Type of Chemical Reactions with Complete detail
The topic “Type of chemical reaction” is very important to understand for all science students and the students who are going to appear in national talent hunt or scholarship entrance exams and other entrance exams. The topic “Type of chemical reaction” will help you to clear many of the doubts which were not cleared to you in earlier classes.”Type of chemical reaction” is the basic topic of chemistry so without studying it you can’t go in deep of the chemistry.
We have learned that during a chemical reaction atoms of one element do not change into atoms of another element, nor do atoms disappear from the mixture or appear from elsewhere. Actually, chemical reactions involve the breaking and making of bonds between atoms to produce new substances.
Click for online shopping
Future Study Point.Deal: Cloths, Laptops, Computers, Mobiles, Shoes etc
You can also study
What are the physical and chemical properties of metals?
NCERT Solutions Class 10 Science from chapter 1 to 16
Class 10 chemistry Viva Voce Questions and Answers
Class 10 Chemistry Practical Based Questions and Answers
What is the atom, molecule, and atomicity of a substance?
How to determine Valency,net charge of an ion and Molecular formula of a substance.
What is an atom,molecule and atomicity of a substance?
What is pH value and its importance in everyday life.
Chemical properties of Acid and Bases-A note for grade 10 students
What are the physical and chemical properties of metals?
Difference between soaps and detergents
Class 10 chapter 2 science notes on salts
Extraction of metals as per the activity series
Ionic and covalent compounds and the difference between them
Trends in the property of element from left to right and up to down in the modern periodic table.
Type of Chemical Reactions with Complete detail
COMBINATION REACTIONS
In this chemical reaction, two or more compounds form a single compound.In the following chemical reaction, Calcium oxide reacts vigorously with water to produce slaked lime (calcium hydroxide) releasing a large amount of heat.
In this reaction, calcium oxide and water combine to form a single product, calcium hydroxide. Such a chemical reaction in which a single product is formed from two or more reactants is known as a combination reaction.
There are several examples of combination reaction, as an example burning of coal, the formation of water from hydrogen and oxygen.
We also observe that in most of the combination reaction heat is evolved, such a combination reaction in which heat is also released known as exothermic reactions. So we can say every exothermic reaction is a combination reaction but it is not necessary that every combination reaction is exothermic, the exothermic reaction is a special case of combination reaction in which heat is released.
The formation of slaked lime with the release of heat from quick lime and water is an example of an exothermic reaction, burning of coal and formation of water are also the examples of exothermic reaction there are several examples of exothermic reactions, some of them are following.
(i) Burning of natural gas
(ii) Respiration reaction is an example of exothermic reaction. During digestion of food carbohydrate broken down into glucose, this glucose combines with oxygen in the cells of our body and forms carbon dioxide and water with the release of energy
DECOMPOSITION REACTIONS
This is the reaction in which one product is broken down into two or more products
In this reaction, you can observe that a single reactant breaks down to give simpler products. This is a decomposition reaction. Ferous sulphate crystals lose water when heated and the colour of the crystal changes from light green to white. On further heating white colour changes to dark brown due to the formation of black coloured solid substance ferric oxide
, sulphur dioxide
and sulphur trioxide
. Ferric oxide is a solid, while
and
are gases.
Type of Decomposition reaction
(1) Thermal decomposition reaction-When a product is decomposed to simple products after heating it . Decomposition of calcium carbonate to calcium oxide and carbon dioxide on heating is an important thermal decomposition reaction used in various industries. Calcium oxide is called lime or quick lime. It has many uses – one is the manufacture of cement.
When potassium chlorate is heated it changes to potassium chloride and oxygen.
When ferric hydroxide heated it is decomposed into ferric oxide and water.
(2) Electrolysis-When an electric current is passed through an aqueous solution of a compound and it undergoes the process of decomposition then it is known as electrolysis.
The best example of electrolysis is the electrolysis of water and sodium chloride.
