Question 1

Consider the set of compounds, NH3, HF, and H2O. Rank these compounds in order of increasing acidity and discuss your rationale.

Accepted Answer

NH₃ < H₂O < HF When determining relative a

Question 2

Use the curved arrow formalism to indicate the movement of electron pairs in the following reaction.

Accepted Answer

The answer of Use the curved arrow formalism to indicate...

Question 3

Add the appropriate formal charge to each atom in the molecule below. It is not necessary to indicate formal charges when zero.

Accepted Answer

The answer of Add the appropriate formal charge to each...

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

An oxygen atom has ________ valence electrons.

Accepted Answer

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

Question 6

Add the appropriate formal charge to each atom in the molecule below. It is not necessary to indicate formal charges when zero.

Accepted Answer

The answer of Add the appropriate formal charge to each...

Question 7

Methanesulfonic acid, CH3SO3H, has a pKa of -7 while ethanol, CH3CH2OH, has a pKa of 15.9. Which is the stronger acid and what accounts for this large difference in relative acidity?

Accepted Answer

Methanesulfonic acid is the stronger aci

Question 8

A node is a region of high electron density between the two atoms in a covalent bond.

Accepted Answer

A) True 
 B)False

Question 9

Draw a proper Lewis structure for H2SO4.

Accepted Answer

Question 10

Provide the Lewis structure of the conjugate acid of ethanol (CH3CH2OH).

Accepted Answer

Question 11

The Ka of formic acid is 1.7 x 10-4. The pKa of formic acid is ________.

Accepted Answer

A)  1.70 
B)  4.00 
C)  -2.36 
D)  3.77 
E)  10.38 
A)  1.70 
B)  4.00 
C)  -2.36 
D)  3.77 
E)  10.38

Question 12

Draw the important resonance forms of:

Accepted Answer

The answer of Draw the important resonance forms of: ...

Question 13

Draw the complete Lewis structure for the compound whose condensed formula is (CH3)2CHCHO.

Accepted Answer

Question 14

Calculate the pH of a 250 mL aqueous solution which contains 0.70 g of HCl.

Accepted Answer

The answer of Calculate the pH of a 250 mL...

Question 15

Which is more acidic, methanesulfonic acid (CH3SO3H) or propanoic acid (CH3CH2CO2H)? Explain.

Accepted Answer

Methansulfonic acid is considerably more

Question 16

Draw a complete Lewis structure, including lone pairs, for (CH3)2CHCO2H.

Accepted Answer

Question 17

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

Accepted Answer

A) True 
 B)False

Question 18

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

Accepted Answer

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

Question 19

Calculate the molecular formula for the organic compound whose quantitative elemental analysis showed 48.6% caron and 8.1% hydrogen by weight.

Accepted Answer

A)  CH2O 
B)  C2H4O2 
C)  C2H6 
D)  C3H6O 
E)  C3H6O2 
A)  CH2O 
B)  C2H4O2 
C)  C2H6 
D)  C3H6O 
E)  C3H6O2

Question 20

Draw the important resonance forms for the structure shown below.

Accepted Answer

The answer of Draw the important resonance forms for the...

Exam 1: Introduction and Review

Consider the set of compounds, NH3, HF, and H2O. Rank these compounds in order of increasing acidity and discuss your rationale.

Use the curved arrow formalism to indicate the movement of electron pairs in the following reaction.

Add the appropriate formal charge to each atom in the molecule below. It is not necessary to indicate formal charges when zero.

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

An oxygen atom has ________ valence electrons.

Add the appropriate formal charge to each atom in the molecule below. It is not necessary to indicate formal charges when zero.

Methanesulfonic acid, CH3SO3H, has a pKa of -7 while ethanol, CH3CH2OH, has a pKa of 15.9. Which is the stronger acid and what accounts for this large difference in relative acidity?

A node is a region of high electron density between the two atoms in a covalent bond.

Draw a proper Lewis structure for H2SO4.

Provide the Lewis structure of the conjugate acid of ethanol (CH3CH2OH).

The Ka of formic acid is 1.7 x 10-4. The pKa of formic acid is ________.

Draw the important resonance forms of:

Draw the complete Lewis structure for the compound whose condensed formula is (CH3)2CHCHO.

Calculate the pH of a 250 mL aqueous solution which contains 0.70 g of HCl.

Which is more acidic, methanesulfonic acid (CH3SO3H) or propanoic acid (CH3CH2CO2H)? Explain.

Draw a complete Lewis structure, including lone pairs, for (CH3)2CHCO2H.

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

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

Calculate the molecular formula for the organic compound whose quantitative elemental analysis showed 48.6% caron and 8.1% hydrogen by weight.

Draw the important resonance forms for the structure shown below.

Structure and Properties of Organic Molecules

Structure and Stereochemistry of Alkanes

The Study of Chemical Reactions

Stereochemistry

Alkyl Halides: Nucleophilic Substitution and Elimination

Structure and Synthesis of Alkenes

Reactions of Alkenes

Alkynes

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

Consider the set of compounds, NH₃, HF, and H₂O. Rank these compounds in order of increasing acidity and discuss your rationale.

Methanesulfonic acid, CH₃SO₃H, has a pKa of -7 while ethanol, CH₃CH₂OH, has a pKa of 15.9. Which is the stronger acid and what accounts for this large difference in relative acidity?

Draw a proper Lewis structure for H₂SO₄.

Provide the Lewis structure of the conjugate acid of ethanol (CH₃CH₂OH).

The Ka of formic acid is 1.7 x 10^-4. The pKa of formic acid is ________.

Draw the complete Lewis structure for the compound whose condensed formula is (CH₃)₂CHCHO.

Which is more acidic, methanesulfonic acid (CH₃SO₃H) or propanoic acid (CH₃CH₂CO₂H)? Explain.

Draw a complete Lewis structure, including lone pairs, for (CH₃)₂CHCO₂H.