Question 1

Calculate the empirical and molecular formulas of the compound with molecular weight 122 and an elemental analysis of 59.01% C, 4.97% H, 13.12% O, and 22.90% N.

Accepted Answer

Empirical and molecu

Question 2

Nitroamines are common functional groups found in energetic materials, such as RDX and HMX. For the structure below, draw two other significant resonance structures, include any formal charges, and indicate the hybridization on each nitrogen and oxygen.

Accepted Answer

All nitrog

Question 3

In a carbon atom, the 2s and 2p orbitals are the same energy.

Accepted Answer

A) True 
 B)False

Question 4

In the following acid/base reaction, label the acid, base, conjugate acid and conjugate base.
NH3 + H- → NH2- + H2

Accepted Answer

Question 5

In the reaction below, label each reactant as a nucleophile or an electrophile.
CH3COO- + O2S(OCH3)2 → CH3COOCH3 + CH3OSO3-

Accepted Answer

CH₃COO^-, nuc

Question 6

One or more of the atoms in the structure shown should have nonzero formal charges. Redraw the structure and the atoms with non-zero formal charges.

Accepted Answer

The answer of One or more of the atoms in...

Question 7

Strong bases usually contain positively charged atoms of high electronegativity and no resonance stabilization.

Accepted Answer

A) True 
 B)False

Question 8

Within a given row of the periodic table, electronegativity typically increases left to right across the row.

Accepted Answer

A) True 
 B)False

Question 9

How many distinct p orbitals exist in the second electron shell, where n = 2?

Accepted Answer

A)  2 
B)  3 
C)  4 
D)  5 
E)  6 
A)  2 
B)  3 
C)  4 
D)  5 
E)  6

Question 10

What is the molecular formula for the following line-angle structure?

Accepted Answer

The answer of What is the molecular formula for the...

Question 11

One or more of the atoms in the structure shown should have nonzero formal charges. Add the correct formal charge/s. (All non-bonding electrons have been included.)

Accepted Answer

The answer of One or more of the atoms in...

Question 12

For most compounds in which a nitrogen atom bears no formal charge, the valence of this nitrogen atom is ________.

Accepted Answer

The answer of For most compounds in which a nitrogen...

Question 13

Which of the following pairs of bases lists the stronger base first?

Accepted Answer

A)  I- > Cl- 
B)  H2O > HO- 
C)  HO- > H2N- 
D)  CH3COO- > HO- 
E)  H2N- > CH3COO- 
A)  I- > Cl- 
B)  H2O > HO- 
C)  HO- > H2N- 
D)  CH3COO- > HO- 
E)  H2N- > CH3COO-

Question 14

Which sequence correctly ranks the following protons in order of increasing pKa value?

Accepted Answer

A)  3<1<2 
B)  2<1<3 
C)  3<2<1 
D)  1<3<2 
A)  3<1<2 
B)  2<1<3 
C)  3<2<1 
D)  1<3<2

Question 15

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

Accepted Answer

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

Question 16

Draw a correct Lewis structure for tert-butyl alcohol, (CH3)3COH, including all non-bonding lone pairs.

Accepted Answer

Question 17

Write a Lewis structure for a compound with the molecular formula H2N2.

Accepted Answer

Question 18

The electron density of ________ orbitals has spherical symmetry.

Accepted Answer

The answer of The electron density of ________ orbitals has...

Question 19

A condensed structure for acetone is CH3COCH3. Provide the structural formula for acetone.

Accepted Answer

Question 20

An oxygen atom has ________ valence electrons.

Accepted Answer

The answer of An oxygen atom has ________ valence electrons....

Exam 1: Structure and Bonding

Calculate the empirical and molecular formulas of the compound with molecular weight 122 and an elemental analysis of 59.01% C, 4.97% H, 13.12% O, and 22.90% N.

Nitroamines are common functional groups found in energetic materials, such as RDX and HMX. For the structure below, draw two other significant resonance structures, include any formal charges, and indicate the hybridization on each nitrogen and oxygen.

In a carbon atom, the 2s and 2p orbitals are the same energy.

In the following acid/base reaction, label the acid, base, conjugate acid and conjugate base. NH3 + H- → NH2- + H2

In the reaction below, label each reactant as a nucleophile or an electrophile. CH3COO- + O2S(OCH3)2 → CH3COOCH3 + CH3OSO3-

One or more of the atoms in the structure shown should have nonzero formal charges. Redraw the structure and the atoms with non-zero formal charges.

Strong bases usually contain positively charged atoms of high electronegativity and no resonance stabilization.

Within a given row of the periodic table, electronegativity typically increases left to right across the row.

How many distinct p orbitals exist in the second electron shell, where n = 2?

What is the molecular formula for the following line-angle structure?

One or more of the atoms in the structure shown should have nonzero formal charges. Add the correct formal charge/s. (All non-bonding electrons have been included.)

For most compounds in which a nitrogen atom bears no formal charge, the valence of this nitrogen atom is ________.

Which of the following pairs of bases lists the stronger base first?

Which sequence correctly ranks the following protons in order of increasing pKa value?

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

Draw a correct Lewis structure for tert-butyl alcohol, (CH3)3COH, including all non-bonding lone pairs.

Write a Lewis structure for a compound with the molecular formula H2N2.

The electron density of ________ orbitals has spherical symmetry.

A condensed structure for acetone is CH3COCH3. Provide the structural formula for acetone.

An oxygen atom has ________ valence electrons.

Acids and Bases; Functional Groups

Structure and Stereochemistry of Alkanes

The Study of Chemical Reactions

Stereochemistry

Alkyl Halides; Nucleophilic Substitution

Structure and Synthesis of Alkenes; Elimination

Reactions of Alkenes

Structure and Synthesis of Alcohols

Reactions of Alcohols

Infrared Spectroscopy and Mass Spectrometry

Nuclear Magnetic Resonance Spectroscopy

Ethers, Epoxides, and Thioethers

Conjugated Systems, Orbital Symmetry, and Ultraviolet Spectroscopy

Aromatic Compounds

Reactions of Aromatic Compounds

Ketones and Aldehydes

Amines

Carboxylic Acids

Carboxylic Acid Derivatives

Condensations and Alpha Substitutions of Carboxyl Compounds

Carbohydrates and Nucleic Acids

Amino Acids, Peptides, and Proteins

Lipids

Synthetic Polymers

Filters

In the following acid/base reaction, label the acid, base, conjugate acid and conjugate base. NH₃ + H^- → NH₂^- + H₂

In the reaction below, label each reactant as a nucleophile or an electrophile. CH₃COO^- + O₂S(OCH₃)₂ → CH₃COOCH₃ + CH₃OSO₃^-

Which sequence correctly ranks the following protons in order of increasing pK_a value?

Draw a correct Lewis structure for tert-butyl alcohol, (CH₃)₃COH, including all non-bonding lone pairs.

Write a Lewis structure for a compound with the molecular formula H₂N₂.

A condensed structure for acetone is CH₃COCH₃. Provide the structural formula for acetone.