Melting is a physical change. Steel melts when heated and changes back to solid form when it cools. Here, no new substance is formed.
The other changes - rusting, burning of magnesium ribbon, and turning of lime water milky by carbon dioxide, are chemical changes because the change results in the production of new substances.
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Similar Questions
Q1
In an experiment to check the amount of carbon dioxide, atmospheric air and exhaled air is passed through lime water. Which of the following turns lime water milky?
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Q2
Statement 1- Lime water turns milky when air is passed through the solution.
Statement 2- Air contains carbon dioxide which turns lime water milky.
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Q3
Why lime water turns milky due to formation of white precipitate of calcium carbonate , when carbon dioxide gas is passed through lime water ?
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Q4
When carbon dioxide gas is passed through lime water, lime water becomes milky. This is an example of: