First-order reactions are very common. We have already encountered two examples of first-order reactions: the hydrolysis of aspirin and the reaction of t-butyl bromide with water to give t-butanol. Another reaction that exhibits apparent first-order kinetics is the hydrolysis of the anticancer drug cisplatin.

First order thinking is the process of considering the intended and perhaps obvious implications of a business decision or policy change. Second order thinking is the process of tracing down and unraveling the implications of those first order impacts.

Wiktionary. first-order(Adjective) Describing the simplest of many models, languages, relationship, forms of logical discourse etc, or the first in a numerical sequence of such things.

A Pseudo first-order reaction can be defined as a second-order or bimolecular reaction that is made to behave like a first-order reaction. This reaction occurs when one reacting material is present in great excess or is maintained at a constant concentration compared with the other substance.

The order of reaction can be defined as the power dependence of rate on the concentration of all reactants. Reaction order represents the number of species whose concentration directly affects the rate of reaction. It can be obtained by adding all the exponents of the concentration terms in the rate expression.

The overall order of the reaction is found by adding up the individual orders. For example, if the reaction is first order with respect to both A and B (a = 1 and b = 1), the overall order is 2. We call this an overall second order reaction.

Molecularity cannot be greater than three because more than three molecules may not mutually collide with each other to have an effective collision.

Classifying Chemical Reactions

1. Synthesis reactions. Two or more reactants combine to make 1 new product.
2. Decomposition reactions. A single reactant breaks down to form 2 or more products.
3. Single-replacement reactions.
4. Double-replacement reactions.
5. Combustion reactions.

Therefore, the order of ClO2 C l O 2 is 2 and the order of OH− molecule is 1.

If you get a straight line with a negative slope, then that would be first order. For second order, if you graph the inverse of the concentration A versus time, you get a positive straight line with a positive slope, then you know it’s second order.

: a chemical reaction in which the rate of reaction is constant and independent of the concentration of the reacting substances — compare order of a reaction.

first-order reaction: A reaction that depends on the concentration of only one reactant (a unimolecular reaction). Other reactants can be present, but each will be zero-order.

A second kind of second-order reaction has a reaction rate that is proportional to the product of the concentrations of two reactants. An example of the former is a dimerization reaction, in which two smaller molecules, each called a monomer, combine to form a larger molecule (a dimer).

Thus, the reaction appears to be first order, but it is actually of second order that’s why known as pseudo first order reaction. So, concentration of water can be approximated as constant as its concentration doesn’t change a lot during the reaction. thus, hydrolysis of cane sugar is pseudo first order reaction.

The decomposition of hydrogen peroxide is a first-order reaction, and, as can be shown, the half-life of a first-order reaction is independent of the concentration of the reactant. However, half-lives of reactions with other orders depend on the concentrations of the reactants.