Explosion of firework is a chemical change and produces heat, light, sound and unpleasant gases that pollute the atmosphere, so it is advised not to play with fireworks.
Question
Why you are advised not to play with fireworks?
- Physical and chemical changes CBSE Class 7
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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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