Chem 2 MIDTERM 1 Form 2A KEY

Chem 2 MIDTERM 1 Form 2A KEY - Midterm 1 Exam Form A, CHEM...

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(Chapters 2, 3, 4 and 6) Name: _________________________ Date: ____________ Please be sure the chemical equation(s) given in the question(s) below are balanced before you attempt to answer the respective question(s). 1. What is the % by mass of P in Al 2 (HPO 4 ) 3 ? a) 9.06 b) 27.17 c) 23.68 d) 38.89 e) 18.81 2. What is the oxidation state of the carbons in ethanol, CH 3 CH 2 OH? a) +2 b) -4 c) +4 d) -2 e) 0 3. Considering the unbalanced REDOX reaction below: MnO 4 - + N 2 H 4 MnO 2 + N 2 What will the coefficients be for MnO 4 - and OH - , respectively, when the equation is balanced under basic conditions? a) 4 and 4 b) 4 and 5 c) 3 and 7 d) 2 and 2 e) 7 and 5 4. An unknown acid contains only hydrogen, carbon and oxygen; the acid was analyzed and found to contain 3.88% hydrogen, 34.62 % carbon and 61.50% oxygen. Assuming the unknown acid is diprotic, what is its molecular formula if 80.00 g of NaOH were required to completely neutralize 208.14 g of the unknown diprotic acid?
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Chem 2 MIDTERM 1 Form 2A KEY - Midterm 1 Exam Form A, CHEM...

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