Which of the following will decrease the rate of a reaction? A B C Give detailed Solution with explanation needed Removing a catalyst from the reaction. Decreasing the temperature. Decreasing the surface area of a solid reactant. D Decreasing the concentration of the reactants. E All of these will decrease the rate of a reaction.

a What happens to a reaction rate as temperature drops? Give two explanations for the change. State which one is more important and explain why. b How does a catalyst affect reaction rates? c Compare reaction rates when a given reactant concentration is high with the rate when the concentration is low. Explain the difference.

When molecules collide, a certain minimum energy called the _________ is needed for the reaction to occur.

. Addition of an inert substance (one that does not participate in the reaction) does not change the _________ of an equilibrium.

12.100 A reaction important in smog formation is O3(g)+NO(g)O2(g)+NO2(g)K=6.01034 (a) If the initial concentrations are [O3]=1.0106M,[NO]=1.0105M,[NO2]=2.5104M, and [O2]=8.2103M , is the system at equilibrium? If not, in which direction does the reaction proceed? (b) If the temperature is increased, as on a very warm day, will the concentrations of the products increase or decrease? (HINT: You may have to calculate the enthalpy change for the reaction to find out if it is exothermic or endothermic.)

. Equilibrium may be defined as the ________ of two processes, one of which is the opposite of the other.