A suitable example to support the statement that not all physical changes can be reversed is the process of burning paper. When paper is burned, it undergoes a chemical reaction known as combustion. During combustion, the paper reacts with oxygen in the air and undergoes irreversible chemical changes. The paper is transformed into ash, smoke, and gases.
Once the paper has been completely burned, it is not possible to reverse the chemical changes and restore the paper to its original form. The ash and smoke produced cannot be converted back into the original paper through any physical means. This is because the combustion process involves breaking and forming chemical bonds, resulting in the formation of new substances with different properties.
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Certainly! A suitable example of a physical change that cannot be easily reversed is the process of burning or combustion. When a substance undergoes combustion, it chemically reacts with oxygen in the air, resulting in the release of heat, light, and often the formation of new substances. Once combustion occurs, it is challenging or impossible to reverse the chemical reactions and restore the original substances.
For instance, consider the burning of paper. When paper burns, it reacts with oxygen, and the cellulose fibers in the paper break down into carbon dioxide, water vapor, and ash. Once the paper has been completely burned, it cannot be restored to its original form. The process of combustion is irreversible, and the paper is transformed into new substances that cannot be reversed through simple physical means.
Therefore, the example of burning paper demonstrates that certain physical changes, such as combustion, cannot be easily reversed.
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Answer:
A suitable example to support the statement that not all physical changes can be reversed is the process of burning paper. When paper is burned, it undergoes a chemical reaction known as combustion. During combustion, the paper reacts with oxygen in the air and undergoes irreversible chemical changes. The paper is transformed into ash, smoke, and gases.
Once the paper has been completely burned, it is not possible to reverse the chemical changes and restore the paper to its original form. The ash and smoke produced cannot be converted back into the original paper through any physical means. This is because the combustion process involves breaking and forming chemical bonds, resulting in the formation of new substances with different properties.
For instance, consider the burning of paper. When paper burns, it reacts with oxygen, and the cellulose fibers in the paper break down into carbon dioxide, water vapor, and ash. Once the paper has been completely burned, it cannot be restored to its original form. The process of combustion is irreversible, and the paper is transformed into new substances that cannot be reversed through simple physical means.
Therefore, the example of burning paper demonstrates that certain physical changes, such as combustion, cannot be easily reversed.
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