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Ch.8 - Basic Concepts of Chemical Bonding
Brown - Chemistry: The Central Science 14th Edition
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Tutti i libri di testoBrown 14th EditionCh.8 - Basic Concepts of Chemical BondingProblema 31a
Capitolo 8, Problema 31a

(a) State whether or not the bonding in each substance is likely to be covalent: (i) glucose, (ii) nitrogen, (iii) aluminum hydroxide, (iv) ammonia, (v) neon.

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To determine if the bonding in a substance is likely to be covalent, consider the types of elements involved. Covalent bonds typically form between nonmetals.
Examine glucose (C₆H₁₂O₆): Glucose is composed of carbon, hydrogen, and oxygen, all of which are nonmetals. Therefore, the bonding in glucose is likely covalent.
Consider nitrogen (N₂): Nitrogen is a diatomic molecule consisting of two nitrogen atoms, both nonmetals. The bonding in nitrogen is covalent.
Analyze aluminum hydroxide (Al(OH)₃): Aluminum is a metal, while hydroxide is composed of oxygen and hydrogen, which are nonmetals. The bonding in aluminum hydroxide is likely ionic due to the presence of a metal.
Evaluate ammonia (NH₃): Ammonia consists of nitrogen and hydrogen, both nonmetals. Thus, the bonding in ammonia is covalent.
Assess neon (Ne): Neon is a noble gas and typically does not form bonds because it is chemically inert. Therefore, there is no covalent bonding in neon.

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Covalent Bonding

Covalent bonding occurs when two atoms share one or more pairs of electrons, typically between nonmetals. This type of bond results in the formation of molecules, where the shared electrons allow each atom to achieve a more stable electron configuration, often resembling that of noble gases. Understanding the nature of covalent bonds is essential for determining the bonding characteristics of various substances.
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Chemical Bonds

Molecular Structure

The molecular structure of a substance refers to the arrangement of atoms within a molecule and the types of bonds that hold them together. This structure influences the physical and chemical properties of the substance, including its reactivity and state of matter. Analyzing the molecular structure helps in identifying whether a substance is likely to exhibit covalent bonding.
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Molecular Formula

Electronegativity

Electronegativity is a measure of an atom's ability to attract and hold onto electrons in a bond. In covalent bonds, the difference in electronegativity between the bonded atoms can indicate the bond's character; small differences suggest nonpolar covalent bonds, while larger differences can lead to polar covalent bonds. Understanding electronegativity is crucial for predicting the type of bonding in various substances.
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Electronegativity Trends
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