Editing Answer To CP Review Homework For LDS, Geometry And Polarity
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1a. polar (arrow above O)<br> 1b. polar (arrow above Cl) (actually ionic, though)<br> 1c. polar (arrow above N)<br> 1d. polar (arrow above Cl)<br> 1e. non-polar<br> 1f. ionic<br> <br> 2)<br> *N<sub>1</sub>H<sub>3</sub>: 8ve<sup>-</sup>, 3 single bonds, N is central atom with 1 lone pair (LP), Pyramidal (107.0°), sp<sup>3</sup> *B<sub>1</sub>F<sub>3</sub>: 24ve<sup>-</sup>, 3 single bonds, B is central atom with no LP, Trigonal planar, 120°, sp<sup>2</sup> *N<sub>2</sub>: 10ve<sup>-</sup>, 1 triple bond, no central atom, Linear (180°), NA *C<sub>1</sub>O<sub>2</sub>: 16ve<sup>-</sup>, 2 double bond, C is central atom with 0 LP, Linear (180°), sp<br> <br> 2)<br> *CCl<sub>4</sub>, ΔEN =0.5, 4 non-polar bonds, Tetrahedral (sym), NA, non-polar molecule, LDF<br> *<nowiki>BeCl</nowiki><sub>2</sub>, ΔEN =1.5, 2 polar bonds, Linear (sym), Yes, non-polar molecule, LDF *CS<sub>2</sub>, ΔEN=0.0, 2 non-polar bonds, Linear (sym), non-polar molecule, LDF *NF<sub>3</sub>, ΔEN=1.0, 3 polar bonds, Pyramidal (not sym), polar molecule, dipole-dipole <br> 3) Arrow over the more electronegative atom (or whatever way you memorize the symbol).<br> <br> 4) Ionic ΔEN> or = 1.7<br> polar bond is 1.7<ΔEN> or = 0.8<br> non-polar ΔEN<0.8<br> <br> <br> 5) Assume polar prove non-polar<br> <br> 6) Bent<br> <br> 7a. Substance with only 2 atoms<br> 7b. Substance with 3 atoms where central atoms has no lone pairs (LP)<br> <br> 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. <br> <br> 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).<br> <br> 10) Pyramidal geometry is NOT symmetrical.<br>
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