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Which of the following is an example of a physical change?
- a)Rusting of iron
- b)Burning of wood
- c)Cooking an egg
- d)Dissolving sugar in water
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
Which of the following is an example of a physical change?a) Rusting o...
Understanding Physical Changes
Physical changes refer to transformations that do not alter the chemical composition of a substance. In simpler terms, the material remains the same at the molecular level, even though its form or appearance may change.
Examples of Physical Changes
- Dissolving Sugar in Water:
- This is a classic example of a physical change.
- When sugar is added to water, it dissolves, forming a homogeneous mixture.
- The sugar molecules disperse among the water molecules, but the chemical structure of the sugar remains unchanged.
- If the water is evaporated, the sugar can be recovered in its original form.
Comparison with Other Options
- Rusting of Iron:
- This is a chemical change.
- Iron reacts with oxygen and moisture to form iron oxide (rust), altering its properties.
- Burning of Wood:
- Another chemical change.
- Wood combusts, creating ash, carbon dioxide, and other products, which are different substances from the original wood.
- Cooking an Egg:
- This is also a chemical change.
- The proteins in the egg undergo denaturation and coagulation, resulting in irreversible changes.
Conclusion
In summary, dissolving sugar in water is a reversible physical change, while rusting, burning, and cooking involve chemical reactions that permanently alter the substances involved. Recognizing these differences is essential for understanding the nature of materials around us.
Physical changes refer to transformations that do not alter the chemical composition of a substance. In simpler terms, the material remains the same at the molecular level, even though its form or appearance may change.
Examples of Physical Changes
- Dissolving Sugar in Water:
- This is a classic example of a physical change.
- When sugar is added to water, it dissolves, forming a homogeneous mixture.
- The sugar molecules disperse among the water molecules, but the chemical structure of the sugar remains unchanged.
- If the water is evaporated, the sugar can be recovered in its original form.
Comparison with Other Options
- Rusting of Iron:
- This is a chemical change.
- Iron reacts with oxygen and moisture to form iron oxide (rust), altering its properties.
- Burning of Wood:
- Another chemical change.
- Wood combusts, creating ash, carbon dioxide, and other products, which are different substances from the original wood.
- Cooking an Egg:
- This is also a chemical change.
- The proteins in the egg undergo denaturation and coagulation, resulting in irreversible changes.
Conclusion
In summary, dissolving sugar in water is a reversible physical change, while rusting, burning, and cooking involve chemical reactions that permanently alter the substances involved. Recognizing these differences is essential for understanding the nature of materials around us.
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Which of the following is an example of a physical change?a) Rusting o...
Dissolving sugar in water is an example of a physical change because the sugar can be recovered by evaporating the water, and no new substances are formed. In contrast, burning wood and cooking an egg involve chemical changes.
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Which of the following is an example of a physical change?a) Rusting of ironb) Burning of woodc) Cooking an eggd) Dissolving sugar in waterCorrect answer is option 'D'. Can you explain this answer? for Class 8 2026 is part of Class 8 preparation. The Question and answers have been prepared according to the Class 8 exam syllabus. Information about Which of the following is an example of a physical change?a) Rusting of ironb) Burning of woodc) Cooking an eggd) Dissolving sugar in waterCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 8 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following is an example of a physical change?a) Rusting of ironb) Burning of woodc) Cooking an eggd) Dissolving sugar in waterCorrect answer is option 'D'. Can you explain this answer?.
Which of the following is an example of a physical change?a) Rusting of ironb) Burning of woodc) Cooking an eggd) Dissolving sugar in waterCorrect answer is option 'D'. Can you explain this answer? for Class 8 2026 is part of Class 8 preparation. The Question and answers have been prepared according to the Class 8 exam syllabus. Information about Which of the following is an example of a physical change?a) Rusting of ironb) Burning of woodc) Cooking an eggd) Dissolving sugar in waterCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 8 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following is an example of a physical change?a) Rusting of ironb) Burning of woodc) Cooking an eggd) Dissolving sugar in waterCorrect answer is option 'D'. Can you explain this answer?.
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