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

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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 andexplain thedifferences between thefollowing terms. a. law and theory b. theory and experiment c. qualitative andquantitative d. hypothesis and theory 2. Isthescientific method suitable forsolving problems onlyinthesciences? Explain. 3. Which ofthefollowing statements could be tested byquantitative measurement? a. TyCobb was abetter hitter than Pete Rose. b. Ivory soap is99 1 66 %pure. c. Rolaids consumes 47times itsweight inexcess stomach acid. 4. Foreach ofthefollowing pieces ofglassware, provide asample measurement and discuss thenumber ofsignificant figures anduncertainty.
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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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