HW1answers pg2 - K, Ag, Po, Cl, S 4. Ph, Po, Ag, Al, S 5....

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5. Iron rusts Explanation: A physical change occurs with no change in chemical composition. Melting involves no change in composition, only a phase change. 006 (part 1 of 1) 10 points Which of the following is an extensive prop- erty? 1. 3 miles correct 2. 12 F 3. 3.58 dollars/pound 4. 140 calories per tablespoon Explanation: 3 miles is analogous to an amount of some- thing. Extensive properties are those which depend on the amount of substance present. If a smaller sample of mileage was taken, it would be less than 3 miles and thus dependent on the amount. 007 (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 compound. correct 4. a solution. Explanation: A compound is a substance composed of two or more elements chemically combined. 008 (part 1 of 1) 10 points Identify the symbols for the elements phos- phorus, potassium, silver, chlorine, and sul- fur, in that order. 1. Ph, K, Ag, S, Cl 2. P, K, Ag, Cl, S correct 3.
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Unformatted text preview: K, Ag, Po, Cl, S 4. Ph, Po, Ag, Al, S 5. P, Po, Ag, Cl, S Explanation: The symbol for phosphorus is P, for potas-sium K, for silver Ag, for chlorine Cl, and for sulfur S. 009 (part 1 of 1) 10 points A pure substance made up of the same kind of atoms is called 1. a chemical bond. 2. a compound. 3. a pure mixture. 4. None of these 5. an element. correct Explanation: An element is a substance that cannot be decomposed into simpler substances by chem-ical means. It is made of the same kind of atoms. 010 (part 1 of 1) 10 points Give the names for the symbols Fe, Hg, N, Au, and Ne (in that order). 1. ±uorine, mercury, nickel, silver, neon 2. iron, mercury, nitrogen, silver, neon 3. ±uorine, hydrogen, nitrogen, gold, neon 4. iron, hydrogen, nickel, gold, nitrogen 5. iron, mercury, nitrogen, gold, neon cor-rect Explanation: Fe is iron, Hg is mercury, N is nitrogen, Au is gold, and Ne is neon....
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This note was uploaded on 01/23/2011 for the course CH 301 taught by Professor Fakhreddine/lyon during the Spring '07 term at University of Texas at Austin.

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