Chemistry A-Level
Bond angles
What Bond angles means in Chemistry A-Level, as defined for OCR.
Definitions of Bond angles
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Reference: OCR
The characteristic angle for each shape, such as 180° for linear, 120° for trigonal planar, 109.5° for tetrahedral, 107° for pyramidal, 104.5° for non-linear and 90° for octahedral.
These decrease as lone pairs are added, because a lone pair repels more strongly than a bonded pair.
Topics that use Bond angles
- Bonding and structure (OCR A-Level)
Related terms
- Anomalous melting and boiling points
- Average bond enthalpy
- Averaging over similar compounds and its limitation
- bond length and strength
- Bond polarity and lone pairs
- Bond polarity versus molecular polarity
- Comparison of solid, liquid and aqueous states
- Coordinate (dative covalent) bonding
Using Bond angles in the exam
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