test 3 chem

Increase In Volume

decrease in pressure

Which of the following correctly reflect ways in whicj a chemical equilibrium can be disturbed? Select all that apply.

Changing the concentrations of reactants or products Changing the temperature of the system Changing the volume of the reaction container for a reaction involving gases

If a system is disturbed by a change in concentration, the system will shift to ___ a substance that is added and to ___ a substance that has been removed

Consume; produce

Which of the following statements correctly describe how the addition of a catalyst will affect a system at equilibrium? Select all that apply.

Equilibrium is unaffected A catalyst does not change the value of K.

Which of the following statements correctly describe how an equilibrium system containing gases will respond to changes in volume and/or pressure, if the temperature remains unchanged? Select all that apply.

If the total number of moles of gas in the products and reactants is the same, a change in volume will not affect the equilibrium position If an inert gas is added there will be no effect on the equilibrium position If the volume is decreased the reaction shifts in the direction that produces fewer moles of gas

If a system at equilibrium is disturbed by changing the concentration of a reactant or product, the equilibrium ______ will shift but the ratio of product to reactant will be ____ once the system reestablishes equilibrium. The value of K will be ___

Position The same Unchanged

If an equilibrium system contains gaseous reactants and/or products, a change in volume will cause a change in concentration and pressure. A decrease in volume will cause the system to shift in the direction that produces _____ moles of gas in total, whereas an increase in volume causes a shift in the direction that produces ______ moles of gas in total

fewer; more

Which of the following statements correctly describe how a system at equilibrium will respond to a change in concentration of any species that appears in the expressions for Q and K. Select all that apply.

if a reacting substance is added the equilibrium position will shift to use up the substance if a reactant is removed from the system the equilibrium will shift toward the reactants the value of Kc is not affected by changes in concentration

adding a gaseous reactant

increase in pressure

adding an inert gas

increase in total pressure, but no change in partial pressures of gases

adding a solid

no effect on pressure

A system at equilibrium will respond to a disturbance by a shift in equilibrium position. A "shift to the left" indicates that the reaction proceeds toward the _____, whereas a "shift to the right" indicates that the reaction proceeds toward the ____.

reactants; products

Le Chatelier's Principle states that when a chemical system at equilibrium is disturbed, the system will undergo a net reaction that ____ the effect of the disturbance and will attain a new ___ position.

reduces; equilibrium