bonus exam final 4

bonus exam final 4 - Bonus Final Exam 4 1 Identify the...

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————————————————————————————————————— Bonus Final Exam 4 ————————————————————————————————————— 1 Identify the acidic protons in formic acid, HCH 2 O 2 , shown below. ( A ) H atoms 1 and 2 ( B ) H atoms 1 and 3 ( C ) H atoms 1 and 2 and 3 ( D ) only H atom 3 ( E ) H atoms 2 and 3 2 A 20.0 mL sample of NH 3 is titrated with 0.15 M HCl solution. What is the approximate pH at the equivalence point? 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 0.0 5.0 10.0 15.0 20.0 25.0 30.0 mL of 0.15 M HCl pH ( A )pH 8.0 ( B 7.0 ( C 2.5 ( D 9.5 ( E 5.0 3 What is the voltage of the voltaic cell at 25°C under the following conditions: [Ce 4 ] 0.15 M, [Ce 3 ] 0.25 M, [Mn 2 ] 0.45 M, [H ] 0.017 M. (See cover page for Table of Standard Reduction Potentials)
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2H 2 O( ) 2Ce 4 (aq) Mn 2 (aq) 2Ce 3 (aq) MnO 2 (s) 4H (aq) ( A ) E cell 0.73 V ( B ) E cell 0.64 V ( C ) E cell 0.21 V ( D ) E cell 0.57 V ( E ) E cell 0.38 V 4 What is K a of HSeO 4 , if a 0.100 M HSeO 4 solution at equilibrium is dissociated 37.2%? ( A )3 .7 10 2 ( B )5 .1 10 1 ( C )1 .4 10 3 ( D )7 10 1 ( E )2 .2 10 2 5 Which statements below correctly describe conditions at equilibrium? (i) Q K (ii) Q 1 (iii) Δ G rxn 0 ( A ) Only statement (i) is correct. ( B ) Only statement (i) and (iii) are correct. ( C ) Statement (i) and (ii) and (iii) are all correct. ( D ) Only statement (ii) and (iii) are correct. ( E ) Only statement (i) and (ii) are correct. 6 How many kJ of heat are absorbed by an aluminum frying pan that weighs 745 g and was heated on a stove from 25 C to 205 C? Specific heat of Aluminum 0.902 J/ g . C . ( A ) 16.8 kJ ( B ) 77.4 kJ ( C ) 121 kJ ( D ) 321 kJ ( E ) 138 kJ 7 When a certain reaction occurs, the system loses 1150 J of heat to the surroundings. At the
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same time, as the volume of the system decreases, the surroundings perform 480 J of pressure-volume work on the system. What is the change in the internal energy of the system? ( A ) 552 J ( B ) 1630 J ( C ) - 1630 J ( D ) 670 J ( E ) - 670 J 8 Which of the following statements about conjugate acids and bases is CORRECT? ( A )H 2 SO 4 is the conjugate acid of SO 4 . ( B )OH is the conjugate base of H 3 O . ( C 2 AsO 4 is the conjugate acid of HAsO 4 2 ( D 2 PO 4 is the conjugate acid of H 3 PO 4 . ( E ) HCl is the conjugate base of Cl . 9 While recopying his notes, a student miscopied a statement about reactions taking place in a closed system. Which statement is WRONG ?
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This note was uploaded on 12/09/2009 for the course CHEM 1202 taught by Professor Staff during the Fall '08 term at LSU.

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bonus exam final 4 - Bonus Final Exam 4 1 Identify the...

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