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Exam Review Questions for General Chemistry I | CH 221, Study notes of Chemistry

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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Uploaded on 08/18/2009

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CH 221 – Ziegler KEY CONCEPTS Fall 05
Chapter 1 10th ed
Class period 1 – Reading pp. 1-12.
1. From its composition, identify a sample of matter as an element,
compound, or mixture. Problem 1.15.
2. For any element in Table 1.2, given the element name, write the
atomic symbol, or vice versa. Problems 1.11, 1.13.
3. Classify a mixture as a solution or heterogeneous. Problem 1.1,
1.9.
4. Determine whether a property of matter is a physical or chemical
property. Problem 1.2, 1.20
Class period 2 – Reading pp. 14-17, 20-25(m).
5. State the appropriate SI/metric unit for a given quantity. Or,
given a unit, state the quantity being specified. Problem 1.3, 1.63
6. Convert between oF, oC, and K. Problem 1.33.
7. Distinguish between precision and accuracy for measured
numbers. Problems 1.4, 1.61
8. Determine the number of significant figures in a measured
quantity. Problems 1.5, 1.37, 1.39
9. Determine the number of significant figures in a calculated
quantity. Problem 1.41, 1.42
Class period 3 – Reading pp. 25(m) – 28 (m).
10. Use conversion factors to change the units of a measured
quantity. Problems 1.45, 1.47, 1.49
11. Relate density to mass and volume. Problems 1.31, 1.56, 1.66,
1.69 a), b).
NOTE: Class periods above are for the MWF lecture sections. If you are
in the MR lecture, the class periods break down as below. Adjust your
reading accordingly.
Class Period Key Concepts
1 1-7
2 8-11
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Chapter 1 10 th^ ed Class period 1 – Reading pp. 1-12.

  1. From its composition, identify a sample of matter as an element, compound, or mixture. Problem 1.15.
  2. For any element in Table 1.2, given the element name, write the atomic symbol, or vice versa. Problems 1.11, 1.13.
  3. Classify a mixture as a solution or heterogeneous. Problem 1.1, 1.9.
  4. Determine whether a property of matter is a physical or chemical property. Problem 1.2, 1. Class period 2 – Reading pp. 14-17, 20-25(m).
  5. State the appropriate SI/metric unit for a given quantity. Or, given a unit, state the quantity being specified. Problem 1.3, 1.
  6. Convert between oF, oC, and K. Problem 1.33.
  7. Distinguish between precision and accuracy for measured numbers. Problems 1.4, 1.
  8. Determine the number of significant figures in a measured quantity. Problems 1.5, 1.37, 1.
  9. Determine the number of significant figures in a calculated quantity. Problem 1.41, 1. Class period 3 – Reading pp. 25(m) – 28 (m).
  10. Use conversion factors to change the units of a measured quantity. Problems 1.45, 1.47, 1.
  11. Relate density to mass and volume. Problems 1.31, 1.56, 1.66, 1.69 a), b). NOTE: Class periods above are for the MWF lecture sections. If you are in the MR lecture, the class periods break down as below. Adjust your reading accordingly. Class Period Key Concepts 1 1- 2 8-

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.