Pearson | PTE
Register now for PTE & Unlock 20% OFF : Use promo code: 'C360SPL20'. Valid till 30th NOV'24! Trusted by 3,500+ universities globally
Instantaneous Rate of Reaction is considered one the most difficult concept.
Factors Affecting Rate of Reaction, Factors Affecting Rate of Reaction(2) is considered one of the most asked concept.
115 Questions around this concept.
When comparing two reactions with the same rate constant, which one will have a faster rate?
Consider the consecutive reaction
. Given that rate, constant are respectively. What is the overall rate constant for the consecutive reactions?
, Given that if
New: Direct link to apply for JEE Main 2025 registration for session 1
Also Check: Crack JEE Main 2025 - Join Our Free Crash Course Now!
JEE Main 2025: Sample Papers | Syllabus | Mock Tests | PYQs | Video Lectures
JEE Main 2025: Preparation Guide | High Scoring Topics | Study Plan 100 Days
For a gaseous reaction, the rate of reaction may be expressed in the units
A gaseous reaction, , shows increase in pressure from 100 mm to 140 mm in 10 minutes. The rate of disappearance of is
In a chemical reaction Products, where order of reaction is 1 wrt [A] and 1 wrt [B], which of the following will react at the highest rate?
Which of the following represent the units of rate of reaction?
For the above reaction involving gaseous reactants and gaseous products, the concentration is expressed in terms of pressure. Then the unit of rate of reaction will be:
Consider the reaction:
In the reaction Y is being formed at the rate of .
Calculate overall rate of reaction.
The value of rate of disappearance of was found to be Then choose the correct option:
There are majorly three parameters regarding a chemical reaction:
(1) Feasibility of a reaction
(2) Extent to which a reaction will proceed
(3) Speed of the reaction
We learnt about the feasibility of a reaction in Thermodynamics and about the extent of reaction in Equilibrium. Along with the feasiblity and the extent, it is also important to know the rate and the factors affecting the rate of reaction. Here in Chemical Kinetics, we are going to learn how to answer the above specified questions.
Type of Reaction in terms of their rate:
(1) Very fast reactions:
Some reactions such as ionic reactions occur very fast and it is difficult to calculate the rate of these reactions
e.g. Precipitation of upon mixing aqeuous solutions of and .
(2) Moderate reactions:
These reactions occur at moderate rates and it becomes easier to calculate the rate due to the moderate pace.
e.g. Hydrolysis of esters, inversion of cane sugar etc.
(3) Very slow reactions :
These reactions occur at very slow rates and it becomes very difficult to percieve these changes.
e.g. Rusting of iron, conversion of diamond to graphite.
Rate of reaction
Rate of reaction can be defined in terms of change in concentration of reactant or product in unit time.
To be more specific it can be expressed in terms of
(i) the rate of decrease in concentration of any one of the reactants, or
(ii) the rate of increase in concentration of any one of the products.
There are two types of rates which are generally measured for a chemical reaction
(1) Average Rate
(2) Instantaneous Rate
You will learn about these rates in the subsequent concepts in this chapter.
Average Rate of Reaction:
It is defined as "The rate of change of concentration of a reactant or a product per unit time"
As rate of reaction varies greatly with time, so generally, average reaction rate and instantaneous reaction rates are used.
It is to be noted that rate of reaction is always a positive quantity and hence, there is a negative sign that has to be included in the expression for rate.
However, depending upon the data given in the question, different units may be used.
Instantaneous Rate of Reaction
As the average reaction rate fails to predict the rate at a particular moment of time so we use instantaneous rate which is equal to a small change in concentration (dx) during a small interval of time (dt). It is given as dx/dt.
It can be written for any of the reactant or the product in terms of stoichiometric coefficients Vj which is negative for reactants and positive for products as follows:
For example, if we have the reaction
There are various factors on which the rate of reaction depends:
"Stay in the loop. Receive exam news, study resources, and expert advice!"