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What Is An Irreversible Change?
An irreversible change is when something cannot be changed back to its original form. In many irreversible changes, new materials and substances are formed.
What Is An Example Of An Irreversible Change?
Burning - Once something is burnt, it can't be reverted back to its original form. It can't become unburnt. Once a piece of paper has been burnt, it can't be used to write or read anymore.
Cooking - Cooking changes the chemical composition of a substance. Once eggs or meat become cooked, it will never be raw again. Once a cake is baked it won't ever become milk and flour again.
Rusting - Once Iron is rusted, it cannot become unrusted. The rusted part can be sanded off and the underside can be re-shined, but if this continues, the iron will eventually thin out.
Mixing - Mixing some substances together can cause an irreversible change to create a new substance. For example, cement, or vinegar and bicarbonate of soda to create carbon dioxide.
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