Question 1

Draw the Lewis structure for the molecule CH₃CH₂CCH. How many sigma and pi bonds does it contain?

Accepted Answer

To draw the Lewis structure, we need to first count the valence electrons. There are 16 carbons, 27 hydrogens, and 2 sulfurs, so we have a total of 2(6) + 27(1) + 2(6) = 47 valence electrons.

Next, we can start arranging the atoms, starting with the central carbon. We then add the atoms one by one, ensuring that each atom has a full octet. After arranging all the atoms, we end up with a long linear chain with alternating single and triple bonds.

Counting the bonds, we have 9 sigma bonds (single bonds) and 2 pi bonds (triple bonds) in the molecule. Therefore, the answer is D.

Question 2

How many of the following molecules have sp hybridization on the central atom? C₂Cl₂ CO₂ O₃ H₂O

Accepted Answer

The answer of How many of the following molecules have...

Question 3

Use the molecular orbital diagram shown to determine which of the following is most stable.

Accepted Answer

The answer of Use the molecular orbital diagram shown to...

Question 4

List the number of sigma bonds and pi bonds in a triple bond.

Accepted Answer

A triple bond consists of one sigma bond and two pi bonds.

Question 5

List the number of sigma bonds and pi bonds in a single bond.

Accepted Answer

A single bond consists of one sigma bond and no pi bonds.

Question 6

Use the molecular orbital diagram shown to determine which of the following is most stable.

Accepted Answer

The answer of Use the molecular orbital diagram shown to...

Question 7

Give the electron geometry (eg), molecular geometry (mg), and hybridization for CH₃^-.

Accepted Answer

The CH₃^- ion has four regions of electron density around the central carbon atom, leading to a tetrahedral electron geometry. However, with one lone pair, the molecular geometry is trigonal pyramidal. The hybridization is sp³.

Question 8

How many of the following molecules contain at least one pi bond? C₂H₆ Cl₂CO C₂Cl₄ SeS₃

Accepted Answer

The answer of How many of the following molecules contain...

Question 9

Use the molecular orbital diagram shown to determine which of the following is least stable.

Accepted Answer

The answer of Use the molecular orbital diagram shown to...

Question 10

Draw the Lewis structure for the molecule CH₂CHCH₃. How many sigma and pi bonds does it contain?

Accepted Answer

The answer of Draw the Lewis structure for the molecule...

Question 11

How many of the following molecules have sp³ hybridization on the central atom? XeCl₄ CH₄ SF₄ C₂H₂

Accepted Answer

The answer of How many of the following molecules have...

Question 12

Draw the Lewis structure for the molecule C₃H₄. How many sigma and pi bonds does it contain?

Accepted Answer

To draw the Lewis structure, we first need to count the total number of valence electrons:
C = 4
S = 6 each (there are two of them)
H = 1
B = 3 each (there are two of them)
U = 6 each (there are four of them)
O = 8
Total = 44

We can arrange these atoms to form:

H                  H
    |                  | 
C==S                S==C
  // \                / \
B   U13             U14  B
|   |                |   |
U12 U11             U9  U10
   /                  \
  O                    O

Each line represents a bond, and each pair of electrons in a bond is a sigma bond. Pi bonds occur in double and triple bonds, where the second or third bonding pair of electrons is in a p orbital perpendicular to the sigma bond. In this case, there are two pi bonds in the C=S bonds, for a total of 6 sigma bonds and 2 pi bonds. Therefore, the answer is C) 6 sigma, 2 pi.

Question 13

Use the molecular orbital diagram shown to determine which of the following is least stable.

Accepted Answer

The molecule with an extra electron (option E) is the least stable because it fills the previously empty antibonding π* orbital, which destabilizes the molecule. The other options do not have this electron filling an antibonding orbital.

Question 14

Consider the following compound. How many sigma and pi bonds does it contain? CH₃CHCHCO₂H

Accepted Answer

The answer of Consider the following compound. How many sigma...

Question 15

How many of the following molecules have sp² hybridization on the central atom? HCN SO₂ OCl₂ XeCl₂

Accepted Answer

HCN has sp hybridization on the central carbon atom, as it forms a triple bond with nitrogen and a single bond with hydrogen, resulting in two sigma bonds and no lone pairs, fitting the sp hybridization model. SOS, OCl, and XeCl do not exist in forms with sp hybridization on the central atom; they either do not form stable molecules with the given stoichiometry or would have different hybridization states based on their electron pair geometry.

Question 16

Use the molecular orbital diagram shown to determine which of the following is paramagnetic.

Accepted Answer

The answer of Use the molecular orbital diagram shown to...

Question 17

Draw a molecular orbital diagram and use it to determine which of the following is most stable.

Accepted Answer

O₂²⁺ has the highest bond order, indicating greater stability compared to the other species.

Question 18

Which of the following statements is TRUE?

Accepted Answer

When two atomic orbitals combine, they form one bonding molecular orbital (lower in energy) and one antibonding molecular orbital (higher in energy).

