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chem finals -MCFinalPractice

chem finals -MCFinalPractice - Chemistry 142D PRACTICE...

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Chemistry 142D P RACTICE F INAL E XAM All problems are worth 10 points for a total of 200 points on the exam. 1. A paper cup has a mass of 1.00 kg when it is filled with 73.59 mL of mercury (density Hg = 13.546 g/mL). What is the mass of the empty cup? a) 31 g b) 31.5 g c) 31.50 g d) 0 × 10 1 g e) 3 × 10 1 g 2. Which are alkaline earth halides? a) CaF 2 , MgBr 2 , SrI 2 b) NaI, KBr, LiF c) PbI 2 , PbBr 2 , CdF 2 d) MgO, MgS, CaO e) Al 2 O 3 , In 2 O 3 , Ga 2 S 3 3. Boron naturally occurs in two isotopic forms. The more common isotope is 11 B (atomic mass 11.01 amu), which is 80.00% abundant. The average atomic mass of boron is 10.81. What is the mass of the other isotope? 4. In the reaction Cu (s) + AgNO 3 (aq) Cu(NO 3 ) 2 (aq) + Ag (s), identify the oxidizing agent. 5. What are the oxidation numbers of carbon in CO 2 and CO 3 2- , respectively?
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