a_MathRev_1 - 5 What is the mass of a gold bar(in kilograms...

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Chemistry 210 • Math Review 1 1. Carry out the following conversions by DIMENSIONAL ANALYSIS . Express the answers to the correct number of significant figures. (Use the back cover of the book and your notes for some conversion factors.) A) 5.202 x 10 6 μm in B) 0.00233 dm 3 cm 3 C) 500. ng mg D) 750 kHz Hz E) 3.25 x 10 12 dm 3 km 3 F) 75 mi/hr m/s G) 45,000 pm μm H) 9.55x10 7 Hz MHz I) 0.221 mL fl. oz. J) 5.52 gal mL K) 6000 revolutions/min revolutions/hour L) 18.7 g/cm 3 oz/in 3 2. Express the following numbers in proper scientific notation. A) 555,000,000 B) 0.0008600 C) 378.4 x 10 15 D) 0.00987 E) 34.5 F) 15.120 G) 0.000785 x 10 5 H) 3250 I) 23,000,000,000 J) 4 12
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3. Simplify the following expressions to single powers of 10 (without a calculator!): A) 12 3 8 10 10 10 ! ! " = B) 1 7 12 4 10 10 10 10 ! " " = C) 5 2 4 10 ) 10 ( = 4. A chemistry teacher has a height of 70.0 inches. What is the height of that teacher in meters?
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Unformatted text preview: 5. What is the mass of a gold bar (in kilograms) with a weight of 100. oz. ? 6. What is the density of a piece of wood if it has a mass of 1.55x10 6 g and a volume 1.74 m 3 ? 7. What is the volume of a piece of lead that is 73.7 kg ? (D lead = 11.4 g/cm 3 ) 8. What mass of gasoline are you putting in your car if fill up with 45 L ? (D gasoline = 0.671 g/mL) 9. How many significant figures are in each of the following numbers? A) 1.00100 B) 0.00023 C) 1.2500 x 10 − 7 D) 320,000 E) 450,000. F) 95,000 G) 0.0090090 H) 5 cars 10. Express the answers to the following problems in scientific notation with the correct number of sig figs: A. 3.25 x 10 5 x 1.79 x 10-20 B. 45.83 + 7.170 C. 40.00 x 12.591 D. 320,000 x 8.51 E. 0.00359 – 0.0000912 F. 4.55x 10 25 + 3.22 x 10 26 G. 300. x 500. H. 40 x 12.591 I. 1200 + 32,000 J. 48 . 42 65 325 !...
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This note was uploaded on 09/19/2011 for the course CHEM 51423 taught by Professor Martinovic during the Spring '10 term at Skyline College.

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a_MathRev_1 - 5 What is the mass of a gold bar(in kilograms...

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