AP Chemistry Review: Unit 9

A process which causes a decrease in entropy is

• condensation of steam to form liquid water

• vaporization of liquid water to form steam

• dissociation of solid sodium chloride into aqueous sodium cations and chloride anions

• sublimation of snow to water vapor

The substance with the smallest value of S^o is

• AlCl₃

• MgCl₂

• NaCl

• SnCl₄

Which of the following forms would have the greatest standard molar entropy?

• H₂(g)

• H₂(l)

• H₂O(g)

• H₂O(l)

Which has a negative sign for S?

• water evaporating

• NaCl dissolving in water

• water freezing

• sublimation of CO2

Tags

NGSS.HS-PS3-4

reaction is ALWAYS spontaneous

• - H, - S

• + H, + S

• + H, - S

• - H, + S

enthalpy is driving force when

• exothermic

• endothermic

• increase in entropy

• decrease in entropy

entropy is the driving force when

• exothermic

• endothermic

• entropy increasing

• entropy decreasing

If a reaction occurs, then delta G is

• negative

• positive

• can't tell

• 0

Tags

NGSS.HS-PS1-4

An endothermic reaction that experiences an increase in entropy is

• always spontaneous

• never spontaneous

• spontaneous at HIGH temps

• spontaneous at LOW temps

The _________is the electrode where oxidation occurs.

• anode

• cathode

• base

• electrolyte

Tags

NGSS.HS-PS2-5