Chemistry 1A - Fall 2000 - Pines - Midterm 3

csolid o2 gas d co2 solid co2 gas co2 gas e

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Unformatted text preview: (gas) C.) C(solid) + O2 (gas) D.) CO2 (solid) CO2 (gas) CO2 (gas) E.) 2 MgO(solid) + C(solid) 3.) 2 Mg(solid) + CO2 (gas) For the exothermic formation of ammonia, N2(gas) + 3 H2 (gas) which will act to favor the formation of ammonia? A.) high pressure B) high volume D.) catalyst 4.) C.) high temperature E.) all of the above Which of the following is true for the isothermal expansion of an ideal gas? A.) w > 0 5.) 2 NH3(gas) B.) ∆T > 0 C.) ∆V < 0 D.) ∆SSys > 0 E.) ∆SSurr > 0 Which of the following has the greatest entropy? A.) 1 mole of water at 25 oC and 1 atm B.) 1 mole of water at 100 oC and 1 atm C.) 0.5 moles of water plus 0.5 moles of steam at 100 oC and 1 atm D.) 1 mole of steam at 100 oC and 1 atm E.) 1 mole of steam at 100 oC and 0.5 atm Page 3 of 3 6.) Which is true for the following exothermic reaction at 1 atm? Fe(solid) + CO(gas) FeO(solid) + C(solid) A.) B.) C.) D.) E.) 7.) Name:_________________________________________ Proceeds spontaneously at all temperatures Proceeds spontaneously at no temperatures Proceeds spontaneously at high temperatures Proceeds spontaneously only at 0 K Proceeds spontaneously at low temperatures How many glasses of water (200 mL) can be heated from 10 oC to 35 oC by the combustion of a mini-Snickers bar (40 Cal)? A.) 1 8.) C.) 40 D.) 500 E.) 1000 To the formation of which compound from the elements in standard states does the following process of bond-breaking ! bond formation correspond? 2 C-C +2 H-H + ½ O=O ! 3 C-H + C-O + O-H A.) ethanol 9.) B.) 8 B.) formaldehyde C.) methanol D.) acetaldehyde E.) acetic acid Using the information on page 1, estimate ∆Ho for the process in question 8. A.) 246 kJ/mol B.) 45 kJ/mol C.) 3 kJ/mol D.) -45 kJ/mol E.) -246 kJ/mol 10.) When you burn wood, energy is released. Which statement best describes where that energy comes from? A.) The reaction breaks the chemical bonds in the wood, releasing their energy. B.) Energy is released because wood and all organic materials have high energy bonds...
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