5A: Acid-Base & Solubility · Flashcards

Question

oxidized vs oxidizing agent

Tap to flip

Answer

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

Tap to flip back

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 $\to C$ ?

Tap to flip

Answer

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

Tap to flip back

Question

Second Law of Thermodynamics

Tap to flip

Answer

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

Tap to flip back

Question

entropy of the system vs entropy of the universe

Tap to flip

Answer

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

Tap to flip back