HW1answers - Cheung, Anthony Homework 1 Due: Sep 8 2006,...

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Unformatted text preview: Cheung, Anthony Homework 1 Due: Sep 8 2006, 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. Problems 1-16 on this assignment are BASIC chemistry questions. Stuff you should already have learned in High School. For a refresher on this material look in the Fun- damentals sections of your book (the green edged pages at the front, Chapters A-M, or pages F1-F94). Problems 17-23 are from Chapter 1. This is where we officially START our course. 001 (part 1 of 1) 10 points Which of the following is a chemical property of sulfur? 1. melts at 119 C 2. burns in air correct 3. density of 2.07 g/ml 4. dissolves in carbon disulfide Explanation: Burning in air as opposed to melting or dis- solving shows a change it undergoes in chem- ical composition. Melting and dissolving are physical properties not chemical. 002 (part 1 of 1) 10 points Which of the following is an intensive prop- erty? 1. mass 2. volume 3. number of moles of molecules 4. weight 5. density correct Explanation: Intensive properties are independent of the amount of matter present. The density of a substance will be the same regardless of the size (large or small) of the sample. 003 (part 1 of 1) 10 points Which of the following describes a chemical change? 1. water is heated from 0 C to 50 C 2. wood is carved 3. alcohol evaporates 4. gasoline burns in an engine correct Explanation: A chemical change occurs when one or more substances are consumed (at least partially), and one or more new substances are formed. 004 (part 1 of 1) 10 points Which of the following is an extensive prop- erty? 1. mass correct 2. boiling point 3. temperature 4. heat of fusion Explanation: Extensive properties are those which de- pend on the amount of substance present. Mass depends and is directly proportional to the amount of matter present....
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This note was uploaded on 11/11/2010 for the course CH 301 taught by Professor Fakhreddine/lyon during the Fall '07 term at University of Texas at Austin.

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HW1answers - Cheung, Anthony Homework 1 Due: Sep 8 2006,...

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