2021review - Page 1 2021review Student 1 Which of the...

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Unformatted text preview: Page 1 2021review Student: ___________________________________________________________________________ 1. Which of the following is true for pure oxygen gas, O 2 ( g ) at 25°C? A. ∆ H ° f > 0 B. ∆ H ° f < 0 C. ∆ G ° f > 0 D. ∆ G ° f < 0 E. S ° > 0 2. Which of the following is necessary for a process to be spontaneous? A. ∆ H sys < 0 B. ∆ S sys > 0 C. ∆ S surr < 0 D. ∆ S univ > 0 E. ∆ G sys = 0 3. Which of the following should have the greatest molar entropy at 298 K? A. CH 4 ( g ) B. H 2 O( l ) C. NaCl( s ) D. N 2 O 4 ( g ) E. H 2 ( g ) 4. Which of the following is true for a system at equilibrium? A. ∆ S ° sys = ∆ S ° surr B. ∆ S ° sys = - ∆ S ° surr C. ∆ S ° sys = ∆ S ° surr = 0 D. ∆ S ° univ > 0 E. None of these is a sufficient condition. Page 2 5. Which of the following is always true for an exothermic process? A. q sys > 0, ∆ S surr < 0 B. q sys < 0, ∆ S surr > 0 C. q sys < 0, ∆ S surr < 0 D. q sys > 0, ∆ S surr > 0 E. w < 0 6. When a sky diver free-falls through the air, the process is A. non-spontaneous because he is accelerating due to the force applied by gravity. B. non-spontaneous because he is losing potential energy. C. non-spontaneous because he had planned the jump for two weeks. D. spontaneous. E. in equilibrium. 7. Which, if any, of the following processes is spontaneous under the specified conditions? A. H 2 O( l ) → H 2 O( s ) at 25°C B. CO 2 ( s ) → CO 2 ( g ) at 0°C C. 2H 2 O( g ) → 2H 2 ( g ) + O 2 ( g ) D. C(graphite) → C(diamond) at 25°C and 1 atm pressure E. None of these is spontaneous. 8. Which relationship or statement best describes ∆ S ° for the following reaction? HgS( s ) + O 2 ( g ) → Hg( l ) + SO 2 ( g ) A. ∆ S ° ≈ B. ∆ S ° < 0 C. ∆ S ° > 0 D. ∆ S ° = ∆ H °/ T E. More information is needed to make a reasonable prediction. Page 3 9. Which relationship best describes ∆ S ° for the following reaction? CO( g ) + H 2 O( g ) → CO 2 ( g ) + H 2 ( g ) A. ∆ S ° = ∆ H ° B. ∆ S ° = ∆ H °/ T C. ∆ S ° > 0 D. ∆ S ° < 0 E. ∆ S ° ≈ 10. Which relationship or statement best describes ∆ S ° for the following reaction? CaO( s ) + CO 2 ( g ) → CaCO 3 ( s ) A. ∆ S ° ≈ B. ∆ S ° < 0 C. ∆ S ° > 0 D. ∆ S ° = ∆ H °/ T E. More information is needed to make a reasonable prediction. 11. Which of the following pairs has the member with the greater molar entropy listed first? All systems are at 25°C. A. CO( g ), CO 2 ( g ) B. NaCl( s ), NaCl( aq ) C. H 2 S( g ), H 2 S( aq ) D. Li( s ), Pb( s ) E. H 2 ( g ), H 2 O( g ) 12. You are given pure samples of ethane, C 2 H 6 ( g ), and toluene, C 7 H 8 ( l ). What prediction would you make concerning their standard molar entropies at 298 K?...
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2021review - Page 1 2021review Student 1 Which of the...

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