Question

Four other permanent chang
es

Answer 1

Answer:

examples of permanent changes are- rusting of iron, burning of paper,cooking of food, digestion of food,fermentation.

Explanation:

the changes in which entirely new substances are formed and cannot be reversed are called chemical change or permanent change.

Here , in the example like burning of paper. when we burn the paper smoke , ashes , Co2 and other gases are formed which have entirely different properties and cannot be reversed back to form the paper that we have burnt

I hope that it will help you......