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Unformatted text preview: 3. (A) Write out the following numbers in scientific notation: 2050.0 ____ 2.050 x 10 3 0.00002050 _____ 2.050 x 105 1.0 ______ 1.0 x 10 0.727 ______ 7.27 x 101 (B) State the number of significant figures in each of the following: 2001 __ 4 ___ 186,000.0 __ 7 ___ 6.62 x 1027 ___ 3 __ 1500 ___ 2 or 4. It is ambiguous. Thats why we use scientific notation. 4. A cube of iron has a mass of 15.37 g. If each side of the cube has dimensions of 1.25 cm, what is the density of iron? A) 1.23 g/cm 3 B) 1.92 g/cm 3 C) 3.00 g/cm 3 D) 7.87 g/cm 3 E) 10.5 g/cm 3 5. Which of the following substances is NOT an element? A) Cr B) Co C) Cd D) CO E) Cl...
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 Fall '08
 Cook
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