Give some example of physical and reversible change ?

Question

Answer

Examples of reversible changes: Melting is when a solid converts into a liquid after heating. An example of melting is turning ice into water. Freezing is when a liquid converts into a solid.
Examples of physical properties include melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density. An example of a physical change is the process of tempering steel to form a knife blade.

Answer

Reversible change ...
1. ice to water 2. folding of paper3. melting of butter4.boiling of water
physical chance 11

Answer

Physical and Reversible Changes

Physical changes involve alterations in the physical properties of a substance without changing its chemical composition. These changes are usually reversible, meaning that the original substance can be recovered. Here are some examples of physical and reversible changes:

1. Melting Ice
- When ice is heated, it absorbs energy and undergoes a physical change by melting into liquid water.
- This change is reversible since when the liquid water is cooled, it reverts back to its solid state as ice.

2. Boiling Water
- When water is heated to its boiling point, it undergoes a physical change by evaporating and turning into steam.
- This change is reversible as the steam can be cooled to form liquid water again.

3. Freezing Water
- When liquid water is cooled below its freezing point, it undergoes a physical change and turns into ice.
- This change is reversible since the ice can be melted to form liquid water.

4. Dissolving Salt in Water
- When salt is added to water, it dissolves and forms a homogeneous mixture.
- This change is reversible as the salt can be separated from the water by evaporating the water, leaving the salt behind.

5. Stretching a Rubber Band
- When a rubber band is stretched, it undergoes a physical change by elongating.
- This change is reversible as the rubber band can be released and returns to its original shape and size.

6. Magnetizing a Piece of Iron
- When a piece of iron is brought close to a magnet, it undergoes a physical change by becoming magnetized.
- This change is reversible as the magnetized iron can be demagnetized by heating it or by subjecting it to a strong magnetic field in the opposite direction.

7. Folding a Piece of Paper
- When a paper is folded, its physical shape is changed, but its chemical composition remains the same.
- This change is reversible as the paper can be unfolded, returning to its original shape.

In summary, physical and reversible changes involve alterations in the physical properties of a substance without changing its chemical composition. These changes can be reversed, allowing the original substance to be recovered. Examples include melting ice, boiling water, freezing water, dissolving salt in water, stretching a rubber band, magnetizing a piece of iron, and folding a piece of paper.

Answer

Physical change = tearing of paperreversible change = kicking a football

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