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HW1Solutions

# HW1Solutions - Owlia Arria Homework 1 Due Sep 6 2007...

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Owlia, Arria – Homework 1 – Due: Sep 6 2007, midnight – Inst: Vandenbout 1 This print-out should have 23 questions. Multiple-choice questions may continue on the next column or page – fnd 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 fnd most oF this inFormation in the frst 4 chapters oF your textbook. 001 (part 1 oF 1) 10 points What is the symbol For the element silver? 1. Su 2. Si 3. Ag correct 4. Au 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. a mixture. 2. a compound. correct 3. a solution. 4. an atom. Explanation: A compound is a substance composed oF two or more elements chemically combined. 003 (part 1 oF 1) 10 points A FactoroF1 . 0 × 10 - 6 corresponds totheprefx 1. milli. 2. micro. correct 3. nano. 4. mega. Explanation: Micro reFers to 1 . 0 × 10 - 6 . 004 (part 1 oF 1) 10 points What is 0.00875 in scientifc notation? 1. 8 . 75 × 10 - 3 correct 2. 8 . 75 × 10 3 3. 0 . 0875 × 10 1 4. 8 . 8 × 10 - 3 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 signifcant fgures. (23 . 1 + 5 . 61 + 1 . 008) × 7 . 6134 × 8 . 431 = 1. 1907.5661 2. 1907.56 3. 1907.6 4. 1900 5. 1908 6. 1910 correct 7. 2000 8. 1907.566 9. 1907 Explanation: ±or the addition, the position oF the great- est magnitude is the tenths 23.1 so the solu- tion to this part will have 3 signifcant fgures. 29 . 7 × 7 . 6134 × 8 . 431 = 1907 . 6

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Owlia, Arria – Homework 1 – Due: Sep 6 2007, midnight – Inst: Vandenbout 2 The smallest number of sigFgs is 3, so the answer is rounded to 1910. 006 (part 1 of 1) 10 points ±ind 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. 2.5 cm 3 correct 2. 63 cm 3 3. 772.00 cm 3 4. 31 cm 3 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 2 ) 3 2. Al 3 (CO 3 ) 2 3. Al 2 (CO 3 ) 3 correct 4. AlCO 3 5. Al 2 (CO 3 ) 5 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.
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HW1Solutions - Owlia Arria Homework 1 Due Sep 6 2007...

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