The following changes accompany the formation of new substances: change in state, colour, temperature, odour, sound may be produced or gas may evolve.
Question
When chemical reaction takes place, what changes accompany the formation of new substances?
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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. a. Do you think rust is different from iron? b. Can you change rust back into iron by some simple methods? c. Do you think formation of rust from iron is a chemical change? d. Give two other examples of a similar type of change.
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