# What Is Rate Law In Chemistry

In chemistry the rate law is the relationship between the rate of a reaction and the concentrations of the reactants. The rate law can be used to determine the rate constant k for a given reaction. The rate constant is a measure of the rate of the reaction and is specific to the reaction and the temperature. The rate law is usually expressed in the form:

rate = k[A]^x[B]^y

where k is the rate constant [A] and [B] are the concentrations of the reactants and x and y are the reaction orders. The reaction orders are the powers to which the concentrations of the reactants are raised. The sum of the reaction orders is the overall order of the reaction.

The rate law can be used to determine the rate of the reaction for a given set of concentrations of the reactants. For example if the rate law is rate = k[A]^2[B] then the rate of the reaction will be doubled if the concentration of A is doubled while the concentration of B is held constant. If the concentration of B is doubled while the concentration of A is held constant then the rate of the reaction will be quadrupled.

The rate law can also be used to predict the effect of a change in temperature on the rate of the reaction. For example if the rate law is rate = k[A]^2[B] then doubling the temperature will quadruple the rate of the reaction.

The rate law is a powerful tool for understanding the factors that affect the rate of a chemical reaction. By understanding the rate law chemists can design experiments to study the effect of these factors on the rate of the reaction.

## What is the rate law in chemistry?

Answer: The rate law is the mathematical expression that describes how the rate of a chemical reaction changes with respect to the concentrations of the reactants.

## What is the rate constant?

Answer: The rate constant is a measure of the speed of a chemical reaction.

It is a proportionality constant that relates the rate of the reaction to the concentrations of the reactants.

## What is the order of a reaction?

Answer: The order of a reaction is the power to which the concentration of a reactant is raised in a rate law expression.

The order of a reaction can be zero first second or third.

## What is the rate law expression?

Answer: The rate law expression is a mathematical expression that describes how the rate of a chemical reaction changes with respect to the concentrations of the reactants.

## What is the meaning of a zero order reaction?

Answer: A zero order reaction is one in which the rate of the reaction is independent of the concentrations of the reactants.

## What is the meaning of a first order reaction?

Answer: A first order reaction is one in which the rate of the reaction is proportional to the concentration of one of the reactants.

## What is the meaning of a second order reaction?

Answer: A second order reaction is one in which the rate of the reaction is proportional to the square of the concentration of one of the reactants.

## What is the meaning of a third order reaction?

Answer: A third order reaction is one in which the rate of the reaction is proportional to the cube of the concentration of one of the reactants.

## What is the units of the rate constant?

Answer: The units of the rate constant depend on the order of the reaction.

For a zero order reaction the units of the rate constant are molecules per unit time.

For a first order reaction the units of the rate constant are inverse seconds.

For a second order reaction the units of the rate constant are inverse seconds squared.

For a third order reaction the units of the rate constant are inverse seconds cubed.

## How do you calculate the rate constant?

Answer: The rate constant can be calculated from the rate law expression by plugging in the known values of the concentrations of the reactants and the rate of the reaction.

## How do you calculate the order of a reaction?

Answer: The order of a reaction can be calculated from the rate law expression by observing the power to which the concentration of a reactant is raised.

## What is the difference between the rate law and the rate constant?

Answer: The rate law is the mathematical expression that describes how the rate of a chemical reaction changes with respect to the concentrations of the reactants.

The rate constant is a measure of the speed of a chemical reaction.

It is a proportionality constant that relates the rate of the reaction to the concentrations of the reactants.

## What is the difference between the rate expression and the rate law?

Answer: The rate expression is the mathematical expression that describes how the rate of a chemical reaction changes with respect to the concentrations of the reactants.

The rate law is the mathematical expression that describes how the rate of a chemical reaction changes with respect to the concentrations of the reactants.

## What is the difference between the rate law and the order of a reaction?

Answer: The rate law is the mathematical expression that describes how the rate of a chemical reaction changes with respect to the concentrations of the reactants.

The order of a reaction is the power to which the concentration of a reactant is raised in a rate law expression.

## What is the difference between the rate law expression and the rate law?

Answer: The rate law expression is a mathematical expression that describes how the rate of a chemical reaction changes with respect to the concentrations of the reactants.

The rate law is the mathematical expression that describes how the rate of a chemical reaction changes with respect to the concentrations of the reactants.