# What is the kinetics of first order reaction?

## What is the kinetics of first order reaction?

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.

## What is the rate law for first order reaction?

The integrated rate law for the first-order reaction A → products is ln[A]_t = -kt + ln[A]_0. Because this equation has the form y = mx + b, a plot of the natural log of [A] as a function of time yields a straight line.

What is the difference between zero and first order kinetics?

The fundamental difference between zero and first-order kinetics is their elimination rate compared to total plasma concentration. Zero-order kinetics undergo constant elimination regardless of the plasma concentration, following a linear elimination phase as the system becomes saturated.

How is first order process calculated?

First-Order Reactions

1. A first-order reaction depends on the concentration of one reactant, and the rate law is: r=−dAdt=k[A] r = − dA dt = k [ A ] .
2. r=−d[A]dt=k[A]
3. 2N2O5(g)→4NO2(g)+O2(g)
4. Rate=k[N2O5]m.
5. rate=k[N2O5]1=k[N2O5]
6. 1.4×10−3=k(0.020)
7. k=0.070s−1.

### What are the characteristics of first order reaction?

Characteristics of first order reaction → The rate constant does not depends upon the concentration of reactant. Half life period for a first order reaction is constant.

• The rate constant does not depends upon the concentration of reactant.
• Half life period for a first order reaction is constant.

### How do you graph a first order reaction?

For a first-order reaction, a plot of the natural logarithm of the concentration of a reactant versus time is a straight line with a slope of −k. For a second-order reaction, a plot of the inverse of the concentration of a reactant versus time is a straight line with a slope of k.

Is 1st order kinetics linear?

Clinical Implications. In clinical pharmacology, first order kinetics are considered as a « linear process », because the rate of elimination is proportional to the drug concentration. This means that the higher the drug concentration, the higher its elimination rate.

What is the difference between first order and second-order kinetics?

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.

## Is first order kinetics dependent on concentration?

First order kinetics is a concentration-dependent process (i.e. the higher the concentration, the faster the clearance), whereas zero order elimination rate is independent of concentration.

## What is half life of first order reaction?

The half-life of a reaction is the time required for a reactant to reach one-half its initial concentration or pressure. For a first-order reaction, the half-life is independent of concentration and constant over time.

Is slope equal to k?

For a second order reaction, as shown in the following figure, the plot of 1/[A] versus time is a straight line with k = slope of the line. Other graphs are curved for a second order reaction.

What is half-life of first order reaction?

### 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.

### Is rate constant positive or negative?

Rate constant k should always be positive. From the Arrhenius Equation, we know k = A x exp(-Ea/RT). “A” (frequency factor) will always be positive because (according to Google) there are no experimental cases where A is negative, and mathematically exp(-Ea/RT) can never be negative.

What is gradient of a line?

In mathematics, the gradient is the measure of the steepness of a straight line. A gradient can be uphill in direction (from left to right) or downhill in direction (from right to left). Gradients can be positive or negative and do not need to be a whole number.

What is the difference between first order kinetics and zero order kinetics?

First Order Kinetics: First order kinetics refers to chemical reactions whose rate of reaction depends on the molar concentration of one reactant. Zero Order Kinetics: Zero order kinetics refers to chemical reactions whose rate of the reaction does not depend on the reactant concentration.