practice q for final solns.docx - Practice questions for...

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Practice questions for third part of CHM 123 1. Which of the following bonds is the most polar? C-H, O-F, C-F, C-S, Cl-N The polarity of a bond is indicated by the differences between the electronegativities between the two atoms. If the difference in electronegativities is between 0.5 and 1.9 the bond is polar. If the difference is greater than 2, the bond is ionic. So, the two atoms with the largest difference in polarities is the most polar bond. 2. Which of the following molecules are non-polar? (The central atom is underlined.) C HCl 3 , C S 2 , N I 3 , I 2 C S, ClC N CS 2 is the only one that is non-polar 3. Which of the following exhibit London Dispersion Forces? Dipole- Dipole? Ion-dipole? H-bonding? H 2 O, CO 2 , HCN, Cr(NH 3 ) 6 3+ all exhibit London Dispersion Forces, both H 2 O and HCN are polar so a pure sample of them would exhibit dipole-dipole forces (between molecules), water is the only one that exhibits hydrogen bonding (the hydrogen must be bonded to an electronegative atom making it
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