Question 19

List the number of sigma bonds and pi bonds in a double bond.

Accepted Answer

A double bond consists of one sigma bond and one pi bond. The sigma bond is formed by the head-on overlap of orbitals, while the pi bond is formed by the side-to-side overlap of p orbitals.

Question 20

Use the molecular orbital diagram shown to determine which of the following is paramagnetic.

Accepted Answer

The answer of Use the molecular orbital diagram shown to...

Quiz 10: Chemical Bonding Ii: Molecular Shapes, Valence Bond Theory, and Molecular Orbital Theory

Draw the Lewis structure for the molecule CH₃CH₂CCH. How many sigma and pi bonds does it contain?

How many of the following molecules have sp hybridization on the central atom? C₂Cl₂ CO₂ O₃ H₂O

Use the molecular orbital diagram shown to determine which of the following is most stable.

List the number of sigma bonds and pi bonds in a triple bond.

List the number of sigma bonds and pi bonds in a single bond.

Use the molecular orbital diagram shown to determine which of the following is most stable.

Give the electron geometry (eg) , molecular geometry (mg) , and hybridization for CH₃^-.

How many of the following molecules contain at least one pi bond? C₂H₆ Cl₂CO C₂Cl₄ SeS₃

Use the molecular orbital diagram shown to determine which of the following is least stable.

Draw the Lewis structure for the molecule CH₂CHCH₃. How many sigma and pi bonds does it contain?

How many of the following molecules have sp³ hybridization on the central atom? XeCl₄ CH₄ SF₄ C₂H₂

Draw the Lewis structure for the molecule C₃H₄. How many sigma and pi bonds does it contain?

Use the molecular orbital diagram shown to determine which of the following is least stable.

Consider the following compound. How many sigma and pi bonds does it contain? CH₃CHCHCO₂H

How many of the following molecules have sp² hybridization on the central atom? HCN SO₂ OCl₂ XeCl₂

Use the molecular orbital diagram shown to determine which of the following is paramagnetic.

Draw a molecular orbital diagram and use it to determine which of the following is most stable.

Which of the following statements is TRUE?

List the number of sigma bonds and pi bonds in a double bond.

Use the molecular orbital diagram shown to determine which of the following is paramagnetic.

Quiz 10: Chemical Bonding Ii: Molecular Shapes, Valence Bond Theory, and Molecular Orbital Theory

Draw the Lewis structure for the molecule CH3CH2CCH. How many sigma and pi bonds does it contain?

How many of the following molecules have sp hybridization on the central atom? C2Cl2 CO2 O3 H2O

Use the molecular orbital diagram shown to determine which of the following is most stable.

List the number of sigma bonds and pi bonds in a triple bond.

List the number of sigma bonds and pi bonds in a single bond.

Use the molecular orbital diagram shown to determine which of the following is most stable.

Give the electron geometry (eg) , molecular geometry (mg) , and hybridization for CH3-.

How many of the following molecules contain at least one pi bond? C2H6 Cl2CO C2Cl4 SeS3

Use the molecular orbital diagram shown to determine which of the following is least stable.

Draw the Lewis structure for the molecule CH2CHCH3. How many sigma and pi bonds does it contain?

How many of the following molecules have sp3 hybridization on the central atom? XeCl4 CH4 SF4 C2H2

Draw the Lewis structure for the molecule C3H4. How many sigma and pi bonds does it contain?

Use the molecular orbital diagram shown to determine which of the following is least stable.

Consider the following compound. How many sigma and pi bonds does it contain? CH3CHCHCO2H

How many of the following molecules have sp2 hybridization on the central atom? HCN SO2 OCl2 XeCl2

Use the molecular orbital diagram shown to determine which of the following is paramagnetic.

Draw a molecular orbital diagram and use it to determine which of the following is most stable.

Which of the following statements is TRUE?

List the number of sigma bonds and pi bonds in a double bond.

Use the molecular orbital diagram shown to determine which of the following is paramagnetic.

Draw the Lewis structure for the molecule CH₃CH₂CCH. How many sigma and pi bonds does it contain?

How many of the following molecules have sp hybridization on the central atom? C₂Cl₂ CO₂ O₃ H₂O

Give the electron geometry (eg) , molecular geometry (mg) , and hybridization for CH₃^-.

How many of the following molecules contain at least one pi bond? C₂H₆ Cl₂CO C₂Cl₄ SeS₃

Draw the Lewis structure for the molecule CH₂CHCH₃. How many sigma and pi bonds does it contain?

How many of the following molecules have sp³ hybridization on the central atom? XeCl₄ CH₄ SF₄ C₂H₂

Draw the Lewis structure for the molecule C₃H₄. How many sigma and pi bonds does it contain?

Consider the following compound. How many sigma and pi bonds does it contain? CH₃CHCHCO₂H

How many of the following molecules have sp² hybridization on the central atom? HCN SO₂ OCl₂ XeCl₂