accepted Answer

The answer of The Kekulé structure of pentane is shown...

Question 19

What is the CNN bond angle in the compound shown below?

Accepted Answer

A) ~60° 
B) ~90° 
C) ~110° 
D) ~120° 
E) ~180° 
A) ~60° 
B) ~90° 
C) ~110° 
D) ~120° 
E) ~180°

Question 20

How many unpaired electrons are present in the isolated carbon atom (atomic number = 6)?

Accepted Answer

A) none 
B) one 
C) two 
D) three 
E) four 
A) none 
B) one 
C) two 
D) three 
E) four

Exam 1: Remembering General Chemistry: Electronic Structure and Bonding

Which bond in the following molecule is the shortest?

Why is the C-H bond in ethene (H2C CH2)shorter and stronger than the C-H bond in ethane (CH3CH3)?

Using the symbol δ+ and δ-,show the direction of the polarity in the indicated bond.

Covalent bonds may be polar or nonpolar.What property of the atoms forming a given bond determines this?

Which of the following molecules has the smallest dipole moment?

Draw a Lewis structure for the molecule given and show all formal charges. CH2CO

Which of the following is an sp2 hybridized carbon?

Draw condensed structures for the four compounds with formula C3H9N.

Which of the following is the electronic configuration of the element Fe?

Identify the least electronegative atom.

Draw the shape of a 2p orbital.

Ar,K+,Cl- are isoelectronic elements (elements with the same number of electrons).What orbital does the last electron occupy?

Give the shape of the methyl radical.

Determine the number of pi bonds in CH3CN.

Identify the hybridization of the oxygen in CH3OCH3.

Give the number of nonbonding lone pairs of electrons in H2NOH.

BF3 has a dipole moment of zero.Propose a structure for BF3 that is consistent with this information.

The Kekulé structure of pentane is shown below.Draw the condensed structural formula which corresponds to this Lewis structure.

What is the CNN bond angle in the compound shown below?

How many unpaired electrons are present in the isolated carbon atom (atomic number = 6)?

Acids and Bases: Central to Understanding Organic Chemistry

An Introduction to Organic Compounds: Nomenclature, physical Properties, and Structure

Isomers: the Arrangement of Atoms in Space

Alkenes: Structure,nomenclature,and an Introduction to Reactivity - Thermodynamics and Kinetics

The Reactions of Alkenes - the Stereochemistry of Addition Reactions

The Reactions of Alkynes - Introduction to Multistep Synthesis

Delocalized Electrons: Their Effect on Stability, pka, and the Products of a Reaction - Aromaticity and Electronic Effects: an Introduction to the Reactions of Benzene

Substitution and Elimination Reactions of Alkyl Halides

Reactions of Alcohols, ethers, epoxides, amines and Sulfur-Containing Compounds

Organometallic Compounds

Radicals

Mass Spectrometry,infrared Spectroscopy,and Uvvis Spectroscopy

Nmr Spectroscopy

Reactions of Carboxylic Acids and Carboxylic Acid Derivatives

Reactions of Aldehydes and Ketones

Reactions at the Α-Carbon

Reactions of Benzene and Substituted Benzenes

More About Amines - Reactions of Heterocylic Compounds

The Organic Chemistry of Carbohydrates

Amino Acids,peptides,and Proteins

Catalysis in Organic Reactions and in Enzymatic Reactions

The Organic Chemistry of the Coenzymes, compounds Derived From Vitamins

The Organic Chemistry of the Metabolic Pathways

The Organic Chemistry of Lipids

The Chemistry of the Nucleic Acids

Synthetic Polymers

Pericyclic Reactions

Filters

Why is the C-H bond in ethene (H₂C CH₂)shorter and stronger than the C-H bond in ethane (CH₃CH₃)?

Draw a Lewis structure for the molecule given and show all formal charges. CH₂CO

Which of the following is an sp² hybridized carbon?

Draw condensed structures for the four compounds with formula C₃H₉N.

Ar,K⁺,Cl^- are isoelectronic elements (elements with the same number of electrons).What orbital does the last electron occupy?

Determine the number of pi bonds in CH₃CN.

Identify the hybridization of the oxygen in CH₃OCH₃.

Give the number of nonbonding lone pairs of electrons in H₂NOH.

BF₃ has a dipole moment of zero.Propose a structure for BF₃ that is consistent with this information.