How does concentration affect the rate of reaction?

Describe how reactant concentration,reaction,temperature,catalyst and the surface area of liquid or solid reactant affect the rate of a chemical reaction.

• Answer:

  Answer is two fold (01)Let us take an elementary reaction A+B ->C,moles of reactant A will collide with moles of reactant B ,more the collision ,faster will be the reaction.(number of collision, mol/litr-sec) If we increase the temperature then there will be more collision ,which will increase the rate of reaction If the surface area is more then there will be intimate contact between the two reactants & this will increase the rate of reaction. (02)Rate of reaction depends upon equilibrium-Your question can easily be explained with the help of Le-chatlier`s principle.which states that if a system is in equilibrium ,a change in any of the factors that determine the condition of equilibrium will cause the eqm to shift in such a way as to minimise the effect of this change. If the reaction releases temperature(exothermic)make arrangements to remove the heat to keep the reaction going & vice versa if it reaction is endothermic. The addition of reactants to a system in eqm causes the eqm to shift in the direction that decreases the concentration of added component. catalyst are the substances that increses or decreases the speed of reaction, do not participate in the reaction , only forms intermediate product & comes to its original form,no mass or chemical changes in catalyst take place.