When an electric current is allowed to pass through water contained in an electrolytic device then water is decomposed into oxygen and hydrogen which collected at cathode and anode respectively.
When electrolysis occurs through an aqueous solution of sodium chloride, it is decomposed into sodium and chlorine, sodium is collected at cathode and chlorine is collected at the anode.
(3) Photo Decomposition- When sunlight is exposed to some substances then decomposition occurs known as photodecomposition.
Placing a small quantity of silver chloride on a glass plate, when sunlight is allowed to pass through it, the white crystals of silver chloride changes to grey color due to the decomposition of silver chloride into silver which is grey in color and chlorine.
Silver bromide also undergoes photodecomposition in the same way
DISPLACEMENT REACTION
The type of chemical reaction in which an atom of high reactive substance displaces an atom of less reactive substance from the molecule of another substance forming a new compound, such a reaction is known as displacement reaction.
Example-The iron nail dipped into the copper solution, changes the blue color of copper sulfate faded and changes to green color due to the displacement reaction.
In this reaction iron being more reactive than copper displaces copper atom ad substitutes it forming iron sulfate.
Other similar examples of displacement reactions are following.
Both of the above reaction shows that zinc and lead is more reactive than copper.
DOUBLE DISPLACEMENT REACTION
The reaction in which there are an exchange of ions between two reactants are called a double displacement reaction
An aqueous solution of sodium sulfate when allowed to mix up with the aqueous solution of barium chloride, an insoluble substance is formed which is precipitated at the bottom of the test tube, such a reaction is also known as a precipitation reaction
OXIDATION REACTION
Oxidation is the loss of electrons during a reaction by a molecule, atom, or ion. Oxidation occurs when the oxidation state of a molecule, atom, or ion increased.
Example:
Oxidation is when iron combines with oxygen to form iron oxide or rust. The iron is said to have oxidized into rust.
The chemical reaction is:
The iron metal is oxidized to form the iron oxide known as rust.
REDUCTION REACTION
The reduction is the gain of electrons during a reaction by molecule, atom or ion. Reduction occurs when the reduction state of a molecule, atom, or ion decreased.
Example:
The reaction between copper oxide and magnesium to yield copper and magnesium oxide:
REDOX REACTION
A reaction in which one reactant undergoes oxidation whereas the other gets reduced during the course of reaction are termed as oxidation-reduction reactions or redox reactions.
Example:
Fe2O3 + 3CO ⇒ 3Fe + CO2
Here ferric oxide is reduced to iron and carbon monoxide is oxidized to carbon dioxide, ferric oxide is known as oxidizing agent and carbon mono oxide is a reducing agent.
CORROSION
You must have observed that iron particles are shiny when new, but for some time.get coated with a reddish row powder when left for some time. This process is commonly known as rusting of iron. Some other metals also get tarnished in this manner. Have you noticed the colour of the coating formed on copper and silver? When a metal is attacked by substances around it such as moisture, acids, etc., it is said to corrode and this process is called corrosion. The black coating on silver and the grey coating of copper are other examples of corrosion.
Corrosion causes damage to car bodies, bridges, iron railings, ships and to all objects made of metals, especially those of iron. Corrosion of iron is a serious problem. Every year an enormous amount of money is spent to replace damaged iron.
RANCIDITY
Have you ever tasted or smelt the fat/oil containing food materials left for a long time?
When fats and oils are oxidized, they become rancid and their smell and taste change. Usually, substances that prevent oxidation (antioxidants) are added to foods containing fats ad oils. Keeping food in airtight containers helps to slow down oxidation. Do you know that chips manufacturers usually flush bags of chips with gas such as nitrogen to prevent the chips from getting oxidized?
Selection of subjects or a coarse : A turning point of life
Important Science Notes for Class 9 and 10 grade
Class 10 CBSE Science Notes
Class 10 Biology Viva Voce Questions and Answers for CBSE Board 2020-21
Class 10 Physics Viva Voce Questions and Answers
Ozone Layer and How it is Getting depleted.
