The rate of a chemical reaction depends on the concentrations of the reactants.

Question

The rate of a chemical reaction depends on the concentrations of the reactants. Let's consider the general reaction between A and B: aA + bB cC + dD The dependence of the reaction rate on the concentration of each reactant is given by the equation called the rate law. rate = k[A]m[B]n where k is a proportionality constant called the rate constant. The exponent m determines the reaction order with respect to A, and n determines the reaction order with respect to B. The overall reaction order equals the sum of the exponents (m + n). For example, if m = 2 and n = 2 then rate = k[A]2 [B]2 and the overall reaction order is 2 + 2 = 4. The reaction orders are experimentally determined and usually not related to the reaction stoichiometric coefficients a and b. The reaction of ethyl bromide with sodium hydroxide, CH3CH2Br(aq) + NaOH(aq) CH3CH2 OH(aq) + NaBr(aq) is first order in CH3CH2Br and first order in NaOH . If the concentration of CH3CH2Br was increased by half and the concentration of NaOH was quadrupled, by what factor would the reaction rate increase? Express your answer numerically.

Explanation / Answer

rate = [CH3CH2Br][NaOH] = 1*1

= (3/2)* 4 = 6

so the rate will be 6 times.

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