177Exam2KeyS07

177Exam2KeyS07 - SEAT NO._ DR. JOE BURNETT SPRING 2007 THIS...

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SEAT NO.__________ DR. JOE BURNETT SPRING 2007 THIS EXAM CONSISTS OF 17 QUESTIONS ON 9 PAGES CHEM 177 EXAM II FEBRUARY 28, 2007 NAME______________________ RECIT. INSTR.______________ RECIT. SECT._______________ GRADING Teaching Assistants and Recitation Sections PAGE POINTS SCORE Name Sections Time 2 3 4 5 6 7 TOTAL 15 pts 22 pts 24 pts 10 pts 12 pts 18 pts 101 pts ________ ________ ________ ________ ________ ________ Alex Blom Jason Briski Susan Lorge Timothy Mauldin Kristopher McKee 3, 5 2, 6 7, 8 4, 9 10, 11 9:00, 10:00 8:00, 11:00 11:00, 12:10 9:00, 12:10 1:10, 2:10 QUESTIONS ARE WRITTEN ON BOTH SIDES OF EACH PAGE. SOLUBILITY GUIDELINES, A PERIODIC TABLE , AND SELECTED MOLAR MASSES ARE ON THE LAST PAGE. YOU MAY REMOVE THIS PAGE FOR SCRATCH PAPER. THE ANSWER KEY TO THIS EXAM WILL BE POSTED ON BULLETIN BOARD #5 IN THE HALLWAY EAST OF ROOM 1002 GILMAN AND ON THE CHEM 177 WEBSITE. SHOW ALL WORK. ANSWERS SHOULD INCLUDE APPROPRIATE UNITS AND CONTAIN THE CORRECT NUMBER OF SIGNIFICANT FIGURES. Answer Key
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2 1. (3 pts) A strong electrolyte is one that __________ completely in solution. A. reacts B. ionizes C. disappears D. decomposes 2. (3 pts) The oxidation state of Cr in Cr 2 O 7 2– is __________. A. +14 B. +12 C. +7 D. +6 E. +3 F. –12 3. (3 pts) Which combination will produce a precipitate? A. NaC 2 H 3 O 2 (aq) and HCl (aq) B. NaOH (aq) and HCl (aq) C. AgNO 3 (aq) and Ca(C 2 H 3 O 2 ) 2 (aq) D. KOH (aq) and Mg(NO 3 ) 2 (aq) E. NaOH (aq) and HCl (aq) 4. (3 pts) A chemical reaction that absorbs heat from the surroundings is said to be __________ and has a __________ Δ H at constant pressure. A. endothermic; positive B. endothermic; negative C. exothermic; negative D. exothermic; positive E. exothermic; neutral 5. (3 pts) The reaction between strontium hydroxide and chloric acid produces __________. A. a molecular compound and a weak electrolyte B. two weak electrolytes C. a molecular compound and a strong electrolyte D. two strong electrolytes E. two molecular compounds
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3 6. (8 pts) What is the mass amount of Ni in g of needed to react completely with 0.39 moles of HCl, according to: Ni (s) + 2 HCl (aq) ⎯→ NiCl 2 (aq) + H 2 (g) For full credit, show all work, use units report your answer to the correct number of significant figures. 0.39 mol HCl
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177Exam2KeyS07 - SEAT NO._ DR. JOE BURNETT SPRING 2007 THIS...

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