Myopia, Hypermetropia and Presbyopia
Human eye structure and its function
Electrical resistance and conductance
Electric Current and Heating effect of Electric Current
What is a potential difference across an electric field ?
Why do the star twinkle but planets don’t
Light reflection, refraction, scattering, and dispersion
Food chain and food web in an ecosystem
Class 9 CBSE Science Notes
Three Laws of Motion: Class 9 CBSE
Evoporation,Vapourization and Latent heat -Class 9 CBSE notes
What is an atom,molecule and atomicity of a substance?
How to determine Valency,net charge of an ion and Molecular formula of a substance.
Thrust and Pressure : Difference
The Complete Detail of Archimedes Principal
Average Speed and Average Velocity: Differences
How to evaluate recoil velocity of gun
If energy is conserved then why do we need to save it for future generations?
Molar mass,molecular mass and mole concept
What is second law of of motion ?
What is universal law of gravitational force
NCERT Solutions of Science and Maths for Class 9,10,11 and 12
NCERT Solutions for class 9 maths
NCERT Solutions for class 9 science
CBSE Class 9-Question paper of science 2020 with solutions
CBSE Class 9-Sample paper of science
CBSE Class 9-Unsolved question paper of science 2019
NCERT Solutions for class 10 maths
CBSE Class 10-Question paper of maths 2021 with solutions
CBSE Class 10-Half yearly question paper of maths 2020 with solutions
CBSE Class 10 -Question paper of maths 2020 with solutions
CBSE Class 10-Question paper of maths 2019 with solutions
NCERT Solutions for Class 10 Science
Solutions of Class 10 Science Sample Paper and Question Papers for Term-1 and Term 2 2021-22 CBSE Board
Solution of Class 10 Science Question Paper Preboard 2021-22:Term 2 CBSE Board Exam
Solutions of Class 10 Science Sample Paper Term-1 2021-22 CBSE Board
Class 10 Science Sample Paper for Term 2 CBSE Board Exam 2021-22 with Solution
Solutions of Class 10 Science Question Paper Preboard Examination (First) 2021 -22 Class 10 Science
CBSE Class 10 – Question paper of science 2020 with solutions
CBSE class 10 -Sample paper of Science 2020
NCERT Solutions for class 11 maths
| Chapter 1-Sets | Chapter 9-Sequences and Series |
| Chapter 2- Relations and functions | Chapter 10- Straight Lines |
| Chapter 3- Trigonometry | Chapter 11-Conic Sections |
| Chapter 4-Principle of mathematical induction | Chapter 12-Introduction to three Dimensional Geometry |
| Chapter 5-Complex numbers | Chapter 13- Limits and Derivatives |
| Chapter 6- Linear Inequalities | Chapter 14-Mathematical Reasoning |
| Chapter 7- Permutations and Combinations | Chapter 15- Statistics |
| Chapter 8- Binomial Theorem | Chapter 16- Probability |
CBSE Class 11-Question paper of maths 2015
CBSE Class 11 – Second unit test of maths 2021 with solutions
NCERT solutions for class 12 maths
| Chapter 1-Relations and Functions | Chapter 9-Differential Equations |
| Chapter 2-Inverse Trigonometric Functions | Chapter 10-Vector Algebra |
| Chapter 3-Matrices | Chapter 11 – Three Dimensional Geometry |
| Chapter 4-Determinants | Chapter 12-Linear Programming |
| Chapter 5- Continuity and Differentiability | Chapter 13-Probability |
| Chapter 6- Application of Derivation | CBSE Class 12- Question paper of maths 2021 with solutions |
| Chapter 7- Integrals | |
| Chapter 8-Application of Integrals |
Class 12 Solutions of Maths Latest Sample Paper Published by CBSE for 2021-22 Term 2
Class 12 Maths Important Questions-Application of Integrals
Solutions of Class 12 Maths Question Paper of Preboard -2 Exam Term-2 CBSE Board 2021-22
Solutions of class 12 maths question paper 2021 preboard exam CBSE
