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Chemical changes are
- a)Always irreversible
- b)Mostly reversible
- c)Always reversible
- d)Mostly irreversible
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Chemical changes area)Always irreversibleb)Mostly reversiblec)Always r...
Crystals of copper sulphate are prepared by the method of crystallization. It is an example of physical change.
So option D is correct answer.
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Chemical changes area)Always irreversibleb)Mostly reversiblec)Always r...
Chemical Changes
Chemical changes are processes that result in the formation of new substances with different properties than the original substances. These changes are always irreversible in nature.
Irreversible Nature
When a chemical change occurs, the bonds between atoms are broken and new bonds are formed to create new substances. This process is not easily reversible as it involves the rearrangement of atoms at the molecular level. Once the chemical reaction has taken place, it is difficult or impossible to revert back to the original substances.
Examples
Some common examples of irreversible chemical changes include burning of paper, rusting of iron, cooking an egg, and baking a cake. In each of these cases, new substances are formed that cannot be easily converted back to their original forms.
Reversible Changes
On the other hand, physical changes such as melting, freezing, boiling, or dissolving are mostly reversible as they do not involve the formation of new substances. These changes can be reversed by simply changing the conditions such as temperature or pressure.
In conclusion, chemical changes are always irreversible due to the formation of new substances with different properties. It is important to distinguish between chemical changes and physical changes to understand the nature of the process and its reversibility.
Chemical changes are processes that result in the formation of new substances with different properties than the original substances. These changes are always irreversible in nature.
Irreversible Nature
When a chemical change occurs, the bonds between atoms are broken and new bonds are formed to create new substances. This process is not easily reversible as it involves the rearrangement of atoms at the molecular level. Once the chemical reaction has taken place, it is difficult or impossible to revert back to the original substances.
Examples
Some common examples of irreversible chemical changes include burning of paper, rusting of iron, cooking an egg, and baking a cake. In each of these cases, new substances are formed that cannot be easily converted back to their original forms.
Reversible Changes
On the other hand, physical changes such as melting, freezing, boiling, or dissolving are mostly reversible as they do not involve the formation of new substances. These changes can be reversed by simply changing the conditions such as temperature or pressure.
In conclusion, chemical changes are always irreversible due to the formation of new substances with different properties. It is important to distinguish between chemical changes and physical changes to understand the nature of the process and its reversibility.
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Chemical changes area)Always irreversibleb)Mostly reversiblec)Always r...
Chemical changes are always irreversible because for example we cant convert butter to milk.
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Chemical changes area)Always irreversibleb)Mostly reversiblec)Always reversibled)Mostly irreversibleCorrect answer is option 'A'. Can you explain this answer? for Class 7 2025 is part of Class 7 preparation. The Question and answers have been prepared according to the Class 7 exam syllabus. Information about Chemical changes area)Always irreversibleb)Mostly reversiblec)Always reversibled)Mostly irreversibleCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 7 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Chemical changes area)Always irreversibleb)Mostly reversiblec)Always reversibled)Mostly irreversibleCorrect answer is option 'A'. Can you explain this answer?.
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