apchem112110

apchem112110 - David Kim Period 7-8 APCHEM 11/21/10 38....

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David Kim APCHEM Period 7-8 11/21/10 38. Explain why water forms into beads on a waxed car finish. The cohesive forces are stronger than the adhesive forces. That's why the water stays as drops or beads on the wax. Also the water is a polar molecule while the wax is non-polar. 72. What type of solid will each of the substances form? (a) diamond: atomic, network (b) PH3: molecular (c) H2: molecular (d) Mg: atomic, metallic (e) KCl: ionic (f) quartz: network (g) NH4NO3: ionic (h) SF2: molecular (i) Ar: atomic (j) Cu: atomic, metallic (k) C6H12O6: molecular 85. A substance, X, has the following properties: Specific Heat Capacities ∆Hvap 20. kJ/mol C(s) 3.0 J/g · °C ∆Hfus 5.0 kJ/mol C(l) 2.5 J/g · °C bp 75°C C(g) 1.0 J/g · °C mp -15°C Sketch a heating curve for substance X starting at -50.°C 86. Given the data in Exercise 85 on substance X, calculate the energy that must be removed to convert 250. g of substance X from a gas at 100°C to a solid at -50. °C. Assume X has a molar mass of 75.0 g/mol.
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apchem112110 - David Kim Period 7-8 APCHEM 11/21/10 38....

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