First Practice 160

First Practice 160 - 1. Consider a heating curve for a...

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1. Consider a heating curve for a sample of water. Assume that heat is added to the sample at a constant rate. The specific heat capacity of ice is 2.09 J/g°C. The heat of fusion of ice is 6.02 kJ/mol. X. What is the slope of the heating curve’s portion that corresponds to warming 25.0 grams of ice? Y. What is the slope of the heating curve’s portion that corresponds to melting 25.0 grams of ice? X Y A. 0 8.35 kJ/°C B. 0 0.120 °C/kJ C. 0.0191°C/J 8.35 kJ/°C D. 52.3 J/°C 0.120 °C/kJ E. 52.3 J/°C 8.35 kJ/°C F. 0.0191°C/J 0.120 °C/kJ G. 0.0191°C/J 0 H. 52.3 J/°C 0 2. The normal sublimation point of dry ice, CO 2 (s), is –78.5 o C. The enthalpy or heat of sublimation of carbon dioxide is 26.2 kJ/mol. Calculate the vapor pressure of CO 2 (s) at –63.0 o C. A. 0.30 atm B. 1.0 atm C. 1.3 atm D. 2.0 atm E. 2.3 atm F. 3.0 atm G. 3.3 atm H. 4.0 atm I. 4.3 atm J. 5.0 atm 3. For which of the following choices is the solute considered to be soluble in the solvent? Solute Solvent X. I 2 C 6 H 6 (benzene) Y. KCl CCl 4 Z. CH 3 OH H 2 O A. X only B. Y only C. Z only D. X and Y E. X and Z F. Y and Z G. X, Y, and Z H. none of them 4. A new element with molar mass 262 g/mol is found to crystallize with a body-centered unit cell. If its density is 4.62 g/cm 3 , what is its atomic radius? A. 116 pm B. 125 pm C. 211 pm D. 248 pm E. 321 pm F. 386 pm G. 458 pm H. 500 pm I. 600 pm J. 750 pm 5. Silver has a density of 10.52 g/cm 3 and forms a face-centered cubic unit cell. What would its density in g/cm 3 be if the unit cell were body-centered cubic? A. 2.82 B. 4.29 C. 4.83 D. 5.25 E. 6.44 F. 9.66 G. 12.47 H. 16.38 I. 19.32 J. 38.63 6. A metallic cubic unit cell has atoms at six corners, at five edges, and at five faces. How many atoms are in a unit cell? A. 3 B. 3 ½ C. 4 D. 4 ½ E. 5 F. 5 ½ G. 6 H. 6 ½ I. 7 J. 16 7. What types of solids will SiO
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First Practice 160 - 1. Consider a heating curve for a...

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