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Question

Doesactionof heat on sodium nitrate is a physical change or a chemical change or both

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Solution

The following reactions takes place on heating of sodium nitrate.
2NaNO3 2NaNO2 + O2
​The starting material NaNO3 is white solid but the product formed NaNO2 is ​white to slightly yellowish crystalline powder. So, although the both the starting and products are solid but their is change of colour. That is a physical change. More over new products are formed after the reaction which is different from the starting material. That is a chemical change.
Hence heating of NaNO3 shows physical as well as chemical change.

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