12-2-11 - Chemistry 1A F11 12.2.11 Dr. Shaka Review...

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339 Chemistry 1A F11 12.2.11 Dr. Shaka Course Code 40000 Review Problems • Which one (if any) is linear: NO 2 + , NO 2 , and NO 2 ? • Here we have to count the number of bonds to the nitrogen (which is central) and then see if there are any lone pairs left. We then use VSEPPR to predict the orbital geometry, and hence the molecular structure. • For the cation: Linear
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340 Chemistry 1A F11 12.2.11 Dr. Shaka Course Code 40000 Review Problems • For NO 2 : NOT Bent, 134.3° • But the correct way!
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341 Chemistry 1A F11 12.2.11 Dr. Shaka Course Code 40000 Review Problems • For NO 2 : Bent, 115.4° • The extra electron pair causes the structure to bend even more; we know the lone pair takes up more room so <ONO is less than 120° here. Watch formal charges! They can look like lone pairs and cost you big points!
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342 Chemistry 1A F11 12.2.11 Dr. Shaka Course Code 40000 Review Problems • Which of the following structures are tetrahedral: NH 4 + , SF 4 and XeF 4 ? • Please draw all these out yourself before next Wednesday, and make sure you understand how to tell the correct structure. • The ammonium ion is isoelectronic with CH 4 and its Lewis structure has four equivalent bonds. VSEPR then predicts sp 3 hybrids and tetrahedral structure. • The formal charge of +1 is on the nitrogen atom, of course.
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343 Chemistry 1A F11 12.2.11 Dr. Shaka Course Code 40000 Review Problems • With SF 4 we have the four fluorine atoms and another lone pair on sulfur. • Recall that elements after the 2nd period can
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12-2-11 - Chemistry 1A F11 12.2.11 Dr. Shaka Review...

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