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Which have zero dipole moment?(1) 1,1 dichloroethane(2) cis-1,2-dichloroethane(3) trans- 1,2 -dichloroethane(4) none...

Question

Which have zero dipole moment?(1) 1,1 dichloroethane(2) cis-1,2-dichloroethane(3) trans- 1,2 -dichloroethane(4) none

Which have zero dipole moment? (1) 1,1 dichloroethane (2) cis-1,2-dichloroethane (3) trans- 1,2 -dichloroethane (4) none



Answers

Which of the following substances would you expect to have a nonzero dipole moment? Explain, and show the direction of each.
$\begin{array}{ll}{\text { (a) } \mathrm{Cl}_{2} \mathrm{O}} & {\text { (b) } \mathrm{XeF}_{4}} \\ {\text { (c) Chloroethane, } \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}} & {\text { (d) } \mathrm{BF}_{3}}\end{array}$

Everyone, uh, here is the difference is dependent on the lowest structure. If you look for see photo, there was destruction, We found it and a four way. And if we look for us all to which and the bended shame lives of four. So the direction off diaper moment here is from Carlo Toto oxygen and hear from garden toe oxygen. So the neglected each other. So the value off type of moment is equals here. Why here? The value Direction off! Diable moment in this direction Indirection off time or moment in the direction. So the name, direction off! Diable moment is down and the diable moment is not equal. The bar has that. So the Monegro shape is effect on the like. One moment, like here, in case off linear And here, which is been she saying you

Well, my name is Molly. In this question, we can drew restructure from this formula. This is the first structure which is a doobie are from here and to edge from here The 2nd 1 is this br we are and H and years age and the surge want is ever fooling br from year We are from here and the years ich and the years edge from the restructure. We found that the Damien direction off Bible moment in these So here's a diable moment is not equal zero, which is is mean. It has a viable moment also here, that direction off diable moment in these. So the name durable moment is not equal zero. But here we found the direction off. B R is neglected each other. So this means that the amount off diable moment is equal to Vo, okay?

Problem. 43 says the state, whether or not each diagram in your book shows a permanent dye pole moment or, in other words, whether it's a polar molecule or not. So I've provided here really, really rough sketches of what your book shows. Um, just to sort of illustrate, um, for you hear what each of the diagrams looks like. Um, start with a here. Certain birth that blue in general indicates positive charge while read. Negative, um, shows negative charge because I can show you those in the appropriate colors and whenever they're completely separated like this is usually indicates a very polar molecule or a permanent I pull moment. So in a we do have a permanent type of woman for be here. It's hard to tell in my drawing, but if you look at the book, it's a little easier there. There's blue on each of these outside sort of nodes, um, and green or red in very localised places. But in general, the's charge distribution is pretty symmetrical throughout this molecule, so it's generally non polar and does not have a type of moment here. You can also see if the charge is distributed throughout the molecule and isn't localized to one side. So this is again a fairly symmetrical or non polar molecule for D hear, its shape is a little bit different from a but you can see again that charge positive charge here is localized to one end of a molecule, and negative charge is localized to the other. So again, this is a polar molecule and has a permanent type. Oh, moment. This is non polar with charge being sort of evenly distributed throughout. And so is this one here. So despite the shape of each of these molecules, um, basically, the tell here is whether or not color is distributed symmetrically or completely to one side of the molecule. And that usually tells you whether or not each molecule is polar were non polar. And whether it has a permit, I pull moment. We're not

Similar to problem on 23. Problem on 25 asks which of the molecules and problem on 21 have a net by poll moment. Or in other words, which of these molecules was polar? So part a here is seen on, um Diaco Ride s So I've drawn here for you. The structure that we determined, um, for each of these molecules and problem 1 21 And here you can see that scene on is bound to to Corinne Adams and has three surrounding will in pairs of electrons. So, in general, lone pairs of electrons and bonds don't cancel each other out. Um uh, charge wise, meaning that, uh, they're not symmetrical if you consider them together. But if you consider ah, lone pairs against lone pairs and bonds against Bonds, you can see that this scene on as, um evenly spaced electron pairs that cancel each other out as well as evenly spaced your symmetrical lt's, you know, in Korean bonds. So what that means is that this molecule is actually symmetrical and does not have a permanent or net die cold moment. On the other hand, um, this iodine trickle right and part B here is, um, uh, imbalanced and that it has thes three. Um, these three iodine Korean bonds balanced against two lone Paris electrons. So this is asymmetrical and therefore has a typo moment. That means that this molecule here is, in fact, polar. The same could be said of Hillary. Um um Tetro fluoride. Again, it's balancing the's er story, um, foreign bonds against a little in pair of electrons. Um, so thes two molecules here are polar phosphorus pentacle, right. However, um, each of its available positions for either binding or alone. Pair of electrons is bound by a quarry in making this a non poor or a symmetrical molecule. So the two here that are polar R B and C


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