Unit 3: Equilibrium and Kinetics

Which of the following characterizes a reaction at equilibrium?

• The forward rxn and backward rxn are equal.

• The forward rxn stops and backward rxn starts

• The forward rxn and backward rxn are stopped

• The reactants are changed into products.

Which of the following describes a rxn that reaches equililbrium?

• The products reach a maximum level and then begin to drop off.

• The products reach a final level and the reactants are gone.

• The products and reactants reach a final, unchanging level.

• The concentration of products and reactants begin to go up and down.

How can one tell if a rxn has reached equilibrium?

• The rxn stops once the reactants have been used up

• The concentrations of products and reactants are real.

• The rxn starts to go in the reverse direction.

• The concentrations of products and reactants stop changing.

What is an equilibrium constant?

• The value of the rate of the forward and reverse rxns at equilibrium

• The ratio of equilibrium concentrations of products to concentrations of reactants

• A constant relating the effects of activation energy and temperature on the rxn rate

• The amount of energy required for the collision of 2 molecules to result in a rxn

What information does an equilibrium constant give about a rxn?

• It tells what the rate constant of the rxn is at equilibrium

• It tells the energy of the rxn

• It tells the amount of time a rxn takes

• It tells whether products or reactants are favored at equilibrium

What is used to describe the conditions of a rxn at equilibrium?

• An equilibrium constant

• A rxn-rate constant

• An Ideal gas constant

• An activation energy

What does it mean if K_eq = 1?

• Reactants are favored over products in the rxn

• Products and reactants are equally favored in the rxn

• Al of the reactants have turned into products in the rxn

• Products are favored over reactants in the rxn

What does it mean if K_eq >> 1?

• Reactants are favored over prodcuts in the rxn

• Products are favored over reactants in the reaction.

• Products are favored over reactants in the rxn

• All the reactants have turned into products in the rxn

What does it mean if K_eq << 1?

• Products and reactants are equally favored in the reaction.

• Products are favored over reactants in the reaction.

• Reactants are favored over products in the reaction.

• All of the reactants have turned into products in the reaction.

What is K_eq for the reaction 2SO₂(g) + O₂(g) 2SO₃(g)?

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