Question

HOME WORK 1 (from McMurry and Fey 6th edition) QTNS: 1.70, 1.64, 1.74, 1.79(b), 1.92, 1.98 1) Which quantity in each of the following pairs is larger? (a) (b) (c) 5.63 x 106 cm or 6.02 x 101 km 46 μs or 3.2 x 10-2 ms 200,098 g or 17 x 101 kg 2) How many significant figures are in each of the following measurements? 35.0445 g (b) 59.0001 cm (a) (d) 0.00450 m (c) 0.03003 kg (f) 3.8200 x 103 L (e) 67,000 m2 3) Express the following measurements in scientific notation (a) 453.32 mg (b)0.000042 mL (c) 667,000 g 4) Express the results of the following calculations with the correct number of significant figures: 3.41-0.23 (a) 5.233 5.556 x 2.3 4.223-0.08 x 0.205 (b) 5) Tungsten, the element used to make filaments in light bulbs, has a melting point of 61920F. Convert this temperature to degrees Celcius and to kelvin. 6) Aspirin has a density of 1.40 g/cm3. What is the volume in cubic centimeters of an aspirin tablet weighing 250 mg? Of a tablet weighing 500 lb?

Answer 1

a) 5.63 times 10^6 cm rightarrow 5 .63 times 10^4 m rightarrow 56.3 km 6.02 times 10 ' cm rightarrow 60.2 km since 60.2 km > 56.3 km therefore 6.02 times 10^1 km > 5.63 times 10^6 cm b) 46 mu s rightarrow 46 times 10^-6 s 3.2 times 10^-2 m s rightarrow 3.2 times 10^-5 s rightarrow 32 times 10^-6 s since 46 times 10^-6 s > 32 times 10^-6 s therefore 46 mu s > 3.2 times 10^-2 m s c) 200,098 g or 17 times 10^1 kg 200,098 g rightarrow 200.098 kg 17 times 10^1 kg rightarrow 170 kg since 200,098 > 170 kg therefore 200,098 > 17 times 10^1 kg \r\n a) 35.0445 g = 6 b) 59.0001 cm = 6 c) 0.03003 kg = 6 d) 0.00450 m = 6 e) 67,000 m^2 = 2 f) 3.9200 times 10^3 L = 5 they have units thus they are measured values thus , the right zeroes after decimals count since they show extent of precision 3) a) 453.32 mg = 453.32 times 10^-3 g = 4.5332 times 10^-1 g