Question

Boiling and evaporation
Give reasons for the following.
Bursting of crackers is an
exothermic change.
Boiling is a physical change.
All chemical changes are permanent
Rusting of iron is a chemical change​

Answer 1

Answer:

HEY HERE IS YOUR ANSWER ❤️❤️

1. Bursting of crackers is an exothermic change because in bursting of crackers there is too much carbon dioxide relase which causes green house effect and we know that in green house effect the temperature of our earth goes on increasing.Hence ,we say that bursting of crackers is a exothermic change.
2. Boiling is a physical change because boiled water is reversed into liquid water by the process of condense station
3. All chemical Changes are permanent because in this nature or properties of an atom or elements is totally changed.
4. Rusting of iron is a chemical change because in this iron metal is covered with reddish brown coating which have different properties from iron.

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