Answer To CP Review Homework For LDS, Geometry And Polarity

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*N₁H₃: 8ve^-, 3 single bonds, N is central atom with 1 lone pair (LP), Pyramidal (107.0^o), 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^o), NA
*C₁O₂: 16ve^-, 1 double bond, C is central atom with 0 LP, Linear (180 ^o), sp

*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

1a. polar (arrow above O)
1b. polar (arrow above Cl) (actually ionic, though)
1c. polar (arrow above N)
1d. polar (arrow above Cl)
1e. non-polar
1f. ionic

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

3) Arrow over the more electronegative atom (or whatever way you memorize the symbol).

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

5) Assume polar prove non-polar

6) Bent

7a. Substance with only 2 atoms
7b. Substance with 3 atoms where central atoms has no lone pairs (LP)

8) Polar means valence electrons are unevenly distributed throughout the bond or molecule (making 2 different regions, region with alot of electron, partially negative area, and region of few valence electron, partially positive area). Non-polar means there are no regions of alot or few valence electrons. Electrons are evenly distributed throughout the bond or molecule.

9) Ionic compounds can not be polar or non-polar since atoms in ionic compounds are now ions (anion took valence electron from other atom, and cation released electroctrons).

10) Pyramidal geometry is NOT symmetrical.