How does enthalpy of a reaction remain unaltered in the presence of a catalyst, explain.

How does a catalyst enhance the rate of a chemical reaction? At a constant temperature, does the enthalpy of chemical reaction remain same or change in presence of a catalyst?

How is the rate of a reaction affected by the presence of catalyst ?

For a reversible reaction in presence of a catalyst-

If the change in enthalpy of a reaction in absence of a catalyst is "xkJ.mol"^(-1) what will be the change in enthalpy of the reaction in the presence of a catalyst?

A hydrogenation reaction is carried out at 500K.If the same reaction is carried out in the presence of a catalyst at the same rate temperature required is 400K. Calculate the activation energy of the reaction if the catalyst lowers the activation barrier by 20"kJ.mol"^(-1)

A+BrarrC , on doubling the concentration of 'A , the rate of the reaction doubles. However on doubling the concentration of B , the rate of the reaction remains unaltered. Write the rate law of the reaction.

Water of river Ganges remains 'pure' due to presence of

How is activation energy affected by the use of a catalyst.

How does the rate of a reaction depends on surface area of the reactant?