Question

Limestone decomposition is an example of reversible as well as irreversible chemical change.

Answer 1

Explanation:

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Answer:

Irreversible Reactions

A fundamental concept of chemistry is that chemical reactions occurred when reactants reacted with each other to form products. These unidirectional reactions are known as irreversible reactions, reactions in which the reactants convert to products and where the products cannot convert back to the reactants. These reactions are essentially like baking. The ingredients, acting as the reactants, are mixed and baked together to form a cake, which acts as the product. This cake cannot be converted back to the reactants (the eggs, flour, etc.), just as the products in an irreversible reaction cannot convert back into the reactants.

An example of an irreversible reaction is combustion. Combustion involves burning an organic compound—such as a hydrocarbon—and oxygen to produce carbon dioxide and water. Because water and carbon dioxide are stable, they do not react with each other to form the reactants. Combustion reactions take the following form:

CxHy+O2→CO2+H2O(1)

Reversible Reactions

In reversible reactions, the reactants and products are never fully consumed; they are each constantly reacting and being produced. A reversible reaction can take the following summarized form:

A+B⇌k1k−1C+D(2)

This reversible reaction can be broken into two reactions.

Reaction 1:

A+B−→k1C+D(3)

Reaction 2:

C+D−→−k−1A+B(4)

These two reactions are occurring simultaneously, which means that the reactants are reacting to yield the products, as the products are reacting to produce the reactants. Collisions of the reacting molecules cause chemical reactions in a closed system. After products are formed, the bonds between these products are broken when the molecules collide with each other, producing sufficient energy needed to break the bonds of the product and reactant molecules.

Below is an example of the summarized form of a reversible reaction and a breakdown of the reversible reaction N2O4 ↔ 2NO2

Reaction 1 and Reaction 2 happen at the same time because they are in a closed system.

Imagine a ballroom. Let reactant A be 10 girls and reactant B be 10 boys. As each girl and boy goes to the dance floor, they pair up to become a product. Once five girls and five boys are on the dance floor, one of the five pairs breaks up and moves to the sidelines, becoming reactants again. As this pair leaves the dance floor, another boy and girl on the sidelines pair up to form a product once more. This process continues over and over again, representing a reversible reaction.

Unlike irreversible reactions, reversible reactions lead to equilibrium: in reversible reactions, the reaction proceeds in both directions whereas in irreversible reactions the reaction proceeds in only one direction. To learn more about this phenomenon, click here: Chemical Equilibrium

If the reactants are formed at the same rate as the products, a dynamic equilibrium exists. For example, if a water tank is being filled with water at the same rate as water is leaving the tank (through a hypothetical hole), the amount of water remaining in the tank remains consistent.

Explanation:

Answer 2

Answer:

Explanation:

When the first decomposition occurs, it will be irreversible, but if we combine calcium oxide and carbon dioxide separately, we will unquestionably produce calcium carbonate. Therefore, we can infer that this is a reversible reaction.

Reversible definition:

Reversible processes allow the system and its surroundings to revert to their original conditions by taking the opposite direction.

Irreversible definition:

Any process that is irreversible prevents the system and its surroundings from returning to their original configurations.

Limestone definition:

Calcium carbonate ($CaCO3$), typically in the form of calcite or aragonite, is the main component of limestone, a sedimentary rock. Additionally, it could include sizable levels of magnesium carbonate (dolomite). However, trace amounts of quartz, feldspar, pyrite, clay, and iron carbonate are also frequently found.

Decomposition definition:

• To transform into simpler components or substances, especially by the action of living organisms (as bacteria and fungi) The woodland floor saw the breakdown of leaves.
• To divide a material into more basic compounds Hydrogen and oxygen are produced when water is broken down. decompose.

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