Question 1

Which of the following statements correctly describes the third electron shell that surrounds the nucleus of an atom?

Accepted Answer

A) The third shell contains only s and p atomic orbitals. 
B) The maximum number of electrons that can occupy the third shell is 18. 
C) The total number of atomic orbitals present in the third shell is 16. 
D) The third shell can contain f orbitals. 
E) All third shell elements must have d electrons. 
A) The third shell contains only s and p atomic orbitals. 
B) The maximum number of electrons that can occupy the third shell is 18. 
C) The total number of atomic orbitals present in the third shell is 16. 
D) The third shell can contain f orbitals. 
E) All third shell elements must have d electrons. B

Question 2

Draw the Kekulé structure and show the direction of the dipole moment for CH2Cl2.

Accepted Answer

Question 3

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

Accepted Answer

3p orbital

Question 4

What kind of molecular orbital (σ, σ*, π, or π*)results when the two atomic orbitals shown below interact in the manner indicated?

Accepted Answer

The answer of What kind of molecular orbital (σ, σ*,...

Question 5

Draw the Lewis structure for CH3N2+.

Accepted Answer

Question 6

Draw condensed structures for the four compounds with formula C3H9N.

Accepted Answer

CH₃CH₂CH₂NH₂ C

Question 7

Triethylamine [(CH3CH2)3N] is a molecule in which the nitrogen atom is ________ hybridized and the CNC bond angle is ________.

Accepted Answer

A) sp2, >109.5° B) sp2, 3, >109.5° D) sp3, <109.5° E) sp, 109.5° A) sp2, >109.5° B) sp2, 3, >109.5° D) sp3, <109.5° E) sp, 109.5°

Question 8

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 9

Identify the compound(s)that have a nonzero dipole moment.

Accepted Answer

A) CH3NH2 
B) CO2 
C) CH3OCH3 
D) (CH3)2C   C(CH3)2 
E) BCl3 
A) CH3NH2 
B) CO2 
C) CH3OCH3 
D) (CH3)2C   C(CH3)2 
E) BCl3

Question 10

The N-H single bond in methyl amine (CH3NH2)is a ________ bond formed by the overlap of a(n)________ orbital on N and a(n)________ orbital on H.

Accepted Answer

A) σ; sp2; s 
B) σ ; sp3; s 
C) π ; sp3; s 
D) π ; sp2; p 
E) π ; p ; p 
A) σ; sp2; s 
B) σ ; sp3; s 
C) π ; sp3; s 
D) π ; sp2; p 
E) π ; p ; p

Question 11

Atoms with the same number of protons but different numbers of neutrons are called ________.

Accepted Answer

The answer of Atoms with the same number of protons...

Question 12

Draw the shape of a 2p orbital.

Accepted Answer

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

Question 13

How many sp2 hybridized carbons are present in allene (H2C=C=CH2)?

Accepted Answer

A) 0 
B) 1 
C) 1)5 
D) 2 
E) 3 
A) 0 
B) 1 
C) 1)5 
D) 2 
E) 3

Question 14

Give the H-C-H bond angle in H2CO.

Accepted Answer

A) 60 
B) 90 
C) 109.5 
D) 120 
E) 180 
A) 60 
B) 90 
C) 109.5 
D) 120 
E) 180

Question 15

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 16

Which of the following molecules does not exhibit a net dipole moment of zero?

Accepted Answer

A) CO2 
B) CH4 
C) CCl4 
D) H2O 
E) SO3 
A) CO2 
B) CH4 
C) CCl4 
D) H2O 
E) SO3

Question 17

The hydrogen-halogen bond becomes ________ and ________ as the size (atomic weight)of the halogen increases.

Accepted Answer

A) longer, weaker 
B) longer, stronger 
C) shorter, weaker 
D) shorter, stronger 
A) longer, weaker 
B) longer, stronger 
C) shorter, weaker 
D) shorter, stronger

Question 18

Give the electronic configuration for N-3.

Accepted Answer

A) 1s22s2 
B) 1s22s22p3 
C) 1s22s22p4 
D) 1s22s22p6 
E) 1s22s22p63s1 
A) 1s22s2 
B) 1s22s22p3 
C) 1s22s22p4 
D) 1s22s22p6 
E) 1s22s22p63s1

Question 19

Consider the interaction of two hydrogen 1s atomic orbitals of the same phase. Which of the statements below is an incorrect description of this interaction?

