chem lecture 15

chem lecture 15 - Exam 2 feedback Final Exam (Dec. 9/12):...

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Chemistry 6A Exam 2 feedback Final Exam (Dec. 9/12): review session, extra office hours, conflicts Bonus points (I haven’t overlooked this!) Grades, including clicker points Final assignment (Reading/problems; Chapter 4 and 5.1-5.7)
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Chemistry 6A Is there any conceptual or problem-based topic from Exam 2 that remains ‘fuzzy’ for you? (a) Yes (b) No (c) I’m not sure; I haven’t reviewed the answer key
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Chemistry 6A Which Exam 2 topic will you need to review the most prior to the Final Exam? (a) Lewis structures (b) VSEPR theory and molecular dipoles (c) Valence bond theory and hybridization (d) Molecular orbital theory (e) Empirical / molecular formulas
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Chemistry 6A To help plan ahead, please indicate your preference for a review: (a) Sat. December 6, AM (b) Sat. December 6, Afternoon (c) Sun. December 7, AM (d) Sun. December 7, Afternoon (e) Sun. December 7, Evening
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Chemistry 6A Which hydrocarbon pair below has identical mass percentages of C? (a) C 3 H 4 and C 3 H 6 (b) C 2 H 4 and C 3 H 4 (c) C 2 H 4 and C 3 H 6 (d) C 2 H 4 and C 4 H 2 (e) I’m not sure 5
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Chemistry 6A What is the mass of a single buckyball C 60 molecule? a) 12.0000 g b) 60.0 g c) 44.0 g d) 7.2 x 10 2 g e) 1.2 x 10 -21 g 6
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Chemistry 6A 7 The study of the quantitative aspects of chemical formulas and chemical reactions: How much reacts? How much is produced? Is there a limiting reactant? What is the yield?
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Chemistry 6A 8 A chemical reaction is a process in which one set of substances, the reactants , is transformed into a new set of substances, the products . It is represented by a chemical reaction equation in which: Symbols and formulae are used to represent reactants and products Stoichiometric coefficients are used to balance the equation The Law of Conservation of Mass requires a material balance for each element present in the equation.
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Chemistry 6A 9 Reactants Products Step 1: Balance number of atoms of each element on both sides. 2 Hs on LHS, 4 on RHS. To balance H, multiply H 2 by 2: Step 2: Include the states of all reactants and products . CO + H 2 CH 3 OH CO + 2 H 2 CH 3 OH CO(g) + 2 H 2 (g) CH 3 OH(g) (g) - gas (l) - liquid (s) – solid (aq) - denotes a solution of a solute dissolved in H 2 O, the solvent Stoichiometric coefficients (1 is never displayed)
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Chemistry 6A 10 For modern chemical research, we also require the conditions for a reaction. This is important for repeatability, as well as scale-up from laboratory to chemical plant. Industrial synthesis of methanol: CO(g) + 2 H 2 (g) CH 3 OH(g) 350 ˚C 340 atm ZnO, Cr 2 CO 3 High pressure, use of metal catalyst!
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Chemistry 6A 11 Reactants are consumed and products are formed in definite proportions, as given by the coefficients in the balanced equation. The
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chem lecture 15 - Exam 2 feedback Final Exam (Dec. 9/12):...

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