mention five permanent change
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A chemical change is permanent. A new substance is formed and it's generally irreversible.
Some examples of a permanent changes are burning of paper, burning of fuel, rusting of iron, the souring of milk, growth in a living being, cooking, digestion of food, burning of wood, etc.
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burning of coal
temperature
if a tree is grown it can't change back into a baby plant.
ice change into water
freezing of water
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