If the rate-determining step of a reaction is this is an image of a chemical equation. a + 2b, reaction arrow, c. , the reaction rate is represented by (assume it is third order overall and the concentration of b is a bigger rate determinant than concentration of a):
a. k[a] 2[b]
b. k[a][b]2
c. k[b]2
d. k[a][b]2[c]

The reaction rate of a chemical reaction is determined by the slow step in the reaction mechanism.

The rate ii given by the product of the species of the determining step, each raised to its coeeficient in the chemical reaction that represents this step.

So, given that the determining step is represented by  A + 2B→C, the reaction rate is r = k[A]*[B]^2.

This mechanism is verified becasue the total order is the summ of the coefficientes : 1 + 2 = 3 and the exponent 2 makes B is a bigger rate determinant than A.

So, the answer is the option b. k[A][B]^2.

The correct answer would be b) volume versus temperature, because they are also directly proportional.

"electrical energy" transforms to "thermal energy".hope my answer has you : )