CHEM107 Quiz: Chem Exam 3 Review
24 Feb 2019
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Department
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Professor
1. Draw Lewis structures of (biologically relevant) octet obeying compounds
a.
2. Identify the best Lewis structure for a compound based on formal charge
calculations
a.
b. VE-NE-(BE/2)
c. Formal charge= core charge- #of assigned electrons
3. draw Lewis structures and accurately name polyatomic ions
a. First, name the cation, which is just the name of the element. Next, name
the anion.
Document Summary
Draw lewis structures of (biologically relevant) octet obeying compounds a. Next, name the anion: draw appropriate resonance structures, resonance structures that consist of more than one lewis structure, contrast bond length and strength in molecules and resonance structures, the shorter the bond the stronger it is b. Vsepr theory: predict molecular shape a. is the three-dimensional arrangement of the atoms that constitute a molecule. 10. explain why hybridization is necessary to explain molecular geometry: hybridization is necessary to adequately explain bonding in molecules. The concept of half filled orbitals overlapping is not enough. 11. predict theoretical yield a. (given (g) /molar mass(g)) * (product (mol) /limiting (mol) )* product molar mass(g/mol)= theory (g: whichever theoretical yield is the least is the limiting reagent. 12. calculate % yield of a reaction: percent yield=( actual yield/ theoretical yield) * 100. 13. recognize the limiting reagent in a reaction: the molecule that runs out first.
