Express the answers to the following calculations in scientific notation 12

# Express the answers to the following calculations in

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Express the answers to the following calculations in scientific notation: (12 points) a. 145.75 + (2.3 × 10 –1 ) =145.98= 1.4598*10 2 b. 79,500 ÷ (2.5 × 10 2 ) =318= 3.2*10 2 c. (7.0 × 10 –3 ) – (8.0 × 10 –4 ) =.0062= 6.2*10 -2 d. (1.0 × 10 4 ) × (9.9 × 10 6 ) =99000000000= 9.9*10 10 (Reference: Chang 1.31) 1 Copyright © 2017 by Thomas Edison State University . All rights reserved.
4.What is the number of significant figures in each of the following measurements? (8 points) a. 4867 mi 4 b. 56 mL 2 c. 60,104 ton 5 d. 2900 g 4 e. 40.2 g/cm 3 3 f. 0.0000003 cm 1 g. 0.7 min 1 h. 4.6 × 10 19 atoms 2 (Reference: Chang 1.33) 5. Express the results in the proper number of significant figures. (12 points) a. 5.6792 m + 0.6 m + 4.33 m =10.6092m= 10.6m b. 3.70 g – 2.9133 g =0.7867g= 0.787g c. 4.51 cm × 3.6666 cm =16.536366cm 2= 16.5cm 2 d. (3 × 10 4 g + 6.827g)/(0.043 cm 3 – 0.021 cm 3 ) =1363946.682g/cm 3 = 1.36*10 6 g/cm 3 (Reference: Chang 1.35) 6. Carry out the following conversions: (16 points) a. 22.6 m to dm 226 dm b. 25.4 mg to kilograms 0.0000254 kg c. 556 mL to liters 0.556 liters d. 10.6 kg/m 3 to g/cm 3 0.0106 g/cm 3 (Reference: Chang 1.39) 7. The average speed of helium at 25°C is 1255 m/s. Convert this speed to miles per hour (mph). (4 points) (Reference: Chang 1.41) 2807.355 mph 2

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• Fall '15
• Chemistry, Chemical substance, Chemical compound, Edison State University

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