AP Chemistry Unit 9 Essential Knowledge

The Free energy value must be ___ for a reaction to be FAVORABLE thermodynamically

NEGATIVE

The voltage needs to be ____ for a reaction to be THERMODYNAMICALLY FAVORABLE

POSITIVE

If H is negative, but S is positive, what will G be? Is it thermodynamically favorable?

ALWAYS

Entropy increasing is based on

the dispersion of matter

• the more dispersed matter is within a space = the greater entropy it will have

  • Greater volume allows for particles to disperse more

  • Matter change to gas = greater entropy

If H is positive and S is -, what will G be?

G will be positive, meaning it is NEVER thermodynamically favorable

If H is negative and S is negative what will G be? IS it thermodynamically favorable?

Either negative or positive (depends on numerical values). It is only thermodynamically favorable at LOW TEMPS

If both H and S are positive, what will G be? Is it thermodynamically favorable?

Either positive or negative,

oxidation occurs at the

ANODE

reduction occurs at the

CATHODE (tenna!)

electrons will flow AWAY from the

ANODE

electrons will flow to the

CATHODE

The salt bridge exists to

balance charges

Cations will flow to the

CATHODE

Anions flow to the

ANODE

Voltage will drop to ____ if salt bridge is removed

0

When a reaction reaches equlibrium, G will equal…

0