Chemistry Quiz Equalibriums

Whats equilibrium?

The dynamic state in which the rate of the forward reaction equals the rate of the reverse reaction

What is the equation for Keq or Kc

[products]/[reactants]

What is NOT included in equilibrium equations?

Solids and liquids

What is Q?

Concentrations at any point in time

Where does Q= Keq shift?

Nowhere - equilibrium

Where does Q>Keq shift?

Products is too large, shift to reactants

Where does Q< Keq shift?

Reactants too large, shift to products

What does La Chateliers Principle?

a system at equilibrium will shift to minimize a disturbance (stress) to re-establish equalibrium

What can change the Keq value?

Only temperature changes

If the concentration of a reactant goes down what will happen?

shift to the reactant and the reverse reaction is favored

What happens if the concentration of a product goes down?

shift to the products, forward reaction is favored

What happens if the concentration of a product goes up?

Shift to the reactants, backwards reaction is favored

What happens if the concentration of a reactant goes up?

Shift to products, forward reaction favored

What happens if the pressure increases or the volume decreases?

Shift to the side with LESS moles of GAS

What happens if the pressure decreases or the volume increases?

Shift to side with MORE moles of GAS

What do you have to know for temperature changes?

Whether the reaction is endothermic or exothermic

What side does the temperature go on if it is endothermic?

Reactants side - left

What side does the temperature go on if its exothermic?

Products side- right

What do you treat the temperature as?

Another reactant - shift to whatever side you didn’t add the temperature (goes up) or towards temp (goes down)

What is Kp?

equilibrium with constant pressures

Whats the formula for Kp?

(Pproducts)/(Preactants)