most physical changes are reversible. Give reasons with two examples.
Sriyansh Vyas answered this
no because there are many physical changes which are irreversible
Ex . (1) grains to flour (2) cooking of food
Ex . (1) grains to flour (2) cooking of food
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Suryansh Singh answered this
the reason is :-
Physical changes occur when objects or substances undergo a change that does not change their chemical composition. ... In general a physical change is reversible using physical means. For example, salt dissolved in water can be recovered by allowing the water to evaporate.
Physical changes occur when objects or substances undergo a change that does not change their chemical composition. ... In general a physical change is reversible using physical means. For example, salt dissolved in water can be recovered by allowing the water to evaporate.
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Navneet answered this
Kneading of flour and conversion of water into ice
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Diya answered this
Because no new substance is formed and the chemical composition remains the same. Eg - folding of paper , melting of ice
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Sonu Mishra answered this
same as navneet
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Neeraj Kumar Sahu answered this
- 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.
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Deeksha Chauhan answered this
Changes that occur repeatedly after regular intervals of time and whose occurrence can be predicted are known as periodic change.
For example. Day and night, heartbeat etc.
For example. Day and night, heartbeat etc.
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Manas Gurang answered this
Ruber band
Ice cube
Ice cube
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Sagar Yadav answered this
1. Water to vapour.
2. Vapour to water.
3.Water to ice.
4. Ice to water
2. Vapour to water.
3.Water to ice.
4. Ice to water
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Pranathi answered this
In general a physical change is reversible using physical means. For example, salt dissolved in water can be recovered by allowing the water to evaporate. Melting: Melting is when solid converts into a liquid after heating. Example of melting is turning of ice into water.
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Mayank answered this
1234
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Vruddhi Jain answered this
Physical and Chemical Changes
- Changes in energy are always accompanied by a particular chemical or physical change.
Physical Changes
- The changes in which no new substance is formed are called physical changes.
- The molecular composition remains totally same.
- For example, the molecular composition of ice and water is not changed.
- The energy needed to bring a physical change is equal to the amount of energy required to reverse the change. There is no change in energy.
- The changes are reversible and temporary. The reaction gets reversed if the cause producing the change is removed. For example, water on freezing forms ice and ice on melting forms water.
- Examples of physical change
- Dissolution of sugar in water
- Melting of ice
- Freezing of water
- Boiling of water
- Melting of wax
Chemical Changes
- The change in which the molecular composition is completely changed and a new product is formed is called a chemical change. A new product is formed.
- The changes in Chemical change are irreversible and permanent. A chemical change cannot be reversed by changing or altering the experimental changes.
- During a chemical change the energy changes occur. There is an energy difference in the breaking of old bonds in reactants and formation of new bonds in products.
- Examples of Chemical Change
- Burning of wood or paper
- Burning of camphor
- Souring of milk
- Burning of candle
- Digestion of food
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Pkp answered this
Physical changes?that involve a?change?of state are all?reversible. Other?changes?of state include vaporization (liquid to gas),freezing (liquid to solid), and condensation (gas to liquid).
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Hetav Kamalesh Rao answered this
Dear student,
Here is your answer:
Physical changes is a type of change in which the shape, size or form or a object with no chemicals added or removed.
Reversible change is a type of change where things or process of a object can be reversed.
Your Answer: Most things are reversible because of no real reason just the types of processes can be reversed. The two examples you asked for = 1. Water cycle ( water is changed in vapore and liquid but no chemical change os it is physical and also it returns from where it started so it is reversible too ) 2. Revolution of Earth (NO chemical change occurs so it is physical change and it moves in a orbit so from where it start there it ends so it is reversible too)
Hope your doubt is clear now :)
~ Hetav Rao
Here is your answer:
Physical changes is a type of change in which the shape, size or form or a object with no chemicals added or removed.
Reversible change is a type of change where things or process of a object can be reversed.
Your Answer: Most things are reversible because of no real reason just the types of processes can be reversed. The two examples you asked for = 1. Water cycle ( water is changed in vapore and liquid but no chemical change os it is physical and also it returns from where it started so it is reversible too ) 2. Revolution of Earth (NO chemical change occurs so it is physical change and it moves in a orbit so from where it start there it ends so it is reversible too)
Hope your doubt is clear now :)
~ Hetav Rao
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Jyotsana Shree answered this
Dear student,
Here is your answer:
Physical changes is a type of change in which the shape, size or form or a object with no chemicals added or removed.
Reversible change is a type of change where things or process of a object can be reversed.
Your Answer: Most things are reversible because of no real reason just the types of processes can be reversed. The two examples you asked for = 1. Water cycle ( water is changed in vapore?and liquid but no chemical change os it is physical and also it returns from where it started so it is reversible too ) 2. Revolution of Earth (NO chemical change occurs so it is physical change and it moves in a orbit so from where it start there it ends so it is reversible too)
Here is your answer:
Physical changes is a type of change in which the shape, size or form or a object with no chemicals added or removed.
Reversible change is a type of change where things or process of a object can be reversed.
Your Answer: Most things are reversible because of no real reason just the types of processes can be reversed. The two examples you asked for = 1. Water cycle ( water is changed in vapore?and liquid but no chemical change os it is physical and also it returns from where it started so it is reversible too ) 2. Revolution of Earth (NO chemical change occurs so it is physical change and it moves in a orbit so from where it start there it ends so it is reversible too)
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