2007-07-25 08:36:18 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
H2S = polar. The electronegativities of H and S are different, and the H-S-H molecule is bent at a 90deg angle, so there is a slight negative charge on the sulfur "head" and a slight overall positive charge on the "wings."
CF4 = nonpolar. The electronegativities of C and F are very different, so there is a fair negative charge on each F and a fair postive charge on C. The CF4 molecular is symmetrical however: Imagine the C sitting on a tripod of 3 F's, with the 4th F sticking up in the air. So the overall molecule is nonpolar.
2007-07-25 08:50:15 · answer #1 · answered by steve_geo1 7 · 0⤊ 0⤋
H2S is polar because the sulfur atom has a pair of "lone pair" electrons. These are higher in electron density than the two hydrogens and this gives H2S polarity. It is the same reason water (H2O) is polar.
CF4 is completely surrounded by fluorine and this means there is no polarity. Teflon is a very long chain of repeating (CF2) units and its nonpolarity makes it very inert.
2007-07-25 08:44:40 · answer #2 · answered by Roger S 7 · 0⤊ 0⤋
Nonpolar
2007-07-25 08:38:45 · answer #3 · answered by Sam 2 · 0⤊ 0⤋
H2S-polar
CF4-non-polar
2007-07-25 16:20:43 · answer #4 · answered by Dr. Eddie 6 · 0⤊ 0⤋
They are both non polar because the shapes of both molecules are symmetrical and so even though there are different values of electronegativity, they cancel out...
2007-07-25 08:40:21 · answer #5 · answered by hotandbothered 2 · 0⤊ 0⤋
you have to draw them out and see if they have radial symmetry. if they don't then theyre polar. if they do they're nonpolar
2016-05-18 02:53:32 · answer #6 · answered by ? 3 · 0⤊ 0⤋