Polar Covalent Bonds and Polar Molecules (HSC SSCE Chemistry): Flashcards

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Polar Covalent Bonds and Polar Molecules
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Polar covalent bonds

Covalent bonds with unequally shared electrons

What δ+\delta^+ and δ\delta^- represent

Partial charges, smaller than full electron/proton charges

Electronegativity

Atom's ability to attract bonding electrons towards itself

Dipole

Equal but opposite charges separated in space

Polar molecules

Molecules with a net dipole that doesn't cancel out

How molecular shape affects polarity

Determines if dipoles add up or cancel out

H2O\text{H}_2\text{O} polarity and shape

Polar; bent shape causes dipoles to add, not cancel

CH4\text{CH}_4 polarity

Non-polar; tetrahedral shape makes dipoles cancel completely

Most electronegative element

Fluorine

Two steps to determine if molecule is polar

  1. Identify polar bonds 2. Check if dipoles cancel via shape

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