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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) No, polar or non-polar is for covalent (sharing) bonds
10) False
11) H2O1 would have higher IMF since both have Hydrogen bonding IMF but H2O1 has two Hydrogen bonding.
Ethanol (name of CH3CH2OH) has lower IMF strength so it will boil first (i.e. has lower boiling point.
12)