C6HW10a_13 - 12/18/11 View Attempt Vie T Attempt 13 of...

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Unformatted text preview: 12/18/11 View Attempt Vie T Attempt 13 of unlimited : S C 6HW10a : S N N : T : 17, 2011 4:19 PM 17, 2011 4:39 PM 00:19:36 Total score: 9/10 = 90% T 0.0 M : 10 Done 1. T 4.1 (C . 103 C I ) 1850 J/ 1 , ( .O ) 2 ? 1 = 4.184 J. C . Student Response Ans er: S C orrect Ans er 18.5 18.5 : 1/1 2. A 225 J 645 J .C . Student Response C orrect Ans er 1. - 420 J 2. 420 J 3. - 870 J 4. 870 J 5. N S : 5% . 1/1 3. A 508 J ( 1,199 J J)? C .W . Student Response Ans er: S : learn.uh.edu/webct/urw/ C orrect Ans er - 691 - 691 1/1 /ViewStudentAttempt.dowebct?attempt=5138563 1/4 12/18/11 View Attempt 4. Whic h st at ement is not c orrec t ? Student Response C orrect Ans er A. Int ernal energy, E, is a st at e f unc t ion. B. Heat and work are st at e f unc t ions. C. Heat is given of f t o t he surroundings in an exot hermic reac t ion. D. T he ent halpy c hange is t he heat of reac t ion at c onst ant pressure. E. Ent halpy is a st at e f unc t ion. Sc ore: 0/1 5. A 251 g aluminum engine part at an init ial t emperat ure of 20.4°C absorbs 1,413 J of heat . What is t he f inal t emperat ure of t he part (°C) t o one dec imal plac e? (spec if ic heat c apac it y of Al = 0.900 J/g K)? Student Response Ans er: C orrect Ans er 26.7 26.7 Sc ore: 1/1 6. When 165 mL of wat er at 22°C is mixed wit h 85 mL of wat er at 82°C, what is t he f inal t emperat ure? (Assume t hat no heat is lost t o t he surroundings; of wat er = 1.00 g/mL, spec if ic heat c apac it y of wat er is 4.184 J/g.K) Student Response C orrect Ans er A. 42°C B. 52°C C. 61°C D. –61°C E. None of t hese is wit hin 5% of t he c orrec t answer Sc ore: 1/1 7. Classif y t he f ollowing proc esses as exot hermic or endot hermic : a. exot hermic b. endot hermic an ic e c ube melt ing Ent er a or b Student Response learn.uh.edu/webct/urw/ C orrect Ans er /ViewStudentAttempt.dowebct?attempt=5138563 2/4 12/18/11 View Attempt 1. b Equals b (100%) Sc ore: 1/1 8. When 10 g samples of t he f ollowing mat erials absorb 100 J of heat , t he t emperat ure inc rease indic at ed is observed. Whic h mat erial has t he largest spec if ic heat c apac it y? Student Response C orrect Ans er A. wat er, 2 K B. wood, 6 K C. c opper, 26 K D. c ement , 11 K E. glass, 12 K Sc ore: 1/1 9. When 40.0 mL of 0.200 M HCl at 21.5 C is added t o 40.0 mL of 0.200 M NaOH also at 21.5 C in a c of f ee- c up c alorimet er, t he t emperat ure of t he result ing solut ion rises t o 22.8 C. Assume t hat t he volumes are addit ive, t he spec if ic heat of t he solut ion is and t hat t he densit y of t he solut ion is Calc ulat e t he ent halpy c hange, H in kJ f or t he reac t ion: Student Response C orrect Ans er A. - 54.3 kJ B. - 435 kJ C. +21.5 kJ D. +48.6 kJ E. +435 kJ Sc ore: 1/1 10. Calc ulat e Hrx n f or 2NOCl( ) => N2( ) + O2( ) + Cl2( ) given t he f ollowing set of reac t ions: 1/2N2( ) + 1/2O2( ) => NO( ) Hrx n = 90.3 kJ NO( ) + 1/2Cl2( ) => NOCl( ) Hrx n = –38.6 kJ Student Response learn.uh.edu/webct/urw/ /ViewStudentAttempt.dowebct?attempt=5138563 C orrect Ans er 3/4 12/18/11 View Attempt A. 129 kJ B. 103 kJ C. 51.7 kJ D. 258 kJ E. None of t hese is wit hin 5% of t he c orrec t answer Sc ore: D 1/1 e learn.uh.edu/webct/urw/ /ViewStudentAttempt.dowebct?attempt=5138563 4/4 ...
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