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Unformatted text preview: indicated. Represent substances in solutions as ions if the substances are extensively ionized. Omit formulas for any ions or molecules that are unchanged by the reaction. You may use the empty space at the bottom of the next page for scratch work, but only equations that are written in the answer boxes provided will be graded. (a) Chlorine gas, an oxidizing agent, is bubbled into a solution of potassium bromide at 25°C. (i) Balanced equation: Cl2 + 2 Br− → 2 Cl− + Br2 One point is earned for the correct reactants. Two points are earned for the correct products. One point is earned for balancing the equation for mass and charge. (ii) Predict the sign of ΔS° for the reaction at 25°C. Justify your prediction. The sign of ΔS° is negative. One of the reactants, Cl2, is a gas at 25°C, but there are no gaseous products. Gases have high entropies, so the entropy of the reactants is greater than the entropy of the products, making ΔS° negative. One point is earned for a correct answer...
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This note was uploaded on 05/05/2011 for the course CHEM 504 taught by Professor John during the Fall '11 term at American College of Computer & Information Sciences.

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