Difference Between Chemical Reaction and Physical Reaction

Core difference

The main difference between chemical reaction and physical reaction is that the chemical reaction is the type of reaction that causes the chemical transformation of the reactants while the physical reaction is the reaction that causes the molecular rearrangement of the reactants to produce a change. physical…

Chemical reaction vs physical reaction

A chemical reaction is the type of reaction that causes the change in the internal structure of the substance in such a way that the formation of a new substance occurs, for example, burning of paper or wood, etc. On the other hand, physical reaction is the type of reaction that causes the change in the physical characteristics of the substance without altering its internal structure, for example, freezing or melting of water.

So, a chemical reaction is a reaction that causes a change in the composition and chemical properties of the reactant. On the other hand, the physical reaction causes a change in the physical properties of the reactant, for example, color, shape, and size, etc. Therefore, a chemical reaction causes the formation of a new product, while no new product is formed. during a physical reaction.

A chemical reaction is an irreversible type of reaction, that is, the original matter cannot be recovered after the reaction. On the other hand, physical reaction is a reversible type of reaction, that is, the original matter can be recovered after the reaction. Also, the energy absorbed or evolved during a chemical reaction. On the other hand, there is no absorption or evolution of energy during a physical reaction.

Comparison chart

Chemical reaction physical reaction
A type of reaction that causes the change in the internal structure of the substance is known as a chemical reaction. A type of reaction that causes the change in the physical characteristics of the substance without altering its internal structure is known as a physical reaction.
Change of Properties
It causes a change in the chemical properties and composition of the reagent. The physical reaction causes the change in the physical properties of the reactant, for example, color, shape and size, etc.
reaction type
A chemical reaction is a type of irreversible reaction. The physical reaction is a type of reversible reaction.
original matter
During a chemical reaction, the original matter cannot be recovered after the reaction is complete. During the physical reaction, the original matter can be recovered after the reaction is complete.
New product training
The chemical reaction causes the creation of a new product. No new product is formed during a physical reaction.
Energy
Energy absorbed or evolved during a chemical reaction. During a physical reaction, there is no evolution or absorption of energy.
Using the equation
Chemical reactions can be expressed using a chemical equation. The physical reaction cannot be expressed by the equation.
examples
Examples of a chemical reaction are rusting of iron, burning of paper or wood, and setting of curd, etc. Examples of physical reactions are cutting down trees, freezing or melting water, ripping paper, etc.
What is chemical reaction?

A chemical reaction is a type of reaction that causes the chemical transformation of reactants. Alchemists first of all studied chemical transformations in the Middle Ages. They attempted to turn lead into gold using lead-copper alloys and lead with sulfur.

During a chemical reaction, two or more reactants combine to make a new or different product. In this type of reaction, the bonds between the reactant atoms are broken so that they rearrange to form new compounds. This new product that has been obtained after the completion of the reaction cannot be converted back into reagents, which is why it is known as an irreversible reaction.

During a chemical reaction, a chemical change occurs that changes the chemical properties of the substance and transforms it into a different substance that has different chemical compositions. Some signs of chemical change are energy evolution, smell change, bubble formation and temperature change etc.

In addition, it also involves the absorption and evolution of energy. It requires specific conditions to initiate a chemical reaction. Mainly, the rate of a reaction increases with increasing temperature. It provides more thermal energy to reach the activation energy of the reaction, which is essential to break the bonds between atoms.

A chemical reaction can be expressed in the form of an equation that is called a chemical equation. This nominal or symbolic chemical equation represents the starting or reacting compounds, the final products and the reaction situation of the chemical reaction. Sometimes it also represents the intermediate products of the reaction.

examples

Fireworks, rotten bananas, fermenting grapes, burning paper or wood, adding vinegar to baking soda, bleaching a stain, etc. are examples of chemical reactions. Once these reactions are complete, they cannot become reactive again.

What is physical reaction?

Physical reaction is a type of reaction that causes the molecular rearrangement of reactants to produce a physical change. These changes affect the shape of a chemical compound but do not change its chemical composition. So, it only involves the change in physical properties of the reactant i.e. resistance change, crystal shape changes, durability change, texture change, size, color, shape, volume and density etc.

So any change in color, shape, or smell represents a physical change. No new product is formed during a physical reaction. It does not imply evolution or absorption of energy. Furthermore, these types of changes are reversible, that is, the product can be transformed back into reactants. It cannot be expressed in equation form.

examples

Molding clay into a new shape, boiling water, melting butter on warm toast, crumpling paper, freezing a juice box in the freezer, melting wax, dissolving sugar in water, cutting wood, etc. are some examples. of physical reactions. All these changes are reversible, that is, the reagent can be achieved again.

Key differences

  1. A type of reaction that causes the change in the internal structure of the substance is known as a chemical reaction, while a type of reaction that causes the change in the physical characteristics of the substance without changing its internal structure is known as a physical reaction.
  2. The chemical reaction causes a change in the composition and chemical properties of the reagent. On the other hand, the physical reaction causes a change in the physical properties of the reactant, for example, color, shape, and size, etc.
  3. A chemical reaction is an irreversible or unchangeable type of reaction. On the contrary, the physical reaction is a type of reversible reaction.
  4. During a chemical reaction, the original matter cannot be recovered after the reaction is complete. On the other hand, in a physical reaction, the original matter can be recovered after the reaction is complete.
  5. The chemical reaction causes the formation of a new product. On the other hand, there is no formation of a new product during a physical reaction.
  6. Chemical reactions can be expressed using an equation that is known as a chemical equation, while; the equation cannot express the physical reaction.
  7. The chemical reaction causes the evolution or absorption of energy. On the other hand, there is no evolution or absorption of energy during a physical reaction.
  8. Examples of a chemical reaction are rusting of iron, burning of paper or wood, and setting of curd, etc., while examples of a physical reaction are cutting down trees, freezing or melting water, and tearing paper, etc. .

conclusion

The above discussion summarizes that chemical reaction and physical reaction are the two types of reactions. A chemical reaction is a type of irreversible reaction that causes the formation of a new product by changing the chemical properties of the reactants. On the other hand, physical reaction is a type of reversible reaction that causes a change in the physical properties of the reactants.

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