HEY PLZZZZ HELP MEEE , iam damn confused!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1?

Question

look , can u explain me the concpt of concentration in rate of chemical reactions and equilibrium

Answer 1

simply put: the higher the concentration the faster the reaction rate. in equilibrium the higher concentration shifts the reaction t o the other side.

Answer 2

For rate of reactions,

when you increase the concentration of a particular reactant in a mixture, you make available a greater number of moles and hence, molecules of the reactant. Statistically speaking, the more molecules of reactant available, the greater will be the number of collisions (think of physics here: in 1m^3, there will be more collisions occurrances between 20 molecules than if there were 10 molecules).

But reaction occurs only when the collisions are productive or 'fruitful' (due to steric factor [orientation] and activaiton energy considerations). the more collisions occuring per unit time, the more effective collisions there will be. the more effective collisions per unit time, the more products are formed per unit time, and hence the rate increases.

For equilibria,

when you increase the concentration of a reactant in a reversible reaction at dynamic equilibrium (when rate of formation of products=rate of formation of reactants), the position of the equilibirum will shift in the direction where the concentration of that reactant decreases (! you manually caused the initial increase, but this decrease occurs by chemical reaction - it's the reaction which is responding to your constraint). Physics again, it's like Newton's 3rd law - action; equal and opposite reaction.

it's like you have disturbed the conditions at dynamic equilibrium by increasing conc, so the rxn sets it right back again by decreasing the conc.

the reaction will then proceed in the direction where the reactant whose conc you inc, gets USED UP.

in chemistry they call it Le Chatelier's Principle.

Answer 3

when concentration increases the number of reacting molecules increases thus increasing the number of successful collisions and vice versa this explains the relationship between the concentration and the rate of reactions but in case of equilibrium when concentration is increased the position of dynamic equilibrium will be shifted to the direction which will decrease it and vice versa.

Answer 4

u must have searched net for this but i tell u very short and precise answer.
the more concentrated the substance used(reactant),the faster the speed of reaction.this is because at higher concentration there is greater likelihood that reacting molecule will collide with oneanother with sufficient energy to form product.e.g it is for this reason of concentration that pure oxygen instead of air is used in oxygen tents in hospital to speed up recovery of patients.also pure oxygen is used in oxyacetylene .here when acetylene burn it produces heat w is used to melt so that it can be cut.if we use pure oxygen instaed of air the no of collision between acetylene molecules and oxygen is increased.it therefore burns w greater speed producing more heat and temp for welding.i think i have got to longer.u can contact w me at [e-mail]
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rahul
have a nice day

Answer 5

Actually concentration is ratio of no. of moles of solute to volume of solution.