Chapter 2 Chapter 2

Practice Problem Answers Practice Problem Answers

& &

Section Assessment AnswersSection Assessment Answers

Practice Problems, pg. 20Practice Problems, pg. 20

1. m = 147 g1. m = 147 g v = 41 – 20 = 21 mLv = 41 – 20 = 21 mL D = ?D = ?

D = D = 147 g147 g 21 mL21 mL

D = 7.0 g/mLD = 7.0 g/mL

2. v = ?2. v = ?

m = 20 gm = 20 g

D = 4 g/mLD = 4 g/mL

4 = 4 = 2020

v v

4v = 204v = 20

V = 5 mLV = 5 mL

3. m = 20 g3. m = 20 g

v = 5 cmv = 5 cm33

D = ?D = ?

D = D = 20 g 20 g D = 4 g/cm D = 4 g/cm33

5 cm5 cm33

No, the density of Al is 2.7 g/cmNo, the density of Al is 2.7 g/cm33, as , as stated in the example problem. The stated in the example problem. The density of this cube is 4 g/cmdensity of this cube is 4 g/cm3, 3, so it so it cannot be Al.cannot be Al.

Section 2.1 AssessmentSection 2.1 Assessment

4. length: meter4. length: meter

mass: kilogrammass: kilogram

time: secondtime: second

temperature: kelvintemperature: kelvin

5. Density is the mass-to-volume 5. Density is the mass-to-volume ratio of a material. (How much stuff ratio of a material. (How much stuff is packed into a given space.)is packed into a given space.)

6. 6. B B and and CC

B, 12g/4cmB, 12g/4cm33 = 3 g/cm = 3 g/cm33

C, 33g/11mL = 3 g/mLC, 33g/11mL = 3 g/mL

A = 80g/20mL = 4 g/mL (not the same)A = 80g/20mL = 4 g/mL (not the same)

7. Base unit definitions are based on a 7. Base unit definitions are based on a physical object or process. Derived units physical object or process. Derived units use a combination of base units.use a combination of base units.

8. It multiplies it by 108. It multiplies it by 1066..

9. 1000 ms/s9. 1000 ms/s

100 cg/g100 cg/g

10. Oil is less dense than water.10. Oil is less dense than water.

11. 100 cm11. 100 cm

Section 3 Practice Problem Section 3 Practice Problem AnswersAnswers

29.29. 11.9 %; 5.66 %; 8.80 %11.9 %; 5.66 %; 8.80 %

30.30. 6.92 %; 6.29 %; 7.55 %6.92 %; 6.29 %; 7.55 %

31.31. (a.) 4(a.) 4 (b.) 7(b.) 7 (c.) 5(c.) 5 (d.) 3(d.) 3

32.32. (a.) 5(a.) 5 (b.) 3(b.) 3 (c.) 5(c.) 5 (d.) 2(d.) 2

33.33. (a.) 84,790 kg(a.) 84,790 kg

(b.) 38.54 g(b.) 38.54 g

(c.) 256.8 cm(c.) 256.8 cm

(d.) 4.936 m(d.) 4.936 m

34. (a.) 5.482 x 1034. (a.) 5.482 x 10-4-4 g g

(b.) 1.368 x 10(b.) 1.368 x 1055 kg kg

(c.) 3.087 x 10(c.) 3.087 x 1088 mm mm

(d.) 2.014 mL(d.) 2.014 mL

35. (a.) 142.9 cm35. (a.) 142.9 cm

(b.) 768 kg(b.) 768 kg

(c.) 0.1119 mg (c.) 0.1119 mg

36. (a.) 12.12 cm36. (a.) 12.12 cm

(b.) 2.10 cm(b.) 2.10 cm

(c.) 2.7 x 10(c.) 2.7 x 1033 cm cm

37.37. (a.) 78 m(a.) 78 m22

(b.) 12 m(b.) 12 m22

(c.) 2.5 m(c.) 2.5 m22

(d.) 81.1 m(d.) 81.1 m22

38.38. (a.) 2.0 m/s(a.) 2.0 m/s

(b.) 3.00 m/s(b.) 3.00 m/s

(c.) 2.00 m/s(c.) 2.00 m/s

(d.) 2.9 m/s(d.) 2.9 m/s

39.39. 44

40.40. The first and second values are very The first and second values are very accurate but the third is not. They accurate but the third is not. They are not precise.are not precise.

