Practicing Success
Rate of a reaction decreases with the passage of time as the concentration of reactants decrease. Conversely, rates generally increase when reactant concentrations increase. So, rate of a reaction depends upon the concentration of reactants. Consider a general reaction aA + bB → cC + dD where a, b, c and d are the stoichiometric coefficients of reactants and products. The rate expression for this reaction is Rate ∝ [A]x [B]y where exponents x and y may or may not be equal to the stoichiometric coefficients (a and b) of the reactants. Above equation can also be written as Rate = k [A]x [B]y -\(\frac{dR}{dT}\) = k [A]x [B]y This form of equation is known as differential rate equation, where k is a proportionality constant called rate constant. |
If the concentration units are increased by n times, then what will be the effect on the value of rate constant of the first order? |
Increase by n times Decrease by n times Not changed None of these |
Not changed |
If the concentration units are increased by n times, rate constant will remain the same in a chemical reaction. |