Scan_Doc0036 - c. ::r 2 ~ "/' 5. A student performed...

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30 Chapter One Chemical Foundations heterogeneous mixture solution pure substance physical change distillation filtration chromatography paper chromatography compound chemical change element Mixtures can be separated by methods involving only physical changes: Distillation Filtration Chromatography Compounds can be decomposed to elements only through chemical changes. REVIEW QUESTIONS 1. Define and explain the differences between the following terms. a. law and theory b. theory and experiment c. qualitative and quantitative d. hypothesis and theory 2. Is the scientific method suitable for solving problems only in the sciences? Explain. 3. Which of the following statements could be tested by quantitative measurement? a. Ty Cobb was a better hitter than Pete Rose. b. Ivory soap is 99 1 66 % pure. c. Rolaids consumes 47 times its weight in excess stomach acid. 4. For each of the following pieces of glassware, provide a sample measurement and discuss the number of significant figures and uncertainty. J1 a. 11 f T I ! , lOJ I 1 ~ b.
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Unformatted text preview: c. ::r 2 ~ "/' 5. A student performed an analysis of a sample for its calcium content and got the following results: 14.92% 14.88% 14.91 % 14.91 % The actual amount of calcium in the sample is 15.70%. What conclusions can you draw about the accuracy and precision of these results? 6. Compare and contrast the multiplication/division significant figure rule to the sig-nificant figure rule applied for addition/subtraction mathematical operations. 7. Explain how density can be used as a conversion factor to convert the volume of an object to the mass of the object, and vice versa. 8. On which temperature scale CF, °C, or K) does 1 degree represent the smallest change in temperature? 9. Distinguish between physical changes and chemical changes. 10. Why is the separation of mixtures into pure or relatively pure substances so im-portant when performing a chemical analysis?...
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This note was uploaded on 12/13/2010 for the course CHEM 2301 taught by Professor Bill during the Spring '10 term at South Texas College.

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