# HW-1 - Rahman Tarique Homework 1 Due Sep 6 2007 midnight...

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Rahman, Tarique – 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. an atom. 2. a mixture. 3. a solution. 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 tothe prefx 1. mega. 2. nano. 3. milli. 4. micro. correct 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 2. 8 . 75 × 10 - 3 correct 3. 8 . 8 × 10 - 3 4. 0 . 0875 × 10 1 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. 1907.56 2. 1907.5661 3. 1910 correct 4. 1907 5. 1900 6. 2000 7. 1908 8. 1907.6 9. 1907.566 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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Rahman, Tarique – 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. 63 cm 3 2. 31 cm 3 3. 2.5 cm 3 correct 4. 772.00 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 strontium phosphate? 1. Sr 3 (PO 3 ) 2 2. SrPO 4 3. Sr 2 (PO 4 ) 3 4. Sr 3 (PO 4 ) 2 correct 5. Sr(PO 4 ) 3 Explanation: Strontium forms Sr 2+ ions and the phos- phate ion is PO 3 - 4 , so the formula is Sr 3 (PO 4 ) 2 . 008 (part 1 of 1) 10 points How many protons and electrons are present in the Mg 2+ ion? 1.
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## This note was uploaded on 10/31/2009 for the course CH 56435 taught by Professor Flowers during the Spring '08 term at University of Texas.

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HW-1 - Rahman Tarique Homework 1 Due Sep 6 2007 midnight...

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