Edexcel GCSE Chemistry · 1CH0
Specification 1.31 · Paper 1, Paper 2
Revise: Formation of Simple Molecular SubstancesOne shared pair forms a single bond; two shared pairs form a double bond.
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GCSE Chemistry · key term
A covalent bond containing two shared pairs of electrons.
Used by Edexcel and OCR
Specification 1.31 · Paper 1, Paper 2
Revise: Formation of Simple Molecular SubstancesOne shared pair forms a single bond; two shared pairs form a double bond.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A covalent bond formed from two shared pairs of electrons.
Revise: Dot and cross diagrams for covalentThe oxygen atoms share two pairs, producing a double bond. Each oxygen also has two lone pairs.
A covalent bond in which two atoms share two pairs of electrons.
For O₂ and CO₂, remember that a double bond contains two shared pairs of electrons—not two electrons in total.
Remember that a double bond contains two shared pairs and a triple bond contains three shared pairs.
Count the bonds around each carbon atom: a double bond counts as two covalent bonds.
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