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Here is the answers to 2022-2023 Chem328 Review HW for Polarity, IMF and Physical Properties including Solutions, Molarity.
1a) Ionic
1b) Polar
1c) Non-polar
1d) Polar
1e) Ionic
1f) Polar
2) Using Molecular Polarity table:
- CCl4, ΔEN =0.5, 4 non-polar bonds, Tetrahedral (sym), NA, non-polar molecule, LDF
- BeCl2, ΔEN =1.5, 2 polar bonds, Linear (sym), Yes, non-polar molecule, LDF
- CS2, ΔEN=0.0, 2 non-polar bonds, Linear (sym), non-polar molecule, LDF
- NF3, ΔEN=1.0, 3 polar bonds, Pyramidal (not sym), polar molecule, dipole-dipole
3) Made mistake, no question/problem
4)+-->, Arrow over the more electronegative atom (or whatever way you memorize the symbol).
5) Ionic ΔEN> or = 1.8
polar bond is 1.8<ΔEN> or >0.4
non-polar ΔEN<=0.8
6) Ionic compound/bond same strength as metals/metallic bonds (Highest IMF)
Polar molecules containing H-O,H-N,H-F (IMF name is hydrogen bonding)
Polar molecules that don't (IMF name is dipole-dipole interaction)
Non-polar molecules (IMF is London Dispersion Forces, LDF) (Lowest IMF).
7) Dipole-dipole interactions and Hydrogen bonding
8) True, (LDS are only major IMF for non-polar - non-polar molecules interaction and two substance with very large difference in molar mass (# of electrons).
9)
8) Assume polar prove non-polar