Explain with example all 5 types of chemical reactions.
Types Of Chemical Reactions
A chemical reaction is a process in which various compounds/elements having different characteristics react with each other to form a product with different physical and chemical properties.
In other words, it is a process in which various atoms present in a compound/element rearrange to form a new substance.
While this reaction takes place, the substances that are combined (to form a new product) are known as Reactants. On the other hand, the substance that is formed as an outcome of reaction between the reactants is known as Products.
There are various types of chemical reactions. Some of them are:
1. Combination Reaction
2. Displacement Reaction
3. Double-Displacement Reaction
4. Decomposition Reaction
5. Neutralization Reaction
Here is a detailed explanation of the above-listed types of chemical reactions.
· Combination Reaction
This is a basic reaction in which two or more substances combine to form a new substance as a result. It is commonly known as a Synthesis Reaction. In the form of the equation, it can be depicted as
A + B → AB
Example of a combination reaction-
2Na (s) + Cl2 (g) → 2NaCl (s)
2Mg (s) + O2 (g) → 2MgO (s)
· Displacement Reaction
This is a reaction in which one element of a given compound displaces or replaces a similar element of another compound. It is commonly known as a Single-Displacement Reaction. In the form of the equation, it can be depicted as
A + BC → AC + B
Example of displacement reaction-
Zn (s) + 2HCl (aq) → ZnCl2 (aq) + H2 (g)
· Double-Displacement Reaction
This is a reaction in which a positive and a negative ion (present in the given two ionic compounds) changes its position or gets displaced to form new compounds. In the form of the equation, it can be depicted as
AB + CD → AD + CB
Example of double-displacement reaction-
2KI (aq) + Pb(NO3)2 (aq) → 2KNO3 (aq) + PbI2 (s)
· Decomposition Reaction
This reaction is the reverse of the combination reaction. In this reaction, a compound breaks down into two or more simple substances. Most decomposition reactions require an input of energy in the form of heat, light, or electricity. In the form of the equation, it can be depicted as
AB → A + B
Example of decomposition reaction-
2HgO (s) → 2Hg (l) + O2 (g)
· Neutralization Reaction
This is a basic reaction in which an acid and base combine to form a product that is usually salt or water. In the form of the equation, it can be depicted as
Acid + Base → Salt + Water
Example of neutralization reaction-
HCl + NaOH → H2O + NaCl
NOTE:
1. It is very important to balance the reactions.
2. It is important to remember the seven elements that exist in nature as diatomic molecules.
I hope the answer helps you!
– Written By Aparajita Karmakar
There are a lot more types of chemical reactions, but dealing with all of them is not so feasible. Many chemical reactions can be classified as one of five basic types. Having a thorough understanding of these types of reactions will be useful for predicting the products and giving a proper base to understand the core and advanced concepts. The five basic types of chemical reactions are combination, decomposition, single-replacement, double-replacement, and combustion. Analyzing the reactants and products of a given reaction will allow you to place it into one of these categories. Some reactions will fit into more than one category.
A combination reaction, also known as a synthesis reaction, is a reaction in which two or more substances combine to form a single new substance. Combination reactions can also be called synthesis reactions. The general form of a combination reaction is:
A+B=AB
A decomposition reaction is a reaction in which a compound breaks down into two or more simpler substances. The general form of a decomposition reaction is:
AB=A+B
A single-replacement reaction is a reaction in which one element replaces a similar element in a compound. The general form of a single-replacement (also called single-displacement) reaction is:
A+BC=AC+B
A double-replacement reaction is a reaction in which the positive and negative ions of two ionic compounds exchange places to form two new compounds. The general form of a double-replacement (also called double-displacement) reaction is:
AB+CD=AD+BC
A combustion reaction is a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat. Combustion reactions must involve O2 as one reactant. The combustion of hydrogen gas produces water vapor.
– Written By Tanya