Accepted Answer

A) A sigma bonding molecular orbital is formed. 
B) The molecular orbital formed is lower in energy than a hydrogen 1s atomic orbital. 
C) The molecular orbital formed has a node between the atoms. 
D) The molecular orbital formed is cylindrically symmetric. 
E) A maximum of two electrons may occupy the molecular orbital formed. 
A) A sigma bonding molecular orbital is formed. 
B) The molecular orbital formed is lower in energy than a hydrogen 1s atomic orbital. 
C) The molecular orbital formed has a node between the atoms. 
D) The molecular orbital formed is cylindrically symmetric. 
E) A maximum of two electrons may occupy the molecular orbital formed.

Question 20

What are the formal charges on nitrogen and the starred oxygen atom in the following molecule?

Accepted Answer

A) N = -1, O = 0 
B) N = +1, O = -1 
C) N = +1, O = +1 
D) N = -1, O = -1 
E) N= +1, O = 0 
A) N = -1, O = 0 
B) N = +1, O = -1 
C) N = +1, O = +1 
D) N = -1, O = -1 
E) N= +1, O = 0

Exam 1: Remembering General Chemistry: Electronic Structure and Bonding

Which of the following statements correctly describes the third electron shell that surrounds the nucleus of an atom?

Draw the Kekulé structure and show the direction of the dipole moment for CH2Cl2.

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

What kind of molecular orbital (σ, σ*, π, or π*)results when the two atomic orbitals shown below interact in the manner indicated?

Draw the Lewis structure for CH3N2+.

Draw condensed structures for the four compounds with formula C3H9N.

Triethylamine [(CH3CH2)3N] is a molecule in which the nitrogen atom is ________ hybridized and the CNC bond angle is ________.

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

Identify the compound(s)that have a nonzero dipole moment.

The N-H single bond in methyl amine (CH3NH2)is a ________ bond formed by the overlap of a(n)________ orbital on N and a(n)________ orbital on H.

Atoms with the same number of protons but different numbers of neutrons are called ________.

Draw the shape of a 2p orbital.

How many sp2 hybridized carbons are present in allene (H2C=C=CH2)?

Give the H-C-H bond angle in H2CO.

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

Which of the following molecules does not exhibit a net dipole moment of zero?

The hydrogen-halogen bond becomes ________ and ________ as the size (atomic weight)of the halogen increases.

Give the electronic configuration for N-3.

Consider the interaction of two hydrogen 1s atomic orbitals of the same phase. Which of the statements below is an incorrect description of this interaction?

What are the formal charges on nitrogen and the starred oxygen atom in the following molecule?

Acids and Bases: Central to Understanding Organic Chemistry

An Introduction to Organic Compounds

Isomers: the Arrangement of Atoms in Space

Alkenes Thermodynamics and Kinetics

Reactions of Alkenes

Reactions of Alkynes Introduction to Multistep Synthesis

Electron Delocalization, Resonance, and Aromaticity More About Molecular Orbital Theory

Substitution Reactions of Alkyl Halides

Elimination Reactions of Alkyl Halides Competition Between Substitution and Elimination

Reactions of Alcohols, Ethers, Epoxides, and Sulfur-Containing Compounds

Organometallic Compounds

Reactions of Alkanes, 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 Alpha Carbon of Carbonyl Compounds

Reactions of Benzene and Substituted Benzenes

More About Amines Heterocylic Compounds

Carbohydrates

Amino Acids, Peptides, and Proteins

Catalysis

The Organic Mechanisms of the Coenzymes

The Chemistry of Metabolism

Nucleosides, Nucleotides, and Nucleic Acids

Synthetic Polymers

Pericyclic Reactions

Filters

Draw the Kekulé structure and show the direction of the dipole moment for CH₂Cl₂.

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

What kind of molecular orbital (σ, σ, π, or π)results when the two atomic orbitals shown below interact in the manner indicated?

Draw the Lewis structure for CH₃N₂⁺.

Draw condensed structures for the four compounds with formula C₃H₉N.

Triethylamine [(CH₃CH₂)₃N] is a molecule in which the nitrogen atom is hybridized and the CNC bond angle is .

The N-H single bond in methyl amine (CH₃NH₂)is a bond formed by the overlap of a(n) orbital on N and a(n) orbital on H.

How many sp² hybridized carbons are present in allene (H₂C=C=CH₂)?

Give the H-C-H bond angle in H₂CO.

The hydrogen-halogen bond becomes and as the size (atomic weight)of the halogen increases.

Give the electronic configuration for N^-3.