5A: Acid-Base & Solubility — Flashcards

Question

oxidized vs oxidizing agent

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Answer

The oxidized species loses electrons; the oxidizing agent gains them and is reduced.

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Question

A $\to B$ , $Δ H = + 40 k J / m o l$ ; B $\to C$ , $Δ H = - 70 k J / m o l$ . What is $Δ H$ for A $\to C$ ?

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Answer

$Δ H = - 30 k J / m o l$ , exothermic; add the step enthalpies by Hess's Law.

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Question

Second Law of Thermodynamics

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Answer

For spontaneous processes, the entropy of the universe tends to increase.

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Question

entropy of the system vs entropy of the universe

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Answer

A system's entropy can decrease if the surroundings increase enough to make $Δ S_{u ni v er se} > 0$ .

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