41.41. 0.01307 %; 0.02615 %; 0.1307 %0.01307 %; 0.02615 %; 0.1307 %

42.42. 8.1956 m because it has the 8.1956 m because it has the greatest number of significant greatest number of significant figuresfigures

43.43. 5.06000 x 105.06000 x 1055 cm cm

Appendix A Practice ProblemsAppendix A Practice ProblemsPages 871-872Pages 871-872

1.1. 4.0 mL4.0 mL2.2. No, mass A does not equal mass BNo, mass A does not equal mass B3.3. (a.) 5.453 x 10(a.) 5.453 x 1066 m m

(b.) 3.008 x 10(b.) 3.008 x 1022 kg kg(c.) 5.36 x 10(c.) 5.36 x 10-3 -3 ngng(d.) 1.20325 x 10(d.) 1.20325 x 10-2-2 km km(e.) 3.48 x 10(e.) 3.48 x 1044 s s(f.) 3.3208 x 10(f.) 3.3208 x 1088 cm cm(g.) 2.383 x 10(g.) 2.383 x 10-4-4 ms ms(h.) 3.048 x 10(h.) 3.048 x 10-1-1 mL mL

4. (a.) 8 x 104. (a.) 8 x 1022

(b.) 1.2 x 10(b.) 1.2 x 10-4-4

(c.) 2.98 x 10(c.) 2.98 x 1066

(d.) 6.01 x 10(d.) 6.01 x 10-2-2

(e.) 1.08 x 10(e.) 1.08 x 1022

(f.) 1.36 x 10(f.) 1.36 x 10-3-3

(g.) 6.791 x 10(g.) 6.791 x 1055

(h.) 8.691 x 10(h.) 8.691 x 10-2-2

5. (a.) 8 x 105. (a.) 8 x 1088

(b.) 8 x 10(b.) 8 x 1066

(c.) 1.5 x 10(c.) 1.5 x 1022

(d.) 9 x 10(d.) 9 x 10-6-6

(e.) 2 x 10(e.) 2 x 1011 (f.) 3 x 10(f.) 3 x 10-2-2

(g.) 2 x 10(g.) 2 x 1022

(h.) 4 x 10(h.) 4 x 10-7-7

6. (a.) 9.6 x 106. (a.) 9.6 x 1044

(b.) 1.55 x 10(b.) 1.55 x 10-1-1

(c.) 1.5 x 10(c.) 1.5 x 10-4-4

(d.) 5.84 x 10(d.) 5.84 x 10-4-4

(e.) 1.88 x 10(e.) 1.88 x 1011 (f.) 3.6(f.) 3.6(g.) 2.4 x 10(g.) 2.4 x 101313

(h.) 8.5 x 10(h.) 8.5 x 1088

9.9. 5.99 %; 4.63 %; 3.81 %5.99 %; 4.63 %; 3.81 %10.10. 3.91 %; 2.34 %; 2.34 %3.91 %; 2.34 %; 2.34 %11. (a.) 611. (a.) 6

(b.) 2(b.) 2(c.) 3(c.) 3

(d.) 8(d.) 8(e.) 4(e.) 4(f.) 3(f.) 3(g.) 4(g.) 4(h.) 3(h.) 3

12.12. (a.) 0.00308(a.) 0.00308(b.) 3.08(b.) 3.08(c.) 5810(c.) 5810(d.) 34.6(d.) 34.6

