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Chem 2070 discussion

# Chem 2070 discussion - 1 km^2 e 517762 m^2 517800 m^2 f...

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Chem 2070 discussion #1 1. significant figures a. 2008 i. Last digit “8” is uncertain ii. It can be either a 7 or 9 iii. 4 total sig figs b. 2000 i. Ambiguous as to # of sig figs ii. 2000. clarifies that there are 4 sig figs iii. To write 2000 with 3 sig figs: 2.00 x 10^3 iv. Scientific notation is used a lot for sig figs v. If necessary, do normal rounding of digits to obtain the correct number of sig figs needed 2. dimensional analysis a. question: covert 2.000 miles^2 to meters^2 b. (1 mile = 1.609 meters) c. 2.000 mi^2 (1.609 km)^2 (1000 m)^2 d. 1 mi^2
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Unformatted text preview: 1 km^2 e. 517762 m^2 517800 m^2 f. 2.000 has 4 sig figs, so the answer must have 4 as well Chapter 1, #71 The total volume of seawater on Earth is 330,000,000 mi^3. Seawater is 3.5% NaCl. The density of seawater is 1.03 g/mL or 1.03 g/cm^3. What is the mass, in tons, of NaCl on Earth? (1 pound = 454 grams) (1 ton = 2000 pounds) 330,000,000 mi^3 (1.609 km)^3 (1000 cm)^3 1.03 gram 1 pound 1 ton 1 mi^3 1 km^3 1 cm^3 454 g 2000 lb Take the result x 3.5 = 5.5 x 10^16 tons of NaCl on Earth...
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