science
Grade-5
Easy

Question

hintHint:

17. Burning
18. Curdling
19. Rusting
20. Food digestion

burning is the example of irreversible change.
Curdling is the example of chemical change, in which milk forms lumps.
Rusting is the process where iron changes its colour to reddish brown colour.
Digestion is the change where the substance goes into the stomach and breaks down into simpler substances.

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Lactic acid is the acid preaent in milk.
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chemical change is also calles chemic reaction.
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