BOBO 0dHHHHHH H  _ 4Z-jFLOM!` pzxHH@Rg(HH(dh Hl /dz<606>0H/H/ (zd0@L   L qBDSET q q re     (m ,'  0( r (  3 4 V W   G H         K L     ! , 8 B L X b m n   P Q     " 7 O   , - t     " F h       O P m n [ g s    # ; P _ r z   2      @A    n    # q  r( "    Homework Chapter 2 Homework 2.1 Scientific Method 1. What is the scientific method? 2. Which of the following are quantitative? a) the liquid floats on water b) the metal is malleable c) the liquid has a temperature of 55.6oC 3. How do hypotheses and theories differ? 4. How are models related to theories and hypotheses? 5. What are the components of the system in the graduated cylinder shown on page 38? 6. How does quantitative information differ from qualitative information? 7. Define hypothesis. Homework 2.2 Density 1. Why are standards needed for measured quantities? 2. Label each of the following measurements by the quantity each represents. For instance, a measurement of 10/6 kg/m3 represents density. Refer to table 2-1 and 2-3 in your textbook. a) 5.0 g/mL b) 37 s c) 47 J d) 39.56 g e) 25.3 cm3 f) 325 ms g) 500 m2 h) 30.23 mL i) 2.7 mg j) 0.005 L 3. What is the density of a block of marble that "occupies 310. cm3 and has a mass of 853 g? (2.75 g/cm3) soln 4. Diamond has a density of 3.26 g/cm3. What is the mass of a diamond that has a volume of 0.350 cm3? (1.14g) soln 5. What is the volume of a sample of liquid mercury that has a mass of 76.2 g given that the density of mercury is 13.6 g/mL? (5.60 mL) soln Homework 2.3 Conversion Factors 1. Express a length of 16.45 m in a) cm (1645 cm) soln b) km (0.01645 km) soln showing all work, given information, conversion factors and cancellation of units. 2. Express a mass of 0.014 mg in g, showing all work, given information, conversion factors and cancellation of units: (0.000 014g) soln 3. Write the conversion factors to represent the following equalities: a) 1 in = 2.54 cm b) 1 microg = 0.000 001g c) 1 Mm = 1 000 000 m 4. Convert the following showing all work, given information, conversion factors and cancellation of units: a) 10.5 g into kg (0.0105 kg ) soln b) 1.57 km into m ( 1570 m ) soln c) 3.54 microg into g ( 0.000 003 54 g ) soln d) 3.5 mol into micromol ( 3 500 000 micromol ) soln e) 1.2 L into mL ( 1200 mL ) soln f) 548.6 mL into cm3 ( 548.6 cm3 ) soln 5. For each of the following show given information, conversion factors, set up, unit cancellation and the answer boxed. a) What is the density of an 84.7 g sample of an unknown substance if the sample occupies 49.6 cm3? (1.71 g/cm3) b) What volume would be occupies by 7.75 g of this same substance? ( 4.53 cm3) 6. Define conversion factor. 2.4 Using Scientific Measurements 1. The density of copper is listed as 8.94 g/cm3. Wo students each make three density determinations of samples of the substances. student A's results are 7.3 g/mL, 9.4 g/mL, and 8.3 g/mL. 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