Chapter 9: Problem 47
Give the bond order for each bond in the following molecules or ions. (a) \(\mathrm{CH}_{2} \mathrm{O}\) (c) \(\mathrm{NO}_{2}^{+}\) (b) \(\mathrm{SO}_{3}^{2-}\) (d) NOCl
Short Answer
Expert verified
(a) 2; (b) 1.33; (c) 2; (d) N=O: 2, N-Cl: 1.
Step by step solution
01
Lewis Structure of Formaldehyde ( \mathrm{CH}_2\mathrm{O} )
Draw the Lewis structure for formaldehyde. Carbon forms a double bond with oxygen and single bonds with each hydrogen. The structure resembles: \( H_2C=O \).
02
Determine Bond Order in CH2O
In \( \mathrm{CH}_2\mathrm{O} \), there is one carbon-oxygen double bond. Therefore, the bond order is 2.
03
Lewis Structure of Nitronium Ion (\(\mathrm{NO}_2^+\))
Draw the Lewis structure for \( \mathrm{NO}_2^+ \). Nitrogen forms a double bond with each oxygen, and there are no lone pairs on nitrogen. The structure is linear.
04
Determine Bond Order in NO2+
In \( \mathrm{NO}_2^+ \), there are two equivalent \( \mathrm{N} = \mathrm{O} \) double bonds. The bond order is 2 for both \( \mathrm{N} = \mathrm{O} \) bonds.
05
Lewis Structure of Sulfite Ion (\(\mathrm{SO}_3^{2-}\))
Draw the Lewis structure for \( \mathrm{SO}_3^{2-} \). Sulfur is bonded to three oxygens with one double bond and two single bonds. Resonance structures indicate that each \( \mathrm{S} - \mathrm{O} \) bond is equivalent.
06
Determine Bond Order in SO32-
In \( \mathrm{SO}_3^{2-} \), average the one double and two single bonds over three bonds. The bond order is \( \frac{1+1+2}{3} = \frac{4}{3} \approx 1.33 \).
07
Lewis Structure of Nitrosyl Chloride (\(\mathrm{NOCl}\))
Draw the Lewis structure for \( \mathrm{NOCl} \). Nitrogen forms a double bond with oxygen and a single bond with chlorine.
08
Determine Bond Order in NOCl
In \( \mathrm{NOCl} \), the \( \mathrm{N} = \mathrm{O} \) bond order is 2, and the \( \mathrm{N} - \mathrm{Cl} \) bond order is 1.
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Lewis structures
Lewis structures are diagrams that represent the arrangement of electrons in a molecule. They help us understand the valence electrons and how atoms bond in a compound. By using dots to symbolize electrons, and lines to indicate convalent bonds, Lewis structures offer a visual representation of a molecule's atomic configuration.
To draw a Lewis structure:
To draw a Lewis structure:
- Count the total valence electrons available from all the atoms.
- Use lines to make single bonds between atoms.
- Complete the octet for outer atoms, and for the central atom if applicable.
- Apply double or triple bonds if needed to satisfy the octet rule.
covalent bonds
Covalent bonds are formed when two atoms share electrons to attain a full outer electron shell. This sharing allows each atom to achieve greater stability, similar to the nearest noble gas configuration. Covalent bonds are a fundamental aspect of how elements combine.
Key characteristics include:
Key characteristics include:
- Shared pairs of electrons between atoms.
- Bond strength is influenced by the number of shared pairs (single, double, or triple bonds).
- Covalent bonds can form between atoms of the same element or different elements.
- Nonmetals typically form covalent bonds.
chemical bonding
Chemical bonding involves the interaction between atoms that leads to the formation of molecules. It is a core concept in chemistry that explains how atoms come together.
There are various types of chemical bonding, including:
- Covalent bonds: Involves sharing of electron pairs.
- Ionic bonds: Transfer of electrons from one atom to another.
- Metallic bonds: Free movement of electrons within a metal lattice.
resonance structures
Resonance structures illustrate the different ways atoms can be arranged in a molecule without changing its overall connectivity. These structures highlight the delocalized movement of electrons.
Key aspects of resonance include:
- Resonance structures have the same arrangement of atoms but different distributions of electrons.
- The true structure of a molecule is a hybrid of its resonance forms.
- Resonance provides greater stability to a molecule, as electrons are spread over multiple atoms.
- Commonly seen in molecules with pi bonds and lone pairs.