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Ch.10 - Chemical Bonding I: The Lewis Model
Tro - Chemistry: A Molecular Approach 6th Edition
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Tutti i libri di testoTro 6th EditionCh.10 - Chemical Bonding I: The Lewis ModelProblema 86
Capitolo 10, Problema 86

Which of the two compounds, H2NNH2 and HNNH, has the strongest nitrogen-nitrogen bond, and which has the shorter nitrogen-nitrogen bond.

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Step 1: Identify the type of bonds in each compound. In H2NNH2, the nitrogen atoms are connected by a single bond. In HNNH, the nitrogen atoms are connected by a triple bond.
Step 2: Understand the relationship between bond strength and bond length. Generally, the stronger the bond, the shorter the bond length. This is because stronger bonds pull the atoms closer together.
Step 3: Apply this understanding to the compounds in question. The triple bond in HNNH is stronger than the single bond in H2NNH2, so HNNH has the stronger nitrogen-nitrogen bond.
Step 4: Similarly, because the bond in HNNH is stronger, it is also shorter. Therefore, HNNH has the shorter nitrogen-nitrogen bond.
Step 5: In conclusion, HNNH has both the stronger and the shorter nitrogen-nitrogen bond compared to H2NNH2.

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Covalent Bonding

Covalent bonding occurs when two atoms share electrons to achieve a full outer shell, leading to the formation of molecules. The strength of a covalent bond is influenced by factors such as the number of shared electron pairs and the electronegativity of the atoms involved. In the case of nitrogen-nitrogen bonds, the presence of lone pairs and the overall molecular structure can significantly affect bond strength.
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Chemical Bonds

Bond Length

Bond length is the distance between the nuclei of two bonded atoms. It is influenced by the size of the atoms and the type of bond formed. Generally, shorter bonds are stronger due to the increased overlap of atomic orbitals, which leads to a more stable interaction. In nitrogen compounds, variations in hybridization and steric effects can alter bond lengths.
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Average Bond Order

Resonance Structures

Resonance structures are different ways of drawing a molecule that can represent the same arrangement of atoms but differ in the distribution of electrons. These structures help explain the delocalization of electrons in molecules, which can affect bond strength and length. In compounds like H2NNH2 and HNNH, resonance can influence the nitrogen-nitrogen bond characteristics, leading to variations in stability and bond properties.
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