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Question
Give an example of a chemical reaction for the following situation:
A gas is evolved
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Solution
Reaction between sodium hydrogen carbonate and acetic acid – carbon dioxide gas is evolved.
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If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Give two other examples of a similar type of change.
Take three glass bottles with wide mouths. Label them A, B, and C. Fill about half of the bottle A with ordinary tap water. Fill bottle B with water which has been boiled for several minutes, to the same level as in A. In bottle C, take the same boiled water and of the same amount as in other bottles. In each bottle put a few similar iron nails so that they are completely under water. Add a teaspoonful of cooking oil to the water in bottle C so that it forms a film on its surface. Put the bottles away for a few days. Take out nails from each bottle and observe them. Explain your observations.
