Compare a covalent bond between two hydrogen atoms with a...

Name: Problem 8, Chapter 2: Life: The Science of Biology
Uploaded: 2021-03-23T22:04:13-08:00
Duration: 2 min 53 s
Channel: Christina Sorrentino
Description: Compare a covalent bond between two hydrogen atoms with a hydrogen bond between a hydrogen and an oxygen atom, with regard to the electrons involved, the role of polarity, and the strength of the bond.

Compare a covalent bond between two hydrogen atoms with a hydrogen bond between a hydrogen and an oxygen atom, with regard to the electrons involved, the role of polarity, and the strength of the bond.

Key Concepts

Covalent Bond

A covalent bond is a strong chemical bond formed by the sharing of electrons between atoms. This type of bond results in a stable interaction where each atom contributes electrons to achieve a full outer electron shell. The electrons are concentrated in the bonding region between the two nuclei, creating a strong link that defines the molecular structure of compounds.

Hydrogen Bond

A hydrogen bond is a weaker, non-covalent interaction that occurs when a hydrogen atom covalently attached to a highly electronegative atom interacts with a lone pair of electrons on another electronegative atom. This bond is not the result of electron sharing but is primarily driven by electrostatic attractions between partial charges, making it weaker and more transient compared to covalent bonds.

Polarity

Polarity refers to the distribution of electrical charge over the atoms in a molecule, resulting from differences in electronegativity. In chemical bonds, when there is a significant difference in electronegativity, one end of the bond acquires a partial negative charge while the other end becomes partially positive. This feature is crucial in hydrogen bonds, as the polarity creates the attractive forces between the positively charged hydrogen and the negatively charged atoms of adjacent molecules.

Bond Strength

Bond strength is a measure of how much energy is required to break a bond. Covalent bonds, due to the direct sharing of electrons, are generally highly stable and require substantial energy to dissociate. In contrast, hydrogen bonds are much weaker because they are based on electrostatic attractions rather than electron sharing. This difference in bond strength is vital in determining the physical and chemical properties of substances, like boiling points and solubility.

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