Answers To 2021-2022 Honors Chem328 Polarity, IMF And Physical Properties Review HW

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Here are the answers to 2021-2022 Honors Chem328 Polarity, IMF and Physical Properties Review HW

1a) Ionic 1b) Polar 1c) Non-polar 1d) Polar 1e) Ionic 1f) Polar

2)

N₁H₃: 8ve^-, 3 single bonds, N is central atom with 1 lone pair (LP), Pyramidal (107.0°), sp³
B₁F₃: 24ve^-, 3 single bonds, B is central atom with no LP, Trigonal planar, 120°, sp²
N₂: 10ve^-, 1 triple bond, no central atom, Linear (180°), NA
C₁O₂: 16ve^-, 2 double bond, C is central atom with 0 LP, Linear (180°), sp

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

4) sp₃ hybridized

5)No the compound can not exist because N has only s & p orbitals and you d orbitals to make the hybridization (dsp₃).

6)+-->, Arrow over the more electronegative atom (or whatever way you memorize the symbol).

7) Ionic ΔEN> or = 1.7
polar bond is 1.7<ΔEN> or = 0.8
non-polar ΔEN<0.8

8) Assume polar prove non-polar

9) 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).

10) Dipole-dipole (D - D) interaction

11) Yes

12) No, polar or non-polar is for covalent (sharing) bonds

13) False

14) NH₃, has more Hydrogen bond (actually it is H₂O₁)

15) Boiling is based on CF, London dispersion forces (LDF). Octane has a higher IMF since it a higher molar meaning more electrons so more Instantaneous dipoles. So since IMF is higher, it will take more energy (higher boiling point) so boiling first means lower boiling point (Hexane).

16) H₂O₁ is a polar molecule and oil is a hydrocarbon (C_xH_y) a non-polar molecule. So H₂O₁ exerts coloumbic force (CF) while oil does not. So H₂O₁ molecules are interacting with other H₂O₁ molecule so they will "push oil molecules" around so they will be together.