homework 5KEY spr08

homework 5KEY spr08 - CHEM 1016 Homework #5 Posted: Monday,...

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Homework #5 Posted: Monday, February 4, 2008 Due: Tuesday, February 12, 2008 Choose the correct response to each of the following multiple choice questions and fill in the corresponding space on your orange opscan. 1. The rates of chemical reactions can be manipulated by 1. changing the concentrations of the reactants. 2. changing the temperature of the reactants. 3. introducing catalysts (or, in a biological context, enzymes.) 4. all of the above***** 5. none of the above. The rates of chemical reactions are determined solely by the valence configurations of the atoms that make up the molecules of reactants. 2. The decomposition of hydrogen peroxide was accomplished rapidly in class because your instructor 1. added soap to the mixture in the cylinder which catalyzed the reaction. 2. added KI to the mixture in the cylinder which catalyzed the reaction. 3. heated the mixture of KI, H 2 O 2 , and soap with a hot plate. 4. used concentrated (30%) reagent grade H 2 O 2 instead of the 3% solution you buy in brown bottles in the grocery store. 5. 1 and 4 6. 2 and 4***** 7. 3 and 4 3. According to kinetic molecular theory, reactions occur more rapidly at higher temperatures because 1. molecules move faster at higher temperatures. 2. molecules collide more frequently at higher temperatures. 3. molecules have more energy at higher temperatures. 4. all of the above***** 5. None of the above are true; as we stated in question #2, the rates of chemical reactions are determined solely by the valence configurations of the atoms that make up the molecules of reactants. 4. Though we know that quantum mechanics attributes translational, rotational, and vibrational motion to atoms within even the coldest solids (those nearest 0 K) and that, as a consequence, scientists will never measure a temperature of 0 K, scientists will continue to TRY to do so. 1.
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homework 5KEY spr08 - CHEM 1016 Homework #5 Posted: Monday,...

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