WS 01 - Key

# WS 01 - Key - What is its density in kg/m 3 3 If you used...

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Name: _____________________________ Quiz Section:_______ CHEM 120A – Autumn 2011 Worksheet #1 1. Perform the following calculations giving your answer with the correct number of significant figures a. 890 g + 0.874 g = 890 g b. 1.04 L - 963 mL = 80 mL c. 4.51 cm x 0.35695 cm = 1.61 cm 2 d. 3.26 x 10 -3 / 0.35 x 10 -5 = 930 e. (3456 + 1.2589)/8.45 x 10 -2 = 4.09 x 10 4 f. 4326 . 0 705 . 80 623 . 0 470 . 0 1 . 3 526 . 2 = 188.1 2. Use dimensional analysis to answer the following questions. a. The speed of sound in air at 20⁰C is 1,126 ft/s. What is this speed in km/h? b. The density of aluminum is 2.7 g/cm 3 .
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Unformatted text preview: What is its density in kg/m 3 ? 3. If you used the 2100 kcal you expend in energy in one day to heat 50,000. g of water at 20.0 °C, what would be the new temperature of the water in °F? 4. Calculate the specific heat of a metal if 5.00 g of the unknown metal absorbs 133 J and the temperature rises from 25.2 °C to 55.1 °C? 5. You are given a piece of metal that weighs 49.8 g. After placing the metal in a graduated cylinder that initially contained 25.6 mL of water you find the volume is 31.2 mL. What is the density of the metal?...
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