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Here are the answers to 12 Problems on Bond Polarity Determination (using Bond Polarity Worksheet) (showed polar bond designation in ( ) assuming elements arrangement in problem).
1) Non-polar bond(ΔEN = 0.4)
2) Ionic, form ions(ΔEN = 2.1)
3) Polar bond (ΔEN =0.9) (<--+ above)
4) Non-polar bond (ΔEN = 0.4)
5) Ionic, forms ions (ΔEN = 1.8)
6) Non-polar bond (ΔEN = 0.0)
7) Polar bond (ΔEN = 1.0) (+-->)
8) Polar bond (ΔEN =1.5) (+-->)
9) Polar bond (ΔEN =1.2) (<--+)
10) Non-polar bond (ΔEN = 0.0)
11) Ionic, form ions (ΔEN = 2.0)
12) Polar bond (ΔEN =1.4) (+-->)