12 points a 1 14275 023 14598 1459810 2 b 2 79500 250

# 12 points a 1 14275 023 14598 1459810 2 b 2 79500 250

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(12 points)a.145.75 + (2.3 × 10–1) 142.75 + 0.23 = 145.98 = 1.4598*10*2b.79,500 ÷ (2.5 × 102) 79,500 / 250 = 318 = 3.18*102c.(7.0 × 10–3) – (8.0 × 10–4) 0.007 - 0.0008 = 0.0062 = 6.2*10-3d.(1.0 × 104) × (9.9 × 106) 10,000 * 9,900,000 = 99,000,000,000 = 9.9*1010(Reference: Chang 1.31)1Copyright © 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)(Reference: Chang 1.33)5.Express the results in the proper number of significant figures. (12 points)(Reference: Chang 1.35)6.Carry out the following conversions: (16 points)(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) 1255 m/s * 1 mile / 1609.35m * 60 s/1 min * 60 min/1 hr = 2807.34458 mph => 2807.34 mph(Reference: Chang 1.41)2Copyright © 2017 by Thomas Edison State University. All rights reserved.  #### You've reached the end of your free preview.

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