Question

Define reversible and irreversible Changes and physical and chemical changes briefly with examples.

the one who will write the most simple and accurate answer will be marked as brainliest...​

Answer 1

Explanation:

Physical changes are changes that occur in the physical properties of the substance, like shape, size, and nature. Physical changes may or may not be reversible changes. Like, turning of water into ice is an example of reversible changes but growth in height is an irreversible change.

Chemical changes are changes that occur in the chemical properties of the substance like its flammability, radioactivity, etc. All chemical changes are irreversible changes. Once the chemical properties of a substance are changed, it becomes another substance. Thus, it cannot return to its original state.

Examples of reversible changes

Melting: Melting is when solid converts into a liquid after heating. Example of melting is turning of ice into water.

Freezing: Freezing is when a liquid converts into a solid. Example of freezing is turning of water into ice.

Boiling: Boiling is when a liquid converts into a gas. Example of boiling is turning water into water vapour.

Examples of irreversible changes

Burning: When we burn a piece of paper or wood, it turns to ash and smoke. We cannot obtain paper and wood from the ash again.

Cooking: We use heat for cooking, right? Once we cook our eggs, we cannot uncook them. Therefore, cooking is an irreversible change.

Rusting of iron: You must have seen rusting of iron. When water vapour (humidity) comes in contact with the iron, they react. Therefore, iron rusts and once this happens, we cannot reverse it.

Answer 2

Hello Dear

*Reversible changes are the changes in which the same state is obtained in which it was before and no new substance is formed.

Eg - Melting of ice

Φ melting of ice is a reversible change because when it melt the state changes into water from ice but we can restore the previous state . So, it can be reversed and no new substance is formed...

** Irreversible changes are the changes in which different state is obtained from which it was before and new substances is formed.

Eg - burning paper

Φ burning of paper is an Irreversible change because when the paper is burnt the state changes into Ash form from solid paper and the the previous state cannot be retained .

So, it cannot be reversed and new substance is formed .

Hope You have understood !!