Chem Test TOMMOROW

What is Dynamic Equilibrium

A state where the forward and reverse reaction rates are equal, resulting in constant concentrations of reactants and products.

Write the Keq for the expression 2NO2​(g)↔N2​O4​(g)

Keq​=[NO2​]²/[N2​O4​]​

How do use Q to predict the direction of a reaction?

Q < K: Shift right (towards products)

Q > K shift left towards reactants

Q = K at equilibrium

: Write the Kspp​ expression for Mg(OH)2Mg(OH)_2Mg(OH)2​.

Ksp​=[Mg2+][OH−]2
For molar solubility sss:
Ksp=4s3K_{sp} = 4s^3Ksp​=4s3

What happens if pressure is increased in the reaction below?
2SO2(g)+O2(g)↔2SO3(g)2SO_2(g) + O_2(g) \leftrightarrow 2SO_3(g)2SO2​(g)+O2​(g)↔2SO3​(g)

The equilibrium shifts right (toward fewer gas moles) to reduce pressure.

How does add NA CL affect the solubility of AgCl

Adding NaCl increases Cl, shifting equilibrium left and decreasing AgCl solubility.

How do you determine if a precipitate forms?

By comparing the ion product to the Ksp value of the compound.

If Q > K precipitate

If K > Q no precipitate

What are the steps in dissolving an ionic compound in water?

1. Overcoming lattice energy.

2. Separating water molecules.

3. Hydration of ions

What is the equation for Gibbs free energy, and what does it indicate about spontaneity?

<G = <H -T<S

ΔG<0: Reaction is spontaneous.

ΔG>0: Reaction is non-spontaneous.