Homework 01 - Su, Yung Homework 1 Due: Sep 10 2007, 11:00...

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Su, Yung – Homework 1 – Due: Sep 10 2007, 11:00 pm – Inst: FAKHREDDINE 1 This print-out should have 24 questions. Multiple-choice questions may continue on the next column or page – fnd all choices be±ore answering. The due time is Central time. Each question is worth 1 point. 001 (part 1 o± 1) 1 points Which statement is NOT true ±or a sample o± a compound? 1. Each o± the elements in the substance occurs in a constant proportion no matter what sample is tested. 2. The sample melts at a specifc tempera- ture. 3. The sample contains only one type o± substance and cannot be separated into other components without causing a chemical change. 4. The sample is homogeneous. 5. The sample can be separated using the physical properties o± ingredients that make up the sample. correct Explanation: Since the molecule is the smallest particle o± an element or compound that can have a stable independent existence, the compound cannot be physically separated into its in- gredients when the smallest part exists as a molecule with the same identity. 002 (part 1 o± 1) 1 points Which o± the ±ollowing is an element? 1. plastic 2. concrete 3. graphite correct 4. steel 5. glass Explanation: Graphite (C) is a pure chemical element. 003 (part 1 o± 1) 1 points A liquid does not have a constant boiling point, but it looks the same throughout. The liquid is probably a 1. heterogeneous mixture. 2. pure compound. 3. pure element. 4. homogeneous mixture. correct Explanation: I± the liquid does not have a constant boil- ing point, but it looks the same throughout, a homogeneous mixture is described. 004 (part 1 o± 1) 1 points The ±ormula O 3 represents 1. a molecule, an element, and a pure sub- stance. correct 2. an atom, an element, and a mixture. 3. an atom, an element, and a pure sub- stance. 4. a molecule, an element, and a mixture. 5. an atom, a compound, and a pure sub- stance. 6. an atom, a compound, and a mixture. 7. a molecule, a compound, and a pure sub- stance. 8. a molecule, a compound, and a mixture. Explanation: O 3 is composed only o± oxygen. It is the less common allotrope o± the element oxygen. (O 2 , o± course, is the more common ±orm.) Since more than one atom o± oxygen makes up O 3 , it exists as a molecule. By itsel±, it is a
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Su, Yung – Homework 1 – Due: Sep 10 2007, 11:00 pm – Inst: FAKHREDDINE 2 pure substance. 005 (part 1 of 1) 1 points Calculate the volume in of a ball that has a diameter of 9.3 inches. 1 inch = 2.54 cm (exactly) and π = 3.14159. The volume of a sphere is 4 3 πr 3 , for radius r . 1. 4 . 95 × 10 1 cm 3 2. 5 . 52 × 10 4 cm 3 3. 6 . 9 × 10 3 cm 3 correct 4. 3 . 37 × 10 3 cm 3 5. 1 . 21 × 10 5 cm 3 Explanation: D = 9 . 3 in × 2 . 54 cm 1 in = 23 . 622 cm = 2 r , so r = 11.811 cm V = 4 3 π r 3 = 4 3 × π × (11 . 811 cm) 3 = 6 . 9 × 10 3 cm 3 006 (part 1 of 1) 1 points A piece of metal has a volume of 0.250 hogsheads and a mass of 54.424 kg. Calculate the density of the metal in penny-
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This note was uploaded on 04/15/2009 for the course CH 54740 taught by Professor Fakhreddine during the Spring '09 term at University of Texas at Austin.

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Homework 01 - Su, Yung Homework 1 Due: Sep 10 2007, 11:00...

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