Review for Term Exam

An increase in temperature causes the particles

• move faster.

• to slow down.

• collide less.

• to go to the right order.

A catalyst speeds up a reaction by

• giving them more energy.

• lowering the activation energy.

• increasing the amount of reactants.

• making the reactants more available.

Increasing the temperature of an endothermic reaction results in

• more reactants and products.

• fewer reactants and products.

• more products and fewer reactants.

• more reactants and fewer products.

Increasing the temperature of an exothermic reaction results in

• more reactants and products.

• fewer reactants and products.

• more products and fewer reactants.

• more reactants and fewer products.

Which of the following is true regarding the concentration of products, for a chemical reaction that is already at equilibrium, assuming no disruptions to the equilibrium?

• The concentrations of products will change continually because of reversibility.

• The concentrations of products will not change because the limiting reagent is gone.

• The concentrations of products will not change because there are no more reactants.

• The concentrations of products will not change because the forward and reverse rates are equal.

Which explanation best describes why a catalyst does not affect the position of equilibrium?

• A catalyst will increase the activation energy in both directions; therefore, no shift in the position of equilibrium will result.

• Equilibrium constants are not affected by adding a catalyst since no shift in the position of equilibrium occurs.

• The position is not affected by adding a catalyst since it speeds up both the forward and backward reactions by exactly the same amount.

• Not all chemical reactions respond to catalyst.

Which of the statements regarding the effect of reactant or product concentration changes on equilibrium is false?

• Removing a product shifts a reversible reaction in the direction of products.

• Adding a reactant always shifts a reversible reaction in the direction of reactants.

• Removing a reactant always shifts a reversible reaction in the direction of reactants.

• Adding a product causes a reversible reaction to shift in the direction of the formation of the reactants.

When the system A + B = C + D is at equilibrium,

• the forward reaction has stopped.

• the reverse reaction has stopped.

• both the forward and the reverse reactions have stopped.

• neither the forward nor the reverse reaction has stopped.

Which of the following substances gives a bitter taste?

• H₃PO₄

• HF

• HC₂H₃O₂

• Al(OH)₃

All of the following are CORRECT formulas of bases EXCEPT?

• KOH

• MgOH

• Al(OH)₃

• NaOH