Why composition reaction is called opposite of decomposition reaction

Question

Answer

Composition reaction which is also know as combination reaction is totaly opposite of decomposition in the following way*In the composition reaction reaction  two or more substance combine together one compound  whereas in the decomposition reaction one compound break down into two or more substance*In the combination reaction ion are exchange to form new single compond  whereas in the decomposition reaction ion are break down to form two or more substance

Answer

Did you mean combination Reaction?If yes it is said opposite because in combination reaction two or more compounds reacts to form a single compound where in decomposition reaction a single compound reacts or break downs into two or more elements or compound.    Ok....   Hello Vaishnavi.

Answer

Introduction:
Composition reaction and decomposition reaction are two types of chemical reactions that involve the rearrangement of atoms and molecules. While decomposition reactions break down compounds into simpler substances, composition reactions create new compounds by combining two or more elements or molecules. In this response, we will explore why composition reactions are considered the opposite of decomposition reactions.

Composition Reaction:
A composition reaction, also known as a synthesis reaction, occurs when two or more substances combine to form a single compound. This type of reaction is characterized by the formation of chemical bonds and the release of energy. For example, the reaction between hydrogen gas (H2) and oxygen gas (O2) to form water (H2O) is a composition reaction:

2H2 + O2 → 2H2O

Decomposition Reaction:
On the other hand, a decomposition reaction involves the breakdown of a compound into its constituent elements or simpler compounds. This type of reaction is characterized by the breaking of chemical bonds and the absorption of energy. An example of a decomposition reaction is the breakdown of hydrogen peroxide (H2O2) into water (H2O) and oxygen gas (O2):

2H2O2 → 2H2O + O2

The Opposites:
Composition and decomposition reactions are considered opposites due to several key factors:

1. Reactants and Products:
In a composition reaction, the number of reactants is less than the number of products. Two or more substances combine to form a single compound. On the other hand, in a decomposition reaction, the number of reactants is greater than the number of products. A compound breaks down into multiple simpler substances.

2. Energy Changes:
A composition reaction is typically exothermic, meaning it releases energy in the form of heat, light, or sound. The formation of chemical bonds during the reaction releases energy. Conversely, a decomposition reaction is usually endothermic, requiring an input of energy to break the existing bonds. Energy is absorbed during the reaction.

3. Bond Formation and Breakage:
Composition reactions involve the formation of new chemical bonds between atoms or molecules. This process results in the creation of a more complex compound. In contrast, decomposition reactions involve the breaking of existing chemical bonds, resulting in the formation of simpler compounds or elements.

Conclusion:
Composition reactions and decomposition reactions are opposite processes in terms of the number of reactants and products, energy changes, and bond formation or breakage. Composition reactions create new compounds by combining elements or molecules, while decomposition reactions break down compounds into simpler substances. Understanding these two types of reactions is crucial in comprehending chemical transformations and the behavior of matter.

Similar Class 10 Doubts

Why are decomposition reactions called the opposite of combination reaction? Write equation for these reactions?

Why are the decomposition of reactions are called opposite of combination reaction . Write equations for these reactions?

The reactions in which more reactive element can displace less reactive element from a compound are called

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