13.13. (a.) 5.832 x 10(a.) 5.832 x 10-3-3

(b.) 3.86808 x 10(b.) 3.86808 x 1055

(c.) 5.800 x10(c.) 5.800 x10-4-4

(d.) 2.086 x 10(d.) 2.086 x 1033

14. 14. (a.) 103.8(a.) 103.8(b.) 0.167(b.) 0.167(c.) (c.) 705.2705.2

(d.) 8.00(d.) 8.00(e.) 2.223(e.) 2.223(f.) 21.8(f.) 21.8(g.) 462.9(g.) 462.9(h.) 4.81 x 10(h.) 4.81 x 1022

15. (a.) 41015. (a.) 410

(b.) 0.021(b.) 0.021

(c.) (c.) 604604

(d.) 2.94(d.) 2.94

(e.) 1.426(e.) 1.426

(f.) 15.3(f.) 15.3

Chapter Review, pg. 50 - 51Chapter Review, pg. 50 - 51

65.65. The first one; placeholderThe first one; placeholder66.66. 3.448 and 3.4503.448 and 3.45067.67. The number that has the fewest The number that has the fewest

digits to the right of the decimal digits to the right of the decimal point; it is less precisepoint; it is less precise

68.68. 3.72; it has the smaller number of 3.72; it has the smaller number of sig. figssig. figs

72.72. 1 g/mL1 g/mL73.73. 1.5 g/mL1.5 g/mL74.74. 3.0 mL3.0 mL

75.75. a.) 4.5384 x 10a.) 4.5384 x 10-3-3 mm mm

b.) 3.054 x 10b.) 3.054 x 10-2-2 g g

c.) 4.38904 x 10c.) 4.38904 x 1055 s s

d.) 7.0043 x 10d.) 7.0043 x 1099 g g

76.76. a.) 8,348,000 kma.) 8,348,000 km

b.) 3402 gb.) 3402 g

c.) 0.0076352 kgc.) 0.0076352 kg

d.) 0.0000302 sd.) 0.0000302 s

78. a.) 9.6 x 1078. a.) 9.6 x 108 8 kmkm22

b.) 9.99 x 10b.) 9.99 x 10-9-9 m m22

c.) 1.8 x 10c.) 1.8 x 10-1-1 m m22

79.79. a.) 1 kg/10a.) 1 kg/1033 g g

b.) 10b.) 1033 g/1 kg g/1 kg

c.) 10c.) 10-3 -3 m/1 mmm/1 mm

80.80. (a.) 5.70 x 10(a.) 5.70 x 1033

(b.) 0.0437(b.) 0.0437 (c.) 783,000(c.) 783,000 (d.) 0.0453(d.) 0.0453 (e.) 1000(e.) 1000 (f.) 37.5(f.) 37.581.81. (a.) 5.5%(a.) 5.5%

(b.) 0%(b.) 0%(c.) 3.6%(c.) 3.6%(d.) 7.3%(d.) 7.3%

82.82. (a.) 1.12%(a.) 1.12%(b.) 0.446%(b.) 0.446%(c.) 0.446%(c.) 0.446%(d.) 0.223%(d.) 0.223%

83.83. a.) 431,800 kga.) 431,800 kg

b.) 10,240 mgb.) 10,240 mg

c.) 1.035 mc.) 1.035 m

d.) 0.004384 cmd.) 0.004384 cm

e.) 0.0007810 mLe.) 0.0007810 mL

f.) 0.009864 cgf.) 0.009864 cg

84. a.) 0.00321 g84. a.) 0.00321 g

b.) 3.88 kgb.) 3.88 kg

c.) 219,000 mc.) 219,000 m

d.) 25.4 Ld.) 25.4 L

e.) 0.0876 cme.) 0.0876 cm

f.) 0.00311 mgf.) 0.00311 mg

85.85. a.) 7.63 x 10 a.) 7.63 x 10 44

b.) 8.20 x 10b.) 8.20 x 10-3-3

c.) 74.8 dmc.) 74.8 dm33

d.) 13.82 cmd.) 13.82 cm

86.86. a.) mercurya.) mercury

b.) woodb.) wood

c.) ironc.) iron

d.) leadd.) lead

87. Graph should show a straight line 87. Graph should show a straight line with a slope of 2.7 g/mL. with a slope of 2.7 g/mL.