First order kinetics equation
What is the first order of kinetics?
An order of chemical reaction in which the rate of the reaction depends on the concentration of only one reactant, and is proportional to the amount of the reactant. It may be represented by the equation, rate = kA, where k is the reaction rate constant, and A is the concentration of the reactant.
Which expression is correct for first order kinetics?
Which of the followoing expression is correct for first order reaction ? (CO) refers to initial concentration of reactant. Solution : t1/2∝(CO)∘ i.e. half life for Ist order is independent of initial concentration.
What is first order reaction give example?
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.
What does a first order reaction mean?
Definition of first-order reaction : a chemical reaction in which the rate of reaction is directly proportional to the concentration of the reacting substance — compare order of a reaction.
What is pseudo 1st order reaction?
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.
What are first order drugs?
“First-order kinetics is where a constant fraction of drug in the body is eliminated per unit of time” This is a logarithmic function. All enzymes and clearance mechanisms are working at well below their maximum capacity, and the rate of drug elimination is directly proportional to drug concentration.
Is Half Life a first order reaction?
Figure 2: Half lives graphically demonstrated for first-order reaction. Notice the the half-life is independent of initial concentration. This is not the case with other reaction orders. The half-life of a first-order reaction was found to be 10 min at a certain temperature.
How do you do a first order reaction?
Key Pointsk is the first-order rate constant, which has units of 1/s.The method of determining the order of a reaction is known as the method of initial rates.The overall order of a reaction is the sum of all the exponents of the concentration terms in the rate equation.
What is first order elimination?
Definition. First-order elimination kinetics depends on the concentration of only one reactant (drug) and a constant fraction of the drug in the body is eliminated per unit time. The rate of elimination is proportional to the amount of drug in the body. The majority of drugs are eliminated in this way.
What is order reaction?
The Order of Reaction refers to the power dependence of the rate on the concentration of each reactant. Thus, for a first-order reaction, the rate is dependent on the concentration of a single species. The words “order of reaction” may also be used to refer to the mechanism of a reaction.
What is first order and second order reaction?
A first-order reaction rate depends on the concentration of one of the reactants. A second-order reaction rate is proportional to the square of the concentration of a reactant or the product of the concentration of two reactants.
What is a zero order reaction?
Definition of zero-order reaction : 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.
What is rate constant k?
The specific rate constant (k) is the proportionality constant relating the rate of the reaction to the concentrations of reactants. The rate law and the specific rate constant for any chemical reaction must be determined experimentally. The value of the rate constant is temperature dependent.