# A Rate Law Relates

A rate law relates the rate of a chemical reaction to the concentrations of the reactants. The rate law is usually expressed in the form:

rate = k[A]^m[B]^n

where k is the rate constant and [A] and [B] are the concentrations of the reactants. The exponents m and n are the orders of reaction with respect to reactant A and reactant B respectively.

The rate law can be used to predict the effect of a change in concentration on the rate of reaction. For example if the concentration of reactant A is doubled then the rate of reaction will increase by a factor of 2^m. Similarly if the concentration of reactant B is tripled then the rate of reaction will increase by a factor of 3^n.

The rate law can also be used to calculate the rate constant k. The rate constant can be determined experimentally by measuring the rate of reaction at different concentrations of the reactants. The rate constant can also be calculated using the Arrhenius equation.

The rate law is an important tool for understanding chemical reactions. It can be used to predict the effect of a change in concentration on the rate of reaction and to calculate the rate constant.

## What is a rate law?

A rate law is an equation which describes how the rate of a reaction changes with reactant concentration.

## How is the rate law determined?

The rate law is determined by performing experiments in which the rate of the reaction is measured at different concentrations of reactants.

## What does the rate law tell us?

The rate law tells us how the rate of the reaction changes with reactant concentration.

## What is the rate constant?

The rate constant is a value that describes how fast the reaction occurs.

## What is the order of the reaction?

The order of the reaction is the exponent of the concentration term in the rate law.

## What is the significance of the order of the reaction?

The order of the reaction tells us how the rate of the reaction changes with reactant concentration.

## What is the difference between first order and second order reactions?

First order reactions depend on the concentration of one reactant while second order reactions depend on the concentration of two reactants.

## How is the rate constant affected by the order of the reaction?

The rate constant is affected by the order of the reaction because it determines how the rate of the reaction changes with reactant concentration.

## How is the rate of the reaction affected by the concentration of the reactants?

The rate of the reaction is affected by the concentration of the reactants because the rate law describes how the rate of the reaction changes with reactant concentration.

## What is the unit of the rate constant?

The unit of the rate constant is the inverse of the unit of concentration.

## What is the significance of the units of the rate constant?

The units of the rate constant tell us how the rate of the reaction changes with reactant concentration.

## What is the difference between a zero order and a first order reaction?

A zero order reaction is one in which the rate is independent of reactant concentration while a first order reaction is one in which the rate is proportional to reactant concentration.

## What is the difference between a first order and a second order reaction?

A first order reaction is one in which the rate is proportional to reactant concentration while a second order reaction is one in which the rate is proportional to the square of reactant concentration.

## What is the difference between a second order and a third order reaction?

A second order reaction is one in which the rate is proportional to the square of reactant concentration while a third order reaction is one in which the rate is proportional to the cube of reactant concentration.

## What is the difference between a third order and a fourth order reaction?

A third order reaction is one in which the rate is proportional to the cube of reactant concentration while a fourth order reaction is one in which the rate is proportional to the fourth power of reactant concentration.