CHEM 10113, Quiz 1 August 31, All answers must use the correct number of significant figures, and must show units!

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1 CHEM 10113, Quiz 1 August 31, 2011 Name (please print) All answers must use the correct number of significant figures, and must show units! 1. (2 points) SHOW ALL WORK. A 34.6 g bar of aluminum occupies 12.8 ml. Calculate the density of aluminum. d = m/v = 34.6/12.8 = 2.70 g/ml 2. (2 points) A 3 g sample of calcium (an electrically conducting white metal that is shiny, relatively soft, melts at 850 C, and boils at 1440 C) was placed into 1.0 L of water at 25 C. The calcium reacted slowly with the water to give bubbles of gaseous hydrogen and a solution of the substance calcium hydroxide. In this description, what physical properties (name 3) and what chemical properties (name 1) are described? Examples of physical properties: conducting, white, shiny, soft, mp, bp, Chemical property: reacts with water to give hydrogen and calcium hydroxide 3. (4 points) SHOW ALL WORK. A 2.00 g sample of zinc oxide (contains only zinc and oxygen) contains 1.61 g of zinc. What mass of oxygen would be contained in a sample that weighs 4.75 g? = 0.39 g O (0.39 g O)/(2.00 g total) = (x g O)/(4.75 g total) (4.75)(0.39)/(2.00) = 0.93 g O Note that this method gives an answer with two sig fig, but other methods may give three sig fig answers, such as finding percentage and multiplying by that number. 4. (2 points) Fill in the blanks. 1 Tg = g 1 L = 10-6 L 1 Mm = 10 6 m 1 fl = L

2 5. (4 points) SHOW ALL WORK. Convert 136 F to K. K = C C = ( F 32)(5/9) Here, C = (136 32)(5/9) = (104)(5/9) = C K = = K (Last significant digit is underlined, for Celsius temp) 5. (5 points) SHOW ALL WORK. The recommended adult dose of ubiquotracin is 3.75 mg/kg of body mass. Calculate the dose in mg for a 142-lb person. (142 lbs person) x (454 g person)/(1 lb person) x (1 kg person)/(1000 g person) x (3.75 mg med)/(1 kg person) = 242 mg med

3 CHEM 10113, Quiz 1 August 30, 2005 Name (please print) All answers must use the correct number of significant figures, and must show units! 1. (2 points) SHOW ALL WORK. A 82.9 g bar of copper occupies 9.27 ml. Calculate the density of aluminum [should say copper!]. d = m/v = 82.9/9.27 = 8.94 g/ml 2. (2 points) A 3 g sample of calcium (an electrically conducting white metal that is shiny, relatively soft, melts at 850 C, and boils at 1440 C) was placed into 1.0 L of water at 25 C. The calcium reacted slowly with the water to give bubbles of gaseous hydrogen and a solution of the substance calcium hydroxide. In this description, what intensive properties (name 3) and what extensive properties (name 1) are described? Examples of intensive properties: conducting, white, shiny, soft, mp, bp, Examples of extensive properties: mass (e.g. 3 g calcium), volume (1.0 L water) 3. (4 points) SHOW ALL WORK. A 2.00 g sample of zinc oxide (contains only zinc and oxygen) contains 0.39 g of oxygen. What mass of zinc would be contained in a sample that weighs 4.75 g? = 1.61 g Zn (1.61 g Zn)/(2.00 g total) = (x g Zn)/(4.75 g total) (1.61)(4.75)/(2.00) = 3.82 g Zn 4. (2 points) Fill in the blanks. 1 gl = 10 9 L 1 dm = 10-1 m 1 cg = 10-2 g 1 pm = m

4 5. (4 points) SHOW ALL WORK. Convert 36.2 F to K. K = C C = ( F 32)(5/9) Here, C = ( )(5/9) = (4.2)(5/9) = 2.33 C K = = K (Last significant digit is underlined, for Celsius temp) 6. (5 points) SHOW ALL WORK. The recommended adult dose of ubiquotracin is 6.00 mg/kg of body mass. Calculate the dose in mg for a 115-lb person. (115 lb person) x (454 g person)/(1 lb person) x (1 kg person)/(1000 g person) x (6.00 mg med)/(1 kg person) = 313 mg med

5 CHEM 10113, Quiz 1 August 30, 2005 Name (please print) All answers must use the correct number of significant figures, and must show units! 1. (2 points) SHOW ALL WORK. A 7.10 g sample of nitric acid occupies 5.00 ml. Calculate the density of nitric acid. d = m/v = 7.10/5.00 = 1.42 g/ml 2. (2 points) A 5 g sample of calcium (an electrically conducting white metal that is shiny, relatively soft, melts at 850 C, and boils at 1440 C) was placed into 2.0 L of water at 25 C. The calcium reacted slowly with the water to give bubbles of gaseous hydrogen and a solution of the substance calcium hydroxide. In this description, what physical properties (name 3) and what chemical properties (name 1) are described? Examples of physical properties: conducting, white, shiny, soft, mp, bp, Chemical property: reacts with water to give hydrogen and calcium hydroxide 3. (4 points) SHOW ALL WORK. A 2.00 g sample of zinc oxide (contains only zinc and oxygen) contains 1.39 g of zinc. What mass of oxygen would be contained in a sample that weighs 4.35 g? = 0.61 g O (0.61 g O)/(2.00 g total) = (x g O)/(4.35 g total) (0.61)(4.35)/(2.00) = 1.3 g O Note that this method gives an answer with two sig fig, but other methods may give three sig fig answers, such as finding percentage and multiplying by that number. 4. (2 points) Fill in the blanks. 1 am = m 1 kg = 10 3 g 1 ML = 10 6 L 1 ng = 10-9 g

6 5. (4 points) SHOW ALL WORK. Convert F to K. K = C C = ( F 32)(5/9) Here, C = ( )(5/9) = (84.2)(5/9) = C K = = K (Last significant digit is underlined, for Celsius temp) 6. (5 points) SHOW ALL WORK. The recommended adult dose of ubiquomaxin is 4.50 mg/kg of body mass. Calculate the dose in mg for a 135-lb person. (135 lb person) x (454 g person)/(1 lb person) x (1 kg person)/(1000 g person) x (4.50 mg med)/(1 kg person) = 276 mg med

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