Editing Answer To CP Review Homework For LDS, Geometry And Polarity

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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&deg;), sp3
*B1F3: 24ve-, 3 single bonds, B is central atom with no LP, Trigonal planar, 120&deg;, sp2
*N2: 10ve-, 1 triple bond, no central atom, Linear (180&deg;), NA
*C1O2: 16ve-, 2 double bond, C is central atom with 0 LP, Linear (180&deg;), sp 
 
2) 
*CCl4, &#916;EN =0.5, 4 non-polar bonds, Tetrahedral (sym), NA, non-polar molecule, LDF 
*<nowiki>BeCl</nowiki>2, &#916;EN =1.5, 2 polar bonds, Linear (sym), Yes, non-polar molecule, LDF
*CS2, &#916;EN=0.0, 2 non-polar bonds, Linear (sym), non-polar molecule, LDF
*NF3, &#916;EN=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 &#916;EN> or = 1.7 
polar bond is 1.7<&#916;EN> or = 0.8 
non-polar &#916;EN<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.

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