Which of the following are true statements ? a) For a reactionwhere K c >> 1, th

Question

Which of the following are true statements ? a) For a reactionwhere Kc >> 1, the initial concentrationof reactant is 0.125 M.
When equilibrium has been achieved, this concentration will havechanged
by only a negligible amount b) For a chemical reaction whereKc ˜ 1, , there will be significantconcentrations
of both reactant and product species when equilibrium has beenachieved c) For a reaction with a where Kc<< 1, the initial concentration of reactant is 0.00671 M.
When equilibrium has been achieved, this concentration will havebeen reduced by only a very
small amount d) A catalyst can reduce the time a given reactiontakes to reach equilibrium, but in doing so will cause
different equilibrium concentrations than those achieved withoutthe use of the catalyst

Explanation / Answer

a) For a reaction where Kc >> 1, theinitial concentration of reactant is 0.125 M.
When equilibrium has been achieved, this concentration will havechanged
by only a negligible amount When Kc >> 1, the concentration of products is very highcompared to reactants. So the concentration changes by a greatamount. So this statement is false. b) For a chemical reaction where Kc ˜1, , there will be significant concentrations
of both reactant and product species when equilibrium has beenachieved when Kc ~= 1, it means that concentration of both reactant andproducts are nearly equal. So  there will be significantconcentrations of both reactant and product species whenequilibrium has been achieved. This is true. c) For a reaction with a where Kc <<1, the initial concentration of reactant is 0.00671 M.
When equilibrium has been achieved, this concentration will havebeen reduced by only a very
small amount. When Kc<< 1, the reaction is reactant favoured. So theinitial concentration of reactant reduces by only a very smallamount. This is true. d) A catalyst can reduce the time a given reaction takes toreach equilibrium, but in doing so will cause
different equilibrium concentrations than those achieved withoutthe use of the catalyst. This is false. With or without acatalyst, the equilibrium concentrations will be the same.

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