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My name is Bryan Wang, I have been a practicing hospital pharmacist for the past 5 years. I love teaching and have mentored pharmacy students for the past 4 years.

I have had a passion for the art and science of chemistry ever since I took my first introductory course in middle school. I completed my bachelor's degree and a Doctor of Pharmacy from the University of Michigan in only 6 years (normally an 8-year process). During that time, I coordinated and led formal study groups for advanced chemistry courses for 3 years. I also did research in DNA chemical structures for 2 years.

I truly enjoy education, and I love helping students achieve academic success.

Write the Lewis structure for each molecule.a. $\mathrm{NF}_{3} \quad$ b. HBr $\quad$ c. $\mathrm{SBr}_{2} \quad$ d. $\mathrm{CCl}_{4}$

Write the Lewis structure for each molecule or ion.a. $\mathrm{CI}_{4} \quad$ b. $\mathrm{N}_{2} \mathrm{O}$ $\mathrm{c} . \mathrm{SiH}_{4} \quad$ d. $\mathrm{Cl}_{2} \mathrm{CO}$

Write the Lewis structure for each molecule.a. $\mathrm{CH}_{2} \mathrm{O} \quad$ b. $\mathrm{C}_{2} \mathrm{Cl}_{4}$

How important is this resonance structure to the overall structure of car-bon dioxide? Explain.

Write Lewis structures for each molecule or ion. Include resonancestructures if necessary and assign formal charges to all atoms. If youneed to, expand the octet on the central atom to lower formal charge.\begin{equation}\mathrm{ a.} {SO}_{4}^{2-} \quad \text { b. } \mathrm{HSO}_{4}^{-} \quad \text { c. } \mathrm{SO}_{3} \quad \text { d. } \mathrm{BrO}_{2}^{-}\end{equation}

Write Lewis structures for each molecule or ion. Use expanded octets as necessary.\begin{equation}\begin{array}{lllll}{\text { a. } \mathrm{PF}_{5}} & {\text { b. } \mathrm{I}_{3}^{-}} & {\text { c. }} & {\mathrm{SF}_{4}} & {\text { d. GeF }_{4}}\end{array}\end{equation}