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Chemistry HW 1 - Kim Eugene Homework 1 Due Sep 6 2007...

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Kim, Eugene – Homework 1 – Due: Sep 6 2007, midnight – Inst: McCord 1 This print-out should have 23 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. This homework has problems that should review what you have already learned in high school or at least previous to our course. You will find most of this information in the first 4 chapters of your textbook. 001 (part 1 of 1) 10 points What is the symbol for the element silver? 1. Su 2. Ag correct 3. Au 4. Si Explanation: The symbol for silver is Ag. 002 (part 1 of 1) 10 points A pure substance composed of two or more elements chemically combined is 1. an atom. 2. a solution. 3. a mixture. 4. a compound. correct Explanation: A compound is a substance composed of two or more elements chemically combined. 003 (part 1 of 1) 10 points A factor of 1 . 0 × 10 - 6 corresponds to the prefix 1. micro. correct 2. mega. 3. nano. 4. milli. Explanation: Micro refers to 1 . 0 × 10 - 6 . 004 (part 1 of 1) 10 points What is 0.00875 in scientific notation? 1. 0 . 0875 × 10 1 2. 8 . 8 × 10 - 3 3. 8 . 75 × 10 3 4. 8 . 75 × 10 - 3 correct Explanation: 0.00875 = 8 . 75 × 10 - 3 (move decimal 3 places to right) 005 (part 1 of 1) 10 points What is the proper solution to the following equation? Answer with correct significant figures. (23 . 1 + 5 . 61 + 1 . 008) × 7 . 6134 × 8 . 431 = 1. 1907.56 2. 1907.566 3. 1908 4. 1907.5661 5. 1907 6. 1907.6 7. 2000 8. 1910 correct 9. 1900 Explanation: For the addition, the position of the great- est magnitude is the tenths 23.1 so the solu- tion to this part will have 3 significant figures. 29 . 7 × 7 . 6134 × 8 . 431 = 1907 . 6
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Kim, Eugene – Homework 1 – Due: Sep 6 2007, midnight – Inst: McCord 2 The smallest number of sigfigs is 3, so the answer is rounded to 1910. 006 (part 1 of 1) 10 points Find the volume of the Hope Diamond given the density of diamond (carbon) is 3.51 g/cm 3 and the weight is 44 karats. (1 karat = 0.200 g) 1. 31 cm 3 2. 772.00 cm 3 3. 63 cm 3 4. 2.5 cm 3 correct Explanation: density = 3.51 g/cm 3 m = 44 karat m diamond = 44 karat × 0 . 200 g 1 karat = 8 . 8 g V = m density = 8 . 8 g 3 . 51 g / cm 3 = 2 . 5 cm 3 007 (part 1 of 1) 10 points What is the formula of aluminum carbonate? 1. Al 2 (CO 3 ) 5 2. Al 2 (CO 3 ) 3 correct 3. Al 3 (CO 3 ) 2 4. AlCO 3 5. Al 2 (CO 2 ) 3 Explanation: Aluminum forms Al 3+ ions and the car- bonate ion is CO 2 - 3 , giving a formula of Al 2 (CO 3 ) 3 . 008 (part 1 of 1) 10 points How many protons and electrons are present in the Mg 2+ ion? 1. 10 protons, 14 electrons 2. 14 protons, 14 electrons 3. 10 protons, 10 electrons 4. 14 protons, 10 electrons 5. 14 protons, 12 electrons 6. 12 protons, 10 electrons correct 7. 12 protons, 14 electrons 8. 12 protons, 12 electrons 9. 10 protons, 12 electrons Explanation: Mg has atomic number 12; it has 12 protons and 12 electrons; Mg 2+ has only 10 electrons.
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