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Understanding Bond Types Based on Electronegativity Differences

Learn how differences in electronegativities determine bond types: ionic, polar covalent, or non-polar covalent. Identify bond types for molecules like SnI2, CuF, PH3, P2O3 using electronegativity values. Explore dipoles in polar covalent molecules. Electronegativity values from pg. 151 are used.

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Understanding Bond Types Based on Electronegativity Differences

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  1. Bond ID’s with Electronegativities

  2. Differences in electronegativites will help determine if a bond is ionic, polar covalent, or non-polar covalent. • The separation points are 1.7, and .5 • If the difference is 1.7 or more, it is considered to be ionic. • If the difference is .5 or more, it is considered to be polar covalent

  3. Try it out • What bond types are the following molecules? (use pg 151 for electronegativities) • SnI2 • CuF • PH3 • P2O3

  4. Try it out • What bond types are the following molecules? (use pg 151 for electronegativities) • SnI2 • Sn = 1.8, I = 2.5, difference = .7 • Polar covalent • CuF • Cu = 1.9, F = 4.0, difference = 2.1 • ionic • PH3 • P2O3

  5. Try it out • What bond types are the following molecules? (use pg 151 for electronegativities) • SnI2 • CuF • PH3 • P = 2.1, H = 2.1, diffence = 0 • Non-polar covalent • P2O3 • P = 2.1, O = 3.5, diffence = 1.4 • polar covalent

  6. Finding the Dipoles • polar covalent have dipoles • More electronegative elements have negative dipoles • Draw the dipoles for the polar covalent molecules • SnI2 • P2O3

  7. Finding the Dipoles • I – Sn – I • O – P – O – P – O

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