Double bond — Science definition
A covalent bond in which two pairs of electrons (four electrons) are shared.
Where it is taught
- Covalent Bonding — Bonding, Formulas & Molecular Structure, Physical Science: Chemistry, Grade 11
In use
A double bond is represented by two shared pairs in a simple Lewis model, and a triple bond by three.
Covalent Bonding
Questions using double bond
Problem 1
Answer and explanation
No. Bond order supports a qualitative comparison for suitable species, but measured energy depends on the full bonding environment and defined process.
Bond order summarizes bonding in a model: a Lewis single, double or triple line commonly represents one, two or three shared pairs. For comparable atom pairs, higher bond order often corresponds to shorter, stronger bonds, but bond energies are not exact integer multiples and depend on the surrounding molecule. Bond dissociation energy concerns a specified bond-breaking process. Delocalized structures can have intermediate effective orders, so a selected Lewis drawing should not be treated as a direct ruler or calorimeter.
No. Bond order supports a qualitative comparison for suitable species, but measured energy depends on the full bonding environment and defined process.
Response criteria
- Interpret labels, structures, axes, units and directions correctly.
- Explain the chemistry relationship or mechanism.
- Respect stated assumptions and distinguish observation from inference.