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ChemHMWK1 - Weinelt Karl Homework 1 Due Sep 7 2003 midnight...

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Weinelt, Karl – Homework 1 – Due: Sep 7 2003, midnight – Inst: Donna Lyon 1 This print-out should have 25 questions, check that it is complete. Multiple-choice questions may continue on the next column or page: find all choices before making your selection. The due time is Central time. This homework assignment is due Sunday, September 9th by midnight. 001 (part 1 of 1) 10 points Which of these describes a chemical property? 1. Oxygen is a gas. 2. Ice melts at 0 C. 3. Sodium is a soft, shiny metal. 4. Helium is very nonreactive. 002 (part 1 of 1) 10 points Which of the following is a physical property? 1. Melting of ice 2. Rusting of iron 3. Burning of natural gas 003 (part 1 of 1) 10 points A pure substance composed of two or more elements chemically combined is a(n) 1. solution. 2. mixture. 3. compound. 4. atom. 004 (part 1 of 1) 10 points Which of the following is classified as a mix- ture? 1. pure silver 2. distilled water 3. aluminum 4. tap water 005 (part 1 of 1) 10 points Which of these name/symbol combinations is incorrect? 1. phosphorus/P 2. arsenic/Ar 3. copper/Cu 4. potassium/K 5. barium/Ba 006 (part 1 of 1) 10 points Analyses of three samples yielded the follow- ing results: Sample Mass of Mass of Mass of # sample carbon hydrogen 1 1.000 g 0.937 g 0.0629 g 2 0.244 g 0.229 g 0.0153 g 3 0.100 g 0.076 g 0.0242 g Which are pure compounds?
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