I) Adding and subtracting: evaluate the following problems and use the rliles to round your answer: 658.0 23.5478 1325.29 1) 2) 3) 32.567 135.0 246.24 238.278 1.4567 98.3 169.01 II) Multiplying and dividing: evaluate the following problems and use the rules to round your answer: 1) 23.7 x 3.8 = 90.06 2) 25.76 x 0.25% = 3) 81.04 + 0.010 = III) Complete the the following problems and round your answer to the proper significant figures: 1) 6.201 cm + 7.4 cm + 0.68 cm% D 6) 1.31 cm x 2.3 cm = 2) 1.6 km + 1.62 km + 2.3 km = 7) 5.7621 m x 6.201 m = 8) 20.3 cm + 7.41 cm = 3) 8.264 g- 7.8 g = 9) 40.002 g + 13.0005 g = 4) 10.4168 m - 6.0 m = 10) 150,000.0 m 5000.01 m% D 5) 12.00 kg + 15.001 kg = IV) Complete the following problems: (Hint: density = mass + volume) 1) A student calculates the density of an unknown solid. The mass is 10.04 grams, and the volume is 8.210 cubic centimeters. How many significant figures should appear in the final answer? 2) A sodium sample has a mass of 80.01 g and a density of 0.970 g/cm. According to the data, to what number of significant figures should the calculated volume of the sodium sample be expressed? Page

what glassware and equipment is being used in these photos?

Bi-214  -->  He-4  +

P2O5 is called ________. N2O4 is called ________

What chemicals do you think are most harmful to your own health? How are you exposed? How could you go about determining whether or not each of these chemicals was harmful to you?

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