final exam MC review file 4

final exam MC review file 4 - W–1 SECTION W...

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Unformatted text preview: W–1 SECTION W: THERMOCHEMISTRY INDEX: W001 LEVEL: (U) ANSWER: KEYWORDS: introductory concepts ALTERNATIVE FORMAT: (SA) Omit responses. When 45.0 g of an alloy at 100.0 °C is dropped into 100.0 g of water at 25.0 °C, the final temperature is 37.0 °C. What is the specific heat of the alloy? Data for Water specific heat (water) 4.184 J·g –1 · °C –1 (A) 0.423 J·g –1 ·°C –1 (C) 9.88 J·g – 1 ·°C –1 (B) 1.77 J·g –1 ·°C –1 (D) 48.8 J·g –1 ·°C –1 INDEX: W002 LEVEL: (U) ANSWER: KEYWORDS: introductory concepts ALTERNATIVE FORMAT: (SA) Omit responses. A 10.0 g sample of silver is heated to 100.0 °C and then added to 20.0 g of water at 23.0 °C in an insulated calorimeter. At thermal equilibrium the temperature of the system was measured as 25.0 °C. What is the specific heat of silver? Data for Water specific heat (water) 4.2 J·g –1 ·°C – 1 (A) 0.11 J/g·K (C) 17 J/g·K (B) 0.22 J/g·K (D) 34 J/g·K (SA) = short answer; (FR) = free response; (TF) = true/false (U) = understanding; (A) = analysis; (G) = generalization Thermochemistry W–2 INDEX: W003 LEVEL: (U) ANSWER: KEYWORDS: oxidation and reduction ALTERNATIVE FORMAT: (SA) Omit responses. Given the data at 1 atm and 25.0 °C: Species ∆ H f 0 (kJ·mol – 1 ) Cu 2+ (aq) +64.4 Zn 2+ (aq) –152.4 calculate the standard heat of reaction, ∆ H 25 0 , for the reaction Zn (s) + Cu 2+ (aq) → Zn 2+ (aq) + Cu (s) (A) 216.8 kJ are evolved per mole. (B) 88.0 kJ are evolved per mole. (C) 88.0 kJ are absorbed per mole. (D) 216.8 kJ are absorbed per mole. INDEX: W004 LEVEL: (A) ANSWER: KEYWORDS: oxidation and reduction, environmental and consumer chemistry, industrial chemistry, organic chemistry ALTERNATIVE FORMAT: (SA) Omit responses. What is the standard enthalpy of combustion of C 2 H 6 in kJ·mol –1 ? Thermochemical Data H 2 (g) + 1 / 2 O 2 (g) → H 2 O (l) ∆ H = –286 kJ C 2 H 4 (g) + H 2 (g) → C 2 H 6 (g) ∆ H = –137 kJ C 2 H 4 (g) + 3O 2 (g) → 2CO 2 (g) + 2H 2 O (l) ∆ H = –1412 kJ (A) –1275 kJ (C) –31561 kJ (B) –1548 kJ (D) +1834 kJ (SA) = short answer; (FR) = free response; (TF) = true/false (U) = understanding; (A) = analysis; (G) = generalization Thermochemistry W–3 INDEX: W005 LEVEL: (U) ANSWER: KEYWORDS: organic chemistry ALTERNATIVE FORMAT: (SA) Omit responses. Calculate the value of ∆ H for this reaction. C 2 H 4 (g) + H 2 (g) → C 2 H 6 (g) Substance ∆ H f 0 (kJ·mol –1 ) C 2 H 4 (g) 52.5 C 2 H 6 (g) –84.7 (A) –137.2 kJ (C) 32.2 kJ (B) –32.2 kJ (D) 137.2 kJ INDEX: W006 LEVEL: (U) ANSWER: KEYWORDS: industrial chemistry, oxidation and reduction ALTERNATIVE FORMAT: (SA) Omit responses. Given these equations SO 2 (g) → O 2 (g) + S (s) ∆ H = +300 kJ 2SO 2 (g) + O 2 (g) → 2SO 3 (g) ∆ H = –200 kJ calculate the heat of formation of SO 3 (g) ....
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final exam MC review file 4 - W–1 SECTION W...

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