<p> CHM 50 Chapter 1 – Class activity Name …………..</p><p>1. Express the following numbers as scientific notation</p><p>A. 0.000 0015 m = ……………. B. 72 00000 g = ………………..</p><p>2. Express the following numbers as decimals a) 1.52 x 10-4 = ……………….. b) 1.6001 x 104 = ………………………… c) 1 x 10-4 = …………………….. d) 7.78 x 105= ………………………..</p><p>3. Round off or add zeros to the following calculated answers to give three significant figures.</p><p>A. 824.75 cm …………………. B. 0.112486g………………………….</p><p>C. 8.2 L …………………………</p><p>4. State the number of significant figures in each of the following measurements.</p><p>A. 0.030 m (………..) B. 4.050 L (……………)</p><p>C. 0.0008 g (………..) D. 2.80 m (………….)</p><p>5. For each calculation, round off the calculated answer to give a final answer with the correct number of significant figures.</p><p>A. 2.19 x 4.2 = B. E. (0.0105 x 0.060) + 84.0567 =</p><p>C. 12.56 + 4.6 - 3.624 = D. 102 – 40.6 ÷ 10.45 = </p><p>6. Indicate the unit that matches the description.</p><p> a) A mass that is 1000 times greater than 1 gram b) A length that is 1/100 of 1 meter.</p><p> c) A unit of time that is 1/1000 of a second. d) A volume that is 100 times smaller than liter</p><p>7. Without changing the significant figures of the original values, re-write the number using the (closet) correct prefix for the following measurements a. 0.000065g = ………………….. b) 6365920 m = ……………….. c. 0.425 ms = …………………… 1. Complete the table below Problem 1.54 cm to in 1845 kg to lb 2.70 g/cm3 to kg L Given quantity</p><p>Needed quantity</p><p>Possible equalities</p><p>Set-up</p><p>Answers</p><p>2. A bucket contains 4.65 L of water. Write the setup for the problem and calculate the gallons of water in quart.</p><p>3. An injured person loses .50 pints of blood. How many milliliters of blood would that be? Identify the given and needed units given in this problem.</p><p>4. If your pace on a treadmill is 65 meters per minute, how many minutes will it take for you to walk a distance of 7500 feet? 5. How many lb of sugar are in 120 g of candy if the candy is 25.0 % (by mass) sugar? (hint: write the expression of 25.0% to obtain an equality)</p><p>6. The density of octane, a component of gasoline, is 0.702 g/mL. What is the mass, in kg, of 875 mL of octane?</p><p>7. A group of students collected 125 empty aluminum cans to take to the recycling center. If 21 cans make 1.0 lb aluminum, how many liters of aluminum (D=2.70 g/cm3) are obtained from the cans?</p><p>8. An infant acetaminophen suspension contains 80 mg/0.80 mL suspension. The recommended dose is 15 mg/kg body weight. How many mL of this suspension should be given to an infant weighing 14 lb? 9. An ebony carving has a mass of 275 g. If ebony has a specific gravity of 1.33, what is the volume (ml) of the carving?</p>