58.9 kg in stones and pounds

48 Chapter 1 Matter and Energy

1.15 Express the answers to the following calculations with the proper number of significant figures and with the correct units.

(a) 10.00 L

(20.90 kg − 12.90 kg)

(b) (3.0 cm)3 45.82 g

(0.859 cm)3 0.64 g− ÷ 2

(Assume that the 2 with no units is an exact number.) (c) (0.35 m × 0.55 m) + 25.2 m2

1.16 Express the answers to the following calculations with the proper number of significant figures and with the correct units. (a) (0.25 m/s) × (45.77 s) + 5.0 m

(b) (62.9 gal − 58.9 gal)

2.523 lb

(c) (9.0 cm × 15.1 cm × 10.5 cm) + 75.7 cm3

1.17 Round each of the following numbers to three significant figures. (a) 1.2126 (d) 42.186 (b) 0.2045 (e) 0.007101 (c) 1.8351

1.18 Round each of the following numbers to three significant figures. (a) 0.020450 (d) 16.225 (b) 1.3602 × 104 (e) 1.0001 (c) 13.475

1.19 Carry out the following conversions. Report your answers to the correct number of significant figures. (a) 36 mm to m (g) 168 lb to g (b) 357 kg to g (h) 914 qt to L (c) 76.50 mL to L (i) 44.5 cm to in (d) 0.0084670 m to cm (j) 236.504 g to lb (e) 597 nm to m (k) 2.0 L to qt (f) 36.5 in to cm

1.20 Carry out the following conversions. Report your answers to the correct number of significant figures. (a) 75.5 km to m (g) 25.6 lb to g (b) 25.7 g to mg (h) 4.005 qt to L (c) 0.516 L to dL (i) 934 cm to in (d) 5.2 cm to m (j) 155 g to lb (e) 0.000000450 m to nm (k) 22.4 L to qt (f) 12 in to cm

1.21 Carry out the following conversions. Report your answers to the correct number of significant figures. (a) 947 m to mi (g) 689 lb to kg (b) 6.74 kg to lb (h) 0.5 qt to mL (c) 250.4 mL to gal (i) 125 cm to ft (d) 2.30 dL to mL (j) 542 mg to lb (e) 0.000450 cm to nm (k) 25 nL to gal (f) 37.5 in to m

1.22 Carry out the following conversions. Report your answers to the correct number of significant figures. (a) 32 cm to ft (g) 2.7 lb to kg (b) 0.579 kg to lb (h) 8.320 qt to mL (c) 22.70 μL to qt (i) 375 km to ft (d) 9212 mm to km (j) 62 g to oz (e) 465 nm to mm (k) 752 mL to gal (f) 4 ft to cm

1.23 Carry out the following conversions. Report your answers to the correct number of significant figures. (a) 375 m/s to ft/min (b) 24.5 cm3 to in3 (c) 19.3 g/mL to lb/in3

1.24 Carry out the following conversions. Report your answers to the correct number of significant figures. (a) 27 ft/s to cm/min (b) 2764 ft3 to m3 (c) 0.927 g/mL to lb/gal

Matter and Its Classification 1.25 How would you classify the following items observed by

Bill and Anna? (a) water in a fountain containing dissolved dye (b) a copper pipe (c) the contents of a balloon after blowing it up by mouth (d) a slice of pizza

1.26 How would you classify the following items observed by Bill and Anna? (a) sand in a volleyball court (b) a baseball bat made entirely of aluminum (c) the contents of a balloon filled from a helium tank (d) a glass filled with a soft drink

1.27 Which of the following are examples of matter? (a) sunlight (b) gasoline (c) automobile exhaust (d) oxygen gas (e) iron pipe

1.28 Which of the following are not examples of matter? (a) light from a fluorescent bulb (b) sand (c) wheelbarrow rolling down a ramp (d) helium balloons (e) heat from a welding torch

1.29 How are elements distinguished from compounds? 1.30 How are homogeneous mixtures distinguished from

heterogeneous mixtures? 1.31 List characteristics of metals. 1.32 List characteristics of nonmetals. 1.33 Name the following elements.

(a) Ti (b) Ta (c) Th (d) Tc (e) Tl 1.34 Name the following elements.

(a) C (e) Cu (b) Ca (f) Cl (c) Cr (g) Cs (d) Co

1.35 Name the following elements. (a) B (b) Ba (c) Be (d) Br (e) Bi

1.36 Name the following elements. (a) S (b) Si (c) Se (d) Sr (e) Sn

1.37 Name the following elements. (a) N (c) Mn (e) Al (b) Fe (d) Mg (f) Cl

1.38 Name the following elements. (a) Be (c) Ni (e) Ti (b) Rb (d) Sc (f) Ne

Questions and Problems 49