211chp1 - Chapter 1 Homework 8/25/08 7. You are told...

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Unformatted text preview: Chapter 1 Homework 8/25/08 7. You are told nothing about the accuracy of the method and, so, should assume that the accuracy is limited by the “9” in 1900. Thus, the age is only accurate to ±100 years. For this reason the passing of twenty years doesn’t change the perceived age of the object. It remains 1900 years old. 12. a) homogeneous mixture c) pure substance b) heterogeneous mixture d) heterogeneous mixture (beach) (or pure substance (washed)) 20. a) chemical b) physical c) physical d) physical 22. Let it evaporate. If salt is present a white solid would remain. 24. a) 63.5 mL d) 4.23 mm 3 f) 0.36 ng b) 6.5 μ s e) 0.125 mg g) 6.54 μ s c) 0.95 mm 26. a) ºC = (87 ºF – 32 ºF) & ¡ ¢ £ ¤ ¥ F º 9 C º 5 = 30 ºC (or 31 ºC) b) K = 25 ºC + 273 K = 298 K ºF = & ¡ ¢ £ ¤ ¥ C º 5 F º 9 (25 ºC) + 32 ºF = 77 ºF c) ºC = (175 ºF – 32 ºF)...
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This note was uploaded on 02/12/2012 for the course CHM 211 taught by Professor Staff during the Fall '08 term at Marshall.

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211chp1 - Chapter 1 Homework 8/25/08 7. You are told...

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