Practice_Exam2_key_B

Practice_Exam2_key_B - CHEMISTRY 1210 Dr. Jack Preses...

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CHEMISTRY 1210 Practice Exam 2 Solutions Dr. Jack Preses Date NAME: ________________________________ SJU I.D.: (PLEASE PRINT) (eight digit number of front of SJU ID card) FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN A 5 POINT DEDUCTION . 1. Before starting, print your name, eight digit SJU I.D. number, and circle your professor’s name. On SIDE ONE of the answer sheet enter your ID number in the first eight boxes of the scantron sheet. Pencil in the corresponding boxes. Print your name where it says "NAME". 2. You should have nothing at your seat except two #2 pencil and a nonprogrammable, non- graphics calculator . Everything else should be at the front of the room. 3. Turn off all electronic devices NOW!! This includes cell phones , paging devices, blackberry, laptop computers or palm pilot. Place these items at the front of the room. 4 This exam consists of 30 multiple choice questions PLUS THE EXTRA CREDIT PROBLEM. Indicate the most appropriate answer to each question on the attached scoring sheet using a #2 pencil. The Exam and Answer Sheet must be returned at the end of the exam period. 5. The answer keys will be posted on WEBCT. 6. Grades will be posted on WEBCT in ONE WEEK . Do not email the professors for your grade. PROPER CONDUCT DURING AN EXAM 1. Communication between students, by any means, is prohibited. 2. Possession of any unauthorized materials (crib notes, cell phones, paging devices, blackberry, laptop, palm pilot or programmable calculators) is prohibited. 3. Violation of either of the above rules can result in a minimum penalty of a grade of zero on this exam. CONSTANTS, CONVERSION FACTORS, AND EQUATIONS N A = 6.022 × 10 23 things/mol 1 atm = 14.696 psi C(H 2 O) = 4.184 Jg 1 °C 1 1 cal = 4.184 J 1J = 2 2 s m kg 1 Cal = 1000 cal A PERIODIC TABLE IS ATTACHED FOR YOUR CONVENIENCE
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1. Which of the following molecules is a basic anhydride? a) SO 2 gas b) P 4 O 10 molecular compound c) Na 2 O ) ( 2 ) ( ) ( 2 2 aq NaOH l O H s O Na + d) NO 2 gas e) Mg(OH) 2 insoluble (but if you can dissolve, its basic) 2. One liter of an intravenous solution contains NaCl, KCl, and CaCl 2 in H 2 O. Which of the following are the solutes? a) Water and KCl b) NaCl and KCl c) KCl, CaCl 2 and water d) CaCl 2 , KCl, and NaCl (because water is the solvent and all three salts are soluble in water) e) NaCl and CaCl 2 3. A precipitation reaction is the reaction a) between an acid and water to form a hydronium ion and an anion b) between two soluble salts to form an insoluble salt and ions c) between a soluble salt and water d) between an insoluble carbonate and acid to form a gas and water e) between two soluble salts to form water 4. Which of the following reactions is an accurate representation of a substance when it is added to water? a) HCl ( aq ) ⎯→ no reaction (wrong, ) ( ) ( ) ( aq Cl aq H aq HCl + + .) b) AgCl ( s ) ⎯→ Ag + ( aq ) + Cl ( aq ) (wrong, AgCl is insoluble in water) c) HC 2 H 3 O 2 ( l ) ⎯→ H + ( aq ) + C 2 H 3 O 2 ( aq ) (100%) (wrong, HC 2 H 3 O 2 is a weak acid therefore not 100% dissociated)) d) Na 2 O ( s ) ⎯→ 2 Na + ( aq ) + O 2– ( aq ) (wrong, see question #1) e) NH 4 NO 3 ( s ) ⎯→ NH 4 + ( aq ) + NO 3 ( aq ) 5. The Arrhenius definition of an acid is: a)
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Practice_Exam2_key_B - CHEMISTRY 1210 Dr. Jack Preses...

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