ch 8 bonding general concepts lecture 2 for posting

# ch 8 bonding general concepts lecture 2 for posting - Exam...

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Exam 3 Average 10.07 Standard deviation 3.45 To calculate your standardized score: (Your grade – 10.07)/3.45 last year lowest standard score final grade: A 1.1 B 0.21 C -0.58 D -0.81 These are not guarantees of where the breaks will be this year.

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Rules Governing Formal Charge To calculate the formal charge on an atom: 1. Take the sum of the lone pair electrons and one-half the shared electrons. 2. Subtract the number of assigned electrons from the number of valence electrons on the free, neutral atom.
Consider the Lewis structure for POCl 3 . Assign the formal charge for each atom in the molecule. P: 5 – 4 = +1 O: 6 – 7 = –1 Cl: 7 – 7 = 0 P Cl Cl O Cl

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Rules Governing Formal Charge The sum of the formal charges of all atoms in a given molecule or ion must equal the overall charge on that species.
Which molecule or ion violates the octet rule? a) H 2 O b) NO 3 - c) PF 3 d) I 3 - e) None of these For I 3 ¯ S = N – A N = 3x8 = 24 A = 3x7 + 1 = 22 S = N – A = 24 – 22 = 2 1 bond. Impossible

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ch 8 bonding general concepts lecture 2 for posting - Exam...

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