Unit 9: Thermodynamics and Electrochemistry

Front

What is a thermodynamically favorable reaction?

Back

A reaction with a negative ΔG (−ΔG).

Front

What conditions make a reaction always thermodynamically favorable?

Back

Reactions with negative ΔH (−ΔH) and positive ΔS (+ΔS) are always thermodynamically favorable, being both enthalpy driven and entropy driven.

Front

What happens to ΔS when the number of moles of gas increases?

Back

ΔS is positive (+ΔS) when the number of moles of gas increases.

Front

What does it mean if ΔG is negative?

Back

If ΔG is negative, then the equilibrium constant Keq is greater than 1 (Keq > 1).

Front

What should you ensure when using the equation ΔGo = ΔHo − TΔSo?

Back

Ensure that ΔH and ΔS are in the same units when using the equation.

Front

What is ΔG at equilibrium?

Back

ΔG is zero (ΔG = 0) at equilibrium.

Front

What is the value of R in the equation ΔGo = −RT lnK?

Back

The value of R is 8.314 J/mol K, so ΔG will be in Joules.

Front

What is kinetic control in reactions?

Back

A reaction with a negative ΔG that does not proceed at a measurable rate is under kinetic control, often due to high activation energy.

Front

What are the oxidation numbers for H and O?

Back

H is +1 (except in hydrides where it is -1), and O is -2 (except in peroxides where it is -1).

Front

What does LEO goes GER mean?

Back

LEO goes GER stands for 'Lose Electrons Oxidation, Gain Electrons Reduction'. Oxidation occurs at the anode.