What statement about the catalyst is correct? O it increases a value of the equilibrium constant It increases the number of collisions between reacting molecules. It makes the reaction more endothermic. It provides an alternative reaction mechanism with a lower activation energy. O It shifts an equilibrium to the right

At equilibrium, the forward rate is faster than the reverse rate. True O False

A catalyst increases the activation energy required for a reaction to proceed. True False

when an equilibrium is disrupted (“stressed”) due to changes that a chemist imposes on the system, Le Chatelier’s Principle predicts that the equilibrium will shift in the direction that will undo as much of the change as possible. For instance, if a particular reactant compound is removed through some chemical means, then the equilibrium will shift to favor the reactants, so as to replace some of the lost compound. In this lab, you will observe the effects of stress on the tetrachlorocobaltate(II)/hexaquocobalt(II) equilibrium shown below: CoCl42-(solv) + 6 H2O(solv) Co(OH2)62+(solv) + 4 Cl-(solv) blue pink The (solv) means a solvated species. In this system, ethanol is the solvent. This means that water can not be excluded from the reaction quotient any longer, since it is now a solute in ethanol and therefore has a measurable concentration. The color of the solution provides a visual clue about the dominant cobalt species…

The catalyst influences the rate of reaction in which ways? nothing happens O Decreases it O Increases it O Stops the reaction

Which of the following is not true of catalysts? O They become part of the final product. O They are unchanged by the reaction they catalyze. O They speed up reactions. O They do not change the normal position of a chemical equilibrium.

How does a catalyst influence the rate of a reaction?

Which is the appropriate description to show the effect of a catalyst on the reaction rate and equilibrium in a reversible reaction: Reactants › Products O• The rate of the forward reaction is increased. • The rate of the reverse reaction is decreased 0 •The equilibrium position is displaced to the right O • The rate of the forward reaction is increased. The rate of the reverse reaction is increased The equilibrium position is unchanged. • The rate of the forward reaction is increased. 0 •The rate of the reverse reaction is unchanged • The equilibrium position is displaced to the right • The rate of the forward reaction is unchanged. The rate of the reverse reaction is unchanged The equilibrium position is unchanged. Suppose that an exothermic reaction, Reactants < › Products, is at equilibrium. According to Le Chatelier's Principle, if the reaction temperature is increased, in which direction will the equilibrium be displaced? O The equilibrium will be displaced toward the…

Increasing the concentration of the reactants will slow down the reaction. O true O false

A catalyst increases the activation energy of a reaction and thus facilitates the reaction True False