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Which among the following is an example of a Chemical Change?
- a)Heating of iron rod
- b)Melting of wax
- c)Rusting of iron
- d)Woollen yarn to knitted sweater
Correct answer is option 'C'. Can you explain this answer?
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Which among the following is an example of a Chemical Change?a)Heating...
Rusting of iron is a chemical change because it happens due to a chemical reaction between iron and air in presence of moisture.
Rusting of iron is an example of a chemical change because it involves a chemical reaction between iron, oxygen, and moisture to form a new substance, iron oxide (rust). This process changes the chemical composition of the iron, and the change is irreversible under normal conditions.
In contrast:
- Heating of an iron rod (1) is a physical change as it only increases the temperature of the iron without changing its chemical structure.
- Melting of wax (2) is also a physical change as it changes the state of the wax from solid to liquid without altering its chemical composition.
- Woollen yarn to knitted sweater (4) is a physical change as it involves changing the shape and form of the yarn without changing its chemical properties.
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Which among the following is an example of a Chemical Change?a)Heating of iron rodb)Melting of waxc)Rusting of irond)Woollen yarn to knitted sweaterCorrect answer is option 'C'. Can you explain this answer?
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