Class 9 Exam > Class 9 Questions > Which of the following is a physical change?a...
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Which of the following is a physical change?
- a)Burning of a Natural Gas
- b)Rusting of iron
- c)Freezing of water
- d)Digestion of food
Correct answer is option 'C'. Can you explain this answer?
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Which of the following is a physical change?a)Burning of a Natural Gas...
Physical Change: Freezing of Water
Physical changes are those changes in which the substance undergoes changes in its physical properties like size, shape, state, or color, but its chemical composition remains the same. The freezing of water is a physical change because it only involves a change in the state of matter of water from liquid to solid without any change in its chemical composition.
Explanation:
When water is cooled below zero degree Celsius, it starts losing its heat energy, and the molecules of water start slowing down. As the temperature decreases, the kinetic energy of water molecules decreases and the intermolecular forces take over causing the water molecules to arrange themselves into a specific pattern, forming a crystalline structure, which results in the solidification of water.
The solid ice formed is still water, but the only difference is that its molecules are arranged in such a manner that they form a solid instead of a liquid. This is a reversible process, and the ice can be melted again by heating it above 0 degree Celsius, and it will turn into liquid water.
Conclusion:
Hence, the freezing of water is a physical change as there is no change in the chemical composition of water, and the only change that occurs is a change in the state of matter of water from liquid to solid.
Physical changes are those changes in which the substance undergoes changes in its physical properties like size, shape, state, or color, but its chemical composition remains the same. The freezing of water is a physical change because it only involves a change in the state of matter of water from liquid to solid without any change in its chemical composition.
Explanation:
When water is cooled below zero degree Celsius, it starts losing its heat energy, and the molecules of water start slowing down. As the temperature decreases, the kinetic energy of water molecules decreases and the intermolecular forces take over causing the water molecules to arrange themselves into a specific pattern, forming a crystalline structure, which results in the solidification of water.
The solid ice formed is still water, but the only difference is that its molecules are arranged in such a manner that they form a solid instead of a liquid. This is a reversible process, and the ice can be melted again by heating it above 0 degree Celsius, and it will turn into liquid water.
Conclusion:
Hence, the freezing of water is a physical change as there is no change in the chemical composition of water, and the only change that occurs is a change in the state of matter of water from liquid to solid.
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Community Answer
Which of the following is a physical change?a)Burning of a Natural Gas...
Answer is C because it burning of candle includes chemical reaction , rusting of iron also includes chemical reaction and digestion of food also includes chemical reaction while freezing of water does not include any chemical reaction
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Which of the following is a physical change?a)Burning of a Natural Gasb)Rusting of ironc)Freezing of waterd)Digestion of foodCorrect answer is option 'C'. Can you explain this answer?
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