moule winter 2011 che2b

moule winter 2011 che2b - Midterm I Page 1 of 11 CHEMISTRY...

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Midterm I Page 1 of 11 CHEMISTRY 2B (Sec. A) Midterm I Answer key 4 points for free pending re-grade. Part I: Fill in the Blank Fill in the correct answer (2 pts each) – No partial credit For all fill in answers – one point if they think of something that fits but is not the answer 1) Heat and work are not state functions because they are not __path independent___. 2) ___Reverse Osmosis____________ is used to remove salt from sea water using pressure. 3) The ___critical temperature____________________ is the temperature and pressure above which liquids and gasses are indistinguishable. 4) Δ H soln = Δ H hyd + _ Δ H lattice ______________________________ . 5) An FCC crystal structure has __4_____________________________ atoms in a unit cell. 6) Enthalpy is equal to heat when __pressure_________________________ is constant. 7) Place the following molecules in order of increasing melting temperature N 2 , HF, H 2 O, CH 4 , CO N2 < CH4 < CO < HF < H2O London London dipole H-bond H-bond 8) Write under each molecule from question 7 what type of intermolecular interaction dominates.
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Midterm I Page 2 of 11 9). (8 pts) (inspired by Ch 13 Problem 103) Antifreeze is a mixture of H 2 O (mp = 0 ˚ C and bp = 100 ˚ C) and ethylene glycol C 2 H 6 O 2 (mp = -12.6 ˚ C and bp = 197 ˚ C). Assuming that this solution remains ideal, what is the freezing point (K f (H 2 O = 1.86) (density
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moule winter 2011 che2b - Midterm I Page 1 of 11 CHEMISTRY...

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