practice-midterm-i-key

practice-midterm-i-key - Your name(Last(First Your...

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Your name (Last)______________(First)__________ Your section _______Your TA______________ Student ID ______________ Signature ______________ Practice Midterm I (Key) Monday Jan. 28, 2008 2:10 PM – 3:00 PM CHEM 2A, Section C, Winter 2008 Professor Guo This is a closed book exam. The only thing you may consult with is a pocket calculator or similarly functional math tool. There are 8 pages and a periodic table on the back; please make sure your exam is complete before starting. Section points 1 /20 2 /20 3 /20 4 /20 5 /20 6 /20 Total /120
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Problem 1 (20 points) [Simple answers. No more than a phrase or a sentence] What is the most common greenhouse gas? (3 points) CO 2 What is the smallest charge unit? (3 points) 1.602 x 10 -19 C What do you do to achieve chemistry stoichiometry when given a chemical reaction of reactants and products? (3 points) Balancing the chemical reactions How do you define the oxidation state of an element in a compound? (3 points) The number of electrons gained or lost How much solvent should be added to dilute a solution of volume V to one-third of its original concentration? (4 points) 2 V What is the compound specified in the rating of gasoline at gas stations? (4) [Both name and molecular formula] Octane C 8 H 18
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Problem 2 (20 points) There are two isotopes for boron. The percent natural abundance for the lighter isotope is
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practice-midterm-i-key - Your name(Last(First Your...

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