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CHM121_HW-1

# CHM121_HW-1 - in cm 3 6 a Liquid hydrogen boils at –423...

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Middlesex County College Edison, NJ 08818 CHM 121 SUMMER 2010 Name: HW # 1 Answer all questions. Express your answer in proper units and significant figures. 1. a) Write the following numbers in scientific notation. i) 0 . 000081 ii) 9,500,000,000 b) Find the number of significant figures in each of the following. i) 1 . 004 ii) 8.5001 x 10 -2 iii) 0 . 00087 2. a. Fill in the blanks. (i) 4 . 4 kg = g (ii) 10 . 0 mm = km b. i) Convert 5.0 μ m to pm. ii) Convert 5.4 x 10 -6 g/cm 2 to μ g/mm 2 .

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3. Calculate the following and express your answer in correct significant figures. a. 3.54 x 10 -10 + 2.68 x 10 -12 b. 0.0070(3.45 x 10 -7 ) c. (12.125 + 0.530 + 71.4) 4. A small metal sphere has a mass of 75 . 0 g. When the sphere is submerged in a graduated cylinder containing water, the water level rises from 10 . 0 cm 3 to 20 . 0 cm 3 . What is the density of the metal ? 5. A 0.375 kg sample of methylene chloride has a density of 1.326 g/cm 3 . Calculate its volume in cm

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Unformatted text preview: in cm 3 . 6. a. Liquid hydrogen boils at –423 ° F. Express this temperature on the Kelvin scale. ( ° F= 1.8 x ° C+32, ° C= ( ° F-32)/1.8, K= ° C+273.15) b. The melting point of a certain compound is –40 ° C. Express this temperature in ° F. 7. What is the volume of a cube in cm 3 that has an edge length of 0.010 m. (volume of a cube of side’a’ = a 3 ) 8. The average velocity of oxygen molecules at 1000 ° C is 8.0 x 10 4 cm/s. Express this in mi/h. ( 1 mi = 160.9 m, 1h = 60 min, 1min = 60s). 9. How many 325 mg aspirin tablets can be made from 32.5 kg of aspirin ? 10. A metal has a density of 4.55g/cm 3 . A sample of the metal has the shape of a cylinder with a circular cross-section. The cylinder is 7.55 cm long and has a mass of 153.20 g. Calculate the diameter of the cylinder (vol. of cylinder = ∏ r 2 h, ∏ = 3.14)...
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CHM121_HW-1 - in cm 3 6 a Liquid hydrogen boils at –423...

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