Mostly changes around us are------.
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Answered by
4
Hey mate
The answer
1. Many changes are taking place around us on their own.
2. We can bring about a change in a substance by doing one or more of the following.
Heating.
Applying force
Mixing it with something else.
3. Changes caused by heating: When an object is heated, it gets affected in one or many possible ways.
Some objects get hot but do not change in any other way.
Some objects get hot and also expand in size.
Some objects get hot and begin to burn.
Some objects get hot and change their state.
4. Changes by applying pressure : When we apply force to an object,
We can change its shape and size.
Air can be compressed.
Metals can be hammered into thin sheets.
Elastic can be stretched.
Cotton can be spun into thin threads.
5. Changes by mixing a substance with other: We can bring about a change in a substance by mixing it with another, e.g.,Making solution by mixing water soluble substances in water.
6. Expansion: Metals expand on heating and contract on cooling.
7. Chemical changes:These are the changes in which chemical properties of a substance changes, and a new substance is formed. For example: cooking of food.
8. Physical changes:These are the changes in which only physical property of a substance changes and no new substance is formed.
9. Characteristic of physical changes :
No new substances are formed.
Products are identical to the reactant.
These changes are reversible.
10. Characteristics of chemical changes :
Properties of products are different from the properties of reactants.
Most of the chemical changes are irreversible.
These changes always result in energy changes
11 REVERSIBLE CHANGES.
12.IRREVERSIBLE CHANGES.
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The answer
1. Many changes are taking place around us on their own.
2. We can bring about a change in a substance by doing one or more of the following.
Heating.
Applying force
Mixing it with something else.
3. Changes caused by heating: When an object is heated, it gets affected in one or many possible ways.
Some objects get hot but do not change in any other way.
Some objects get hot and also expand in size.
Some objects get hot and begin to burn.
Some objects get hot and change their state.
4. Changes by applying pressure : When we apply force to an object,
We can change its shape and size.
Air can be compressed.
Metals can be hammered into thin sheets.
Elastic can be stretched.
Cotton can be spun into thin threads.
5. Changes by mixing a substance with other: We can bring about a change in a substance by mixing it with another, e.g.,Making solution by mixing water soluble substances in water.
6. Expansion: Metals expand on heating and contract on cooling.
7. Chemical changes:These are the changes in which chemical properties of a substance changes, and a new substance is formed. For example: cooking of food.
8. Physical changes:These are the changes in which only physical property of a substance changes and no new substance is formed.
9. Characteristic of physical changes :
No new substances are formed.
Products are identical to the reactant.
These changes are reversible.
10. Characteristics of chemical changes :
Properties of products are different from the properties of reactants.
Most of the chemical changes are irreversible.
These changes always result in energy changes
11 REVERSIBLE CHANGES.
12.IRREVERSIBLE CHANGES.
HOPE IT HELPS YOU ☺️
MAKE SURE TO MARK IT AS BRAINLIEST ANSWER...
Answered by
0
Answer:
Reverseble or irreversable
Explanation:
If a substance is reversable it can Be back to its normal form. For example, Dough to chapati (not yet heated. only the shape) and uncooked chapati to dough.
If a substance is irreversable it cannot be back to its normal form, for example, Dough to cooked chapati cannot change to the same dough at first.
This answer is according to class 6 Ncert books changes around us. please give me feedback if wrong.
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