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## Chapter 2

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**Chapter 2**Practice Problem Answers & Section Assessment Answers**Practice Problems, pg. 20**• 1. m = 147 g v = 41 – 20 = 21 mL D = ? • D = 147 g 21 mL D = 7.0 g/mL**2. v = ?**m = 20 g D = 4 g/mL 4 = 20 v 4v = 20 V = 5 mL**3. m = 20 g**v = 5 cm3 D = ? D = 20 g D = 4 g/cm3 5 cm3 No, the density of Al is 2.7 g/cm3, as stated in the example problem. The density of this cube is 4 g/cm3, so it cannot be Al.**Section 2.1 Assessment**• 4. length: meter mass: kilogram time: second temperature: kelvin • 5. Density is the mass-to-volume ratio of a material. (How much stuff is packed into a given space.)**6. B and C**B, 12g/4cm3 = 3 g/cm3 C, 33g/11mL = 3 g/mL A = 80g/20mL = 4 g/mL (not the same) • 7. Base unit definitions are based on a physical object or process. Derived units use a combination of base units. • 8. It multiplies it by 106.**9. 1000 ms/s**100 cg/g • 10. Oil is less dense than water. • 11. 100 cm**Section 3 Practice Problem Answers**• 11.9 %; 5.66 %; 8.80 % • 6.92 %; 6.29 %; 7.55 % • (a.) 4 (b.) 7 (c.) 5 (d.) 3 • (a.) 5 (b.) 3 (c.) 5 (d.) 2 • (a.) 84,790 kg (b.) 38.54 g (c.) 256.8 cm (d.) 4.936 m**34. (a.) 5.482 x 10-4 g**(b.) 1.368 x 105 kg (c.) 3.087 x 108 mm (d.) 2.014 mL 35. (a.) 142.9 cm (b.) 768 kg (c.) 0.1119 mg 36. (a.) 12.12 cm (b.) 2.10 cm (c.) 2.7 x 103 cm**(a.) 78 m2**(b.) 12 m2 (c.) 2.5 m2 (d.) 81.1 m2 • (a.) 2.0 m/s (b.) 3.00 m/s (c.) 2.00 m/s (d.) 2.9 m/s**4**• The first and second values are very accurate but the third is not. They are not precise. • 0.01307 %; 0.02615 %; 0.1307 % • 8.1956 m because it has the greatest number of significant figures • 5.06000 x 105 cm**Appendix A Practice ProblemsPages 871-872**• 4.0 mL • No, mass A does not equal mass B • (a.) 5.453 x 106 m (b.) 3.008 x 102 kg (c.) 5.36 x 10-3 ng (d.) 1.20325 x 10-2 km (e.) 3.48 x 104 s (f.) 3.3208 x 108 cm (g.) 2.383 x 10-4 ms (h.) 3.048 x 10-1 mL**4. (a.) 8 x 102**(b.) 1.2 x 10-4 (c.) 2.98 x 106 (d.) 6.01 x 10-2 (e.) 1.08 x 102 (f.) 1.36 x 10-3 (g.) 6.791 x 105 (h.) 8.691 x 10-2**5. (a.) 8 x 108**(b.) 8 x 106 (c.) 1.5 x 102 (d.) 9 x 10-6 (e.) 2 x 101 (f.) 3 x 10-2 (g.) 2 x 102 (h.) 4 x 10-7**6. (a.) 9.6 x 104**(b.) 1.55 x 10-1 (c.) 1.5 x 10-4 (d.) 5.84 x 10-4 (e.) 1.88 x 101 (f.) 3.6 (g.) 2.4 x 1013 (h.) 8.5 x 108**5.99 %; 4.63 %; 3.81 %**• 3.91 %; 2.34 %; 2.34 % 11. (a.) 6 (b.) 2 (c.) 3 (d.) 8 (e.) 4 (f.) 3 (g.) 4 (h.) 3**(a.) 0.00308**(b.) 3.08 (c.) 5810 (d.) 34.6 • (a.) 5.832 x 10-3 (b.) 3.86808 x 105 (c.) 5.800 x10-4 (d.) 2.086 x 103**14. (a.) 103.8**(b.) 0.167 (c.) 705.2 (d.) 8.00 (e.) 2.223 (f.) 21.8 (g.) 462.9 (h.) 4.81 x 102**15. (a.) 410**(b.) 0.021 (c.) 604 (d.) 2.94 (e.) 1.426 (f.) 15.3**Chapter Review, pg. 50 - 51**• The first one; placeholder • 3.448 and 3.450 • The number that has the fewest digits to the right of the decimal point; it is less precise • 3.72; it has the smaller number of sig. figs • 1 g/mL • 1.5 g/mL • 3.0 mL**a.) 4.5384 x 10-3 mm**b.) 3.054 x 10-2 g c.) 4.38904 x 105 s d.) 7.0043 x 109 g • a.) 8,348,000 km b.) 3402 g c.) 0.0076352 kg d.) 0.0000302 s**78. a.) 9.6 x 108 km2**b.) 9.99 x 10-9 m2 c.) 1.8 x 10-1 m2 • a.) 1 kg/103 g b.) 103 g/1 kg c.) 10-3 m/1 mm**(a.) 5.70 x 103**(b.) 0.0437 (c.) 783,000 (d.) 0.0453 (e.) 1000 (f.) 37.5 • (a.) 5.5% (b.) 0% (c.) 3.6% (d.) 7.3% • (a.) 1.12% (b.) 0.446% (c.) 0.446% (d.) 0.223%**a.) 431,800 kg**b.) 10,240 mg c.) 1.035 m d.) 0.004384 cm e.) 0.0007810 mL f.) 0.009864 cg 84. a.) 0.00321 g b.) 3.88 kg c.) 219,000 m d.) 25.4 L e.) 0.0876 cm f.) 0.00311 mg**a.) 7.63 x 10 4**b.) 8.20 x 10-3 c.) 74.8 dm3 d.) 13.82 cm • a.) mercury b.) wood c.) iron d.) lead 87. Graph should show a straight line with a slope of 2.7 g/mL.