Week 3 Text Exercises- Part II - Week 3 Text Exercises Part...

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Week 3 Text Exercises, Part II Exercise 82 in Ch. 10 List the following elements in order of increasing electronegativity: Ba, N, F, Si, Cs Answer : Cs (Cesium), Ba (Barium), Si (Silicon), N (Nitrogen), F (Fluorine). Exercise 132 in Ch. 11 Aerosol cans carry clear warnings against incineration because of the high pressures that can develop upon heating. Suppose a can contains a residual amount of gas at a pressure of 755 mm Hg and a temperature of 25 °C. What would the pressure be if the can were heated to 1155 °C? Answer: Residual pressure: 755 mm Hg = 0.993 atm Final pressure = ? Start temperature = 25 °C = 298 K Final temperature = 1155 °C = 1428 K Since the volume in the can then: P1/T1 = P2/T2 P2=(P1*T2)/T1= (0.993*1428)/298=4.76 atm = 3617.6 mm Hg Exercise 50 in Ch. 12 At the top of Mount. Everest, water boils at 70 °C. Explain why. Answer: Water’s normal boiling point is considered at a pressure of 1 atmosphere—
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Unformatted text preview: is 100 °C. A decrease in atmospheric pressure lowers the boiling point. At the top of Mount Everest the air pressure is about a third of the pressure at sea level. Exercise 104 in Ch. 12 Water does not easily remove grease from dirty hands because grease is nonpolar and water is polar; therefore they are immiscible. The addition of soap, however, results in the removal of the grease. Examine the following structure of soap and explain why soap works. Answer: The chemical composition of soap. Soap has an ionic head and a nonpolar tail. This means that the head of a soap molecule is attracted to water, and the tail is attracted to oil and grease. So when soap comes in contact with oil, it connects the oil to the water and allows it to be washed off....
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