Korter_Exam_1_2007

Korter_Exam_1_2007 - 1. All of the following statements are...

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1. All of the following statements are correct EXCEPT [A] The evaporation of water is a physical change. [B] The conversion of sugar to carbon and water is a chemical change. [C] The conversion of liquid water to gaseous water is a chemical change. [D] The conversion of elements into compounds is a chemical change. [E] The conversion of compounds into elements is a chemical change. 2. What is the symbol of the ion having 13 protons and 10 electrons? [A] Cl - [B] Al 3+ [C] S 2- [D] P 3- [E] Mg 2+ 3. The analysis of an organic compound showed that it contained 0.175 mol of C, 0.140 mol of H, and 0.0350 mol of N. Its molecular mass is about 160. How many atoms of carbon are there in the empirical formula for the compound and how many in the molecular formula? [A] empirical = 5, molecular = 12 [B] empirical = 3, molecular = 6 [C] empirical = 5, molecular = 10 [D] empirical = 3, molecular = 9 [E] empirical = 2, molecular = 3 4. From a balanced equation we should be able to extract the following information: 1. the number of molecules of reactants and products. 2. the relative mass of each reactant and product. 3. the number of atoms of each element before and after reaction. [A] 1 only [B] 2 only [C] 3 only [D] 1 and 2 only [E] 1, 2, and 3
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5. The term that best relates to the precision of a set of laboratory measurements is [A] the number of significant figures. [B] converting unit.
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This note was uploaded on 02/09/2010 for the course CHE CHE 106 taught by Professor Korter during the Fall '09 term at Syracuse.

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Korter_Exam_1_2007 - 1. All of the following statements are...

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