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Material Type: Notes; Professor: Ziegler; Class: General Chemistry I; Subject: Chemistry ; University: Central Oregon Community College; Term: Unknown 1989;
Typology: Study notes
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Chapter 1 10 th^ ed Class period 1 – Reading pp. 1-12.
Chapter 1 10 th^ ed Answers to assigned problems: For all problems in the book whose numbers appear in Red Ink, please see Appendix A of your text which starts on page A-1. 1.2 Chemical change 1.20 a) chemical b)physical c) physical d) physical (the production of soot is a chemical change but the deposition of soot is a physical change.) 1.3 a) time b) density c) length d) area e) temperature f) volume g) temperature 1.4 Measurements (darts) that are close to each other are precise. Measurements that are close to the “true value” are accurate. a) Figure ii = both accurate and precise. b) Figure I = precise but not accurate, c) Figure iii = imprecise but their average value or geometric center point is close to the bull’s eye so their average is very accurate. 1.61 a) Student I: ave. = 22.51 ; Student II ave. = 22.61 Student I is more accurate. b) average deviations: (student I) 0.02; (student II) 0.02 the two sets show the same precision, even though set I is more accurate. 1.42 -2.3 x 10^2 1.56 470 ft. 1.66 There are lots of ways to do this. Here’s one way: Select a common unit for comparison, say, the cm. Then recall that 1 in ~ 2. cm, 1 m = 100 cm. Also, it is helpful to notice that 57 cm is close to 50 cm which is about half as big as the 1.1 m length. 14 in. is about 1. times 10 inches which is easier to convert to cm, (25 cm) so 14 in is around (25 + 12) cm. Sometimes you have to do the conversions (like when the estimation method isn’t good enough), and sometimes you don’t (as was the case here). It is useful to make these ball-park estimates so that you can judge whether your answer is right when you do go through with the more formal conversions.