True or false? (explain) a) Every reaction has an order. (b) Partial orders are
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True or false? (explain) a) Every reaction has an order. (b) Partial orders are always integers. (c) The rate law for the elementary reaction A + 2B rightarrow products in an ideal system must be r = k [A]^2[B]. (d) For the reaction scheme A rightarrow B rightarrow C where the concentrations of any intermediate are negligible and the volume is constant the following statements are correct [A] = - [B], Delta A = -Delta B, Delta A + Delta B + Delta C = 0 (e) The rate law for the composite reaction C + D rightarrow products in an ideal system must be r = k[C][D]. (f) Knowledge of a detailed mechanism of a reaction leads to a unique set of rate laws. (g) Knowledge of the overall reaction, including the values of the rate coefficients, leads to a unique mechanism.Explanation / Answer
order is the power to which the concentration term in the rate expression is raised.
the rate-rA= -dCA/dt= K[A] n, [A] concentration of reactant A. A reaction can have zero order also. In that case, the rate of reaction depends on some thing else other than concentration.
2. Order is determined experimentally and hence it can be fraction as well. So the partial orders need not be integers.
3. for elementary reaction, the rate is defined as -rA= K[A][B]2, where 1 and 2 are coefficients of A and B in the reaction. for elementary reaction, there is correspondence between rate expression and stoichiometry.
4. for the given reaction A is consumed to form B, but B in turn gives C
hence deltA =- deltaB is not correct how ever, [A]+ [B]+[C]= constant for constant volume system, deltaA+ deltaB+ deltaC= 0 is correct.
5. For composite reaction, the rate expression is not equal to = K[C][D] this is true for elementary reaction only
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