Unit 5- Module 2-ProbsKey

Unit 5- Module 2-ProbsKey - Module 2 Unit 5 Contemplation...

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Module 2 Unit 5 Contemplation Problems Key Predictions of Processes 1) Predict the signs of Δ H °, ΔS °, and Δ G ° for the following a) Freezing of liquid water at -10°C (freezing point of water is 0°C) Δ H ° + or ΔS° + or Δ G ° + or b) The combustion of liquid octane to produce gaseous water and carbon dioxide. Δ H ° + or ΔS° + or Δ G ° + or c) A hair dryer is used to heat a rubber band, which contracts. Δ H ° + or ΔS° + or Δ G ° + or d) An exothermic reaction that has a very small K. Δ H ° + or ΔS° + or Δ G ° + or 2) When solid potassium iodide is put into water, it completely dissolves and the solution becomes cool. For this change, which is of a larger magnitude, ∆S° or ∆H°? Provide a brief explanation. If the process is favored (it dissolves) and becomes cool, then the only way for Δ G ° for the process to be negative is for there to be a large positive ∆S°. This results from the solid going to aqueous. 3) Chemists often use the phrase “thermodynamically unstable, but kinetically stable” to describe a compound. What does this phrase mean? Thermodynamically unstable but kinetically stable means that a substance is in the process of transforming into a more stable product (as measured by potential energy) but the rate of that transformation is so slow that it appears as if the substance is stable. Graphite is a more thermodynamically stable form of carbon as
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Unit 5- Module 2-ProbsKey - Module 2 Unit 5 Contemplation...

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