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Irversible changes are tempary changes that can be undone .They are also called physical changes eg=melting of ice

Irreversible changes are Permanent changes that cannot be undone .This is also eg of irreversible changes=smoke comeing from the factory

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Definition and examples of reversible and irreversible changes, expansion and contraction of matter and physical and chemical changes. 

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Definition and examples of reversible and irreversible changes, expansion and contraction of matter and physical and chemical changes. 

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Reversible: Changes that can be bought back to its original form.
Irreversible: Changes that can't be bought back to its original form.
Example: Reversible - Melting of ice          irreversible: Baking a cake

Expansion: When a matter gets heated the inter molecular spaces increases which causes the matter to expand.
Contraction: When a matter gets cooled the inter molecular spaces decreases which causes the matter to contract.
Example: Expansion - when we heat the lid of jam jar. Contraction - when mercury gets cooled, it will contract

Physical change: A Changes in which no new substance are formed.
Chemical change: A Change in which new substance are formed.
Example: Physical change - A broken glass. Chemical change - A rotten apple [when exposed to air].

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Definition and examples of reversible and irreversible change

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Definition and examples of reversible and irreversible change

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Reversible: Changes that can be changed back to its original form.
Irreversible: Changes that can't be changed back to its original form.
Example:
Reversible: Melting chocolate can be changed back if it is kept in the refrigerator. It is a reversible change.
•  Salt dissolved in water can be changed back with a process. It is a reversible change.
Irreversible: Tearing a paper can't be brought to its original form. It is a irreversible change.
•  Chopped wood can't be brought to its original form. It is an irreversible a change.
I learned the definition and examples of reversible and irreversible change.

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I have learnt that:-
Expansion:-when a object is heated the intermolecular space increases and the methods are called. solid-liquid=melting, liquid-gas=evaporation.
Contraction:-when a object is cooled the intermolecular space decreases and the methods are called. gas-liquid=condensation, liquid-solid=freezing.

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I have learnt expansion,contraction,reversible and irreversible change
Expansion :-wham a matter expands .eg:when milk gets heated for a long time,the milk would overflow because of expansion.
Contraction:-when a matter contracts.eg:when water evaporates the water gets reduced,cotraction.
Reversible change :-a change that can come back to the previous form.eg:sugar dissolved in water,sugar can be taken back by boiling.
Irreversible change :-a change the cannot be changed to previous form. eg:when a paper is torn it won't come back to its previous form.

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Definition and example of reversible and irreversible

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Definition and example of reversible and irreversible

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Reversible: Changes that can be changed back.
Irreversible: Changes that can't be changed back.
Example:
Reversible: An melted chocolate can be changed back if it is kept in the refrigerator. It is an reversible change.
•  If salt dissolves in the water with a process you can take the salt from the water. It is an irreversible change.
Irreversible: If you tear a paper then you can't bring it to its same form. It is an irreversible change.
•  Chopped wood can't be brought to its original form. It is an irreversible change.
I have learned what is reversible and irreversible change and the examples of it.

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I have learnt that reversible change means once a state of matter has changed we can reverse it back to its original form, but this is not possible in irreversible change. Example: ice melts from solid to liquid and we can freeze water to ice again - this is reversible change. Cutting trees is irreversible change.

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I learned about expansion,contraction,reversible and ireversible changes.

Expansion means the intermolecular spaces increasing.
Example:The water heating{not boil}.
Contraction means the intermolecular spaces decreases.
Example:Keeping a balloon   in the freezer
Reversible is a change that can change back into it's orignal form
EG-Melting of chocolate
Irreversible means which cannot be changed into its orignal form.
EG-Nail rusting

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I learned about expansion, contraction, reversible and irreversible changes.
Nail rusting, toasting bread are irreversible changes.
melting chocolate and boiling are reversible changes.
When we keep a balloon in a room temperature and another balloon in the fridge, the balloon which is in the room temperature it will be the same size and the balloon which is in the fridge it contracts.
when we heat water and pour the water in another glass it spills that's because intermolecular space is expanding and the water spills.

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I have learned about reversible and irreversible
Reversible change means a change that can be reversed to its original form
Irreversible change means a change that can't be reversed to its original form

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I learnt about reversible changes...changes that can be put back to its original form and about irreversible​ changes...Changes that cannot be undone

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{CRISTIAN0} I have learned that a reversible change is possible to change back to its original form for example 

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{CRISTIAN0} I have learned that a reversible change is possible to change back to its original form for example 

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when we melt ice or chocolate and we freeze it it will change back to its original form
An in-reversible change is when you cant turn an object to its original form,For example

breaking off an egg when you break an egg the egg shell cracks,So if you try to join it together the crack marks will still be there

BIOTIC ANDABIOTIC
BIOTIC factors are the factors with cells and the word BIOTIC means
living organisms for examples plants and humans they are biotic  creatures
ABIOTC means non living things for example rocks,books,pencil,board,bottle,wood,iron and glass are all ABIOTIC

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I have learned that reversible change can be brought
E.g. When we melt ice we get water and when we freeze the water we get the ice back.
Irreversible change scan not be reversed or brought back to its original size.
Eg: When we tear tihe paper we can not get the paper back to its original form.
Biotic factor are living things. Eg: humans,animals,trees.
Abiotic factors are non-living things. Eg: sofa,bag,football.
Biotic factors depend on Abiotic factors.

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I learned about biotic and abiotic factors
Biotic is living and abiotic is non living.
I learned revisible and irreversible.
Revisible can be bought back and irreversible cannot be brought back.
I know when we put something in common.
we put something in common when it has living and nonliving things

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I learned about reversible and irreversible changes
EX:A chocolate it is reversible change because if you freeze it will return to its form.
EX:A cake is mixed up with flour,eggs etc,but when you mix it you can not get the ingredients back.

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Reversible changes are temporary changes that can be undone .They are also called physical changes.
Eg:melting of ice

Irreversible changes are Permanent,changes that cannot be undone.
Eg:Baking of cake

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Naveen-A reversible change or also known as physical change is a change of things that can be made back into its own form.Actually,the form does not change but the look changes.An irreversible change is a change where the material changes.It is known as a chemical change.

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Naveen-A reversible change or also known as physical change is a change of things that can be made back into its own form.Actually,the form does not change but the look changes.An irreversible change is a change where the material changes.It is known as a chemical change.

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Expansion is when the particles inside an object spread more apart and soon might change its form.Contraction is when particles come closer and intermolecular spaces decrease in an object and it soon cools and might also change form soonExample-reversible-when butter melts it can be cooled and made back to its normal form.Irrevers7ble-As living things grow,they cannot be smaller again.They only grow bigger until death.Expansion-Boiling water.Contraction-Freezing air inside an object.