I Waters heat specific capacity is very pre cisely known II Water is readily

I waters heat specific capacity is very pre cisely

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I) Water’s heat specific capacity is very pre- cisely known. II) Water is readily available. III) Water has an unusually large specific heat capacity. 1. I only 2. II and III 3. I and II 4. I, II and III 5. II only 6. I and III 7. III only 018 10.0points Consider a thermodynamic system that is si- multaneously releasing heat and doing work. The internal energy of this system will: 1. Decrease 2. Increase, decrease, or stay the same de- pending on the magnitudes of heat and work 3. Stay exactly the same. 4. Increase 019 10.0points Which of the following statements is/are true? I) For a given process, Δ H must be zero when external pressure is zero. II) For a given process, Δ U and Δ H must have different values. III) For a given process, Δ U sys and Δ U surr must have the same magnitude.
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Version 001 – EXAM 7 PRACTICE PROBLEMS – chemistry – (78712) 5 1. I, II 2. I, II, III 3. I only 4. III only 5. II, III 6. II only 7. I, III 020 10.0points If you drop a piece of potassium metal into water you get the following exothermic reac- tion: 2 K(s) + 2 H 2 O( ) 2 KOH(aq) + H 2 (g) What are the values of q and w for this reac- tion, at constant temperature and pressure? 1. Both are positive. 2. q is negative and w is positive. 3. q is positive and w is negative. 4. Both are negative. 021 10.0points The formation of chemical bonds from sepa- rated atoms 1. is never spontaneous. 2. increases entropy. 3. may be either endothermic or exother- mic. 4. is always exothermic. 5. is always endothermic. 022 10.0points Which of O 2 (g) , O 2 ( ) , H 2 (g) , H 2 ( ) , H 2 O(g) , H 2 O( ) have a standard enthalpy of formation equal to zero? 1. O 2 (g), O 2 ( ), H 2 (g), H 2 ( ), H 2 O(g), H 2 O( ) 2. O 2 (g), H 2 (g), H 2 O(g) 3. O 2 (g), O 2 ( ), H 2 (g), H 2 ( ) 4. O 2 (g), H 2 (g) 5. All of them, but only at absolute zero 023 10.0points When 1 mol of methane is burned at constant pressure, - 890 kJ / mol of energy is released as heat. If a 3 . 64 g sample of methane is burned at constant pressure, what will be the value of Δ H ? (Hint: Convert the grams of methane to moles. Also make sure your answer has the correct sign for an exothermic process.) 1. -61.1875 2. -202.475 3. -176.888 4. -268.669 5. -257.544 6. -233.625 7. -132.387 8. -140.731 9. -264.219 10. -115.144 Answer in units of kJ. 024 10.0points Calculate the quantity of energy required to change 3.00 mol of liquid water at 100 C to steam at 100 C. The molar heat of vaporiza- tion of water is 40.6 kJ/mol. 1. 300 kJ 2. 122 kJ 3. None of these 4. 40.6 kJ
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Version 001 – EXAM 7 PRACTICE PROBLEMS – chemistry – (78712) 6 5. 13.5 kJ 025 10.0points Calculate the heat of formation for 2 . 6 mol of sulfur dioxide (SO 2 ) from its elements, sul- fur and oxygen. Use the balanced chemical equation and the following information. S(s) + 3 2 O 2 (g) -→ SO 3 (g) Δ H 0 c = - 395 . 2 kJ / mol 2 SO 2 (g) + O 2 (g) -→ 2 SO 3 (g) Δ H 0 = - 198 . 2 kJ / mol 1. -414.54 2. -562.59 3. -384.93 4. -769.86 5. -592.2 6. -503.37 7. -651.42 8. -710.64 9. -621.81 10. -532.98 Answer in units of kJ. 026 10.0points ? heat capacity is the amount of heat required to raise the temperature of one ?
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