Orders


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Tiffany_Hoang_3C
Posts: 20
Joined: Wed Sep 21, 2016 2:59 pm

Orders

Postby Tiffany_Hoang_3C » Wed Feb 08, 2017 9:53 pm

What does the order (first, second, zero) indicate about a reaction?

Ashley_Thomas_3C
Posts: 20
Joined: Wed Sep 21, 2016 2:56 pm

Re: Orders

Postby Ashley_Thomas_3C » Thu Feb 09, 2017 2:27 am

Changing the concentration of substances taking part in a reaction usually changes the rate of the reaction. A rate equation shows this effect mathematically. Orders of reaction are a part of the rate equation (the exponent). If the order of reaction with respect to A is 0 (zero), this means that the concentration of A doesn't affect the rate of reaction. Mathematically, any number raised to the power of zero (x^0) is equal to 1. That means that that particular term disappears from the rate equation. If a reaction rate depends on a single reactant and the value of the exponent is one, then the reaction is said to be first order. A second order reaction is a type of chemical reaction that depends on the concentrations of one second order reactant or on two first order reactants. Thisreaction proceeds at a rate proportional to the square of the concentration of one reactant or the product of the concentrations of two reactants.


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