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Unformatted text preview: Version 161 HW01 Walker (53970) 1 This print-out should have 22 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 1.0 points The major component of our atmosphere is 1. carbon dioxide. 2. nitrogen. correct 3. hydrogen. 4. oxygen. Explanation: 002 1.0 points Which is NOT a mixture? 1. sodium chloride correct 2. a jar filled with rocks and sand 3. a glass of Kool-Aid 4. sea water Explanation: Sodium chloride is a compound; Na and Cl are chemically bound together and cannot be separated via physical means. 003 1.0 points Which diagram(s) best characterize(s) a mix- ture? I II III IV 1. III and IV only correct 2. IV only 3. I and III only 4. I, II and III only Explanation: A mixture consists of different substances combined together physically. The dark and light spheres represent atoms of different ele- ments. Although some atoms are chemically bonded in the figures, the samples do not con- sist of all of the same type of bonded atoms. 004 1.0 points Which of the following is classified as a mix- ture? 1. distilled water 2. aluminum 3. pure silver 4. tap water correct Explanation: A mixture is a sample of matter composed of variable amounts of two or more sub- stances, each of which retains its own identity and properties. Tap water is a mixture made of water, minerals, and impurities. Version 161 HW01 Walker (53970) 2 005 1.0 points Which of these name/symbol combinations is incorrect? 1. nickel : Ni 2. silicon : Si 3. boron : B 4. potassium : P correct 5. arsenic : As Explanation: The symbol for potassium is K. 006 1.0 points Give the names for the symbols Fe, Hg, N, Au, and Ne (in that order)....
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