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Video instructions and help with filling out and completing form 1221 question 34
The following content is provided under a Creative Commons license your support will help MIT OpenCourseWare continue to offer high quality educational resources for free to make a donation or to view additional materials from hundreds of MIT courses visit MIT opencourseware at ocw.mit.edu if you haven't uh clicked in yet please pay attention to the clicker question and I'll give you a little bit more time to to click in and I'll give you a 10-second warning all right let's let's just go ahead and take 10 more seconds all right does someone want to say how they how they got this one right have anyone willing to say how they got it right we have a American Chemical Society whatever these are called that hang around your neck and clip things to them yes there's the word now oh there we go okay so this molecule is though phosphorus has five valence electrons and then each hydrogen has three so it's for a total of eight so it has three bonding and then one lone pair which makes it a tetrahedral but then the lone pair push the other bonds so it's less than 109.5 degrees excellent yeah so I see that some people just decided that there were three things bound to it and so then then they decided either 120 or less than 120 but you really need to do the lewis structure and see how many lone pairs there are first so once you do the lewis structure then you figure out the parent geometry s enforces some more tetrahedral system alright so more more practice on on these coming up all right so we're continuing on now with molecular orbital theory and we started the course talking about atomic structure and then we talked about atomic orbitals or wave functions and then we moved on to bonding that atoms can come together and bond and talked about the structure of molecules and now we're going to molecular orbitals so and then we'll also talk more about the structure of molecules based on those molecular orbitals on Wednesday so we're really coming all the way around we're using a lot of the ideas that you've seen before but now we're applying them to molecules and then to me this is really an exciting part I love getting up to the molecules and talking about structures and molecules and how orbitals really play a role in those properties that molecules have and then to me the really exciting I like reactions so after we finish with the structures we're going to talk more about how molecules react and so on Friday we're going to be starting that reactions and molecules and getting into thermodynamics so we're sort of winding our way away from orbitals for a while we will come back two D orbitals around Thanksgiving time but we'll have a long time before that where we're talking about reactions so we're about to kind