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Chemical Change

Is aging of h...

Question

Is aging of human beings is chemical or physical change

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Solution

Aging of human beings is a combination of both physical and chemical change.
It is a physical change because our physical dimensions like height, weight changes over time.
It is a chemical change because the concentration of various elements like protein, carbohydrates, fat etc changes over time.

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Any undesirable change in the physical, chemical or biological characteristics of air, land and water that affect human life adversely is called__.

Q. Matter undergoes a change. The changes are of two types: Physical and chemical change.

A physical change is a change that involves only a change in the physical state of matter. Its chemical properties remain the same. Usually increasing the temperature or applying pressure or both bring about a physical change. On reversing the condition, that is reducing the temperature or reducing the pressure or both, the original state of matter is restored. In other words, physical changes are reversible.

A chemical change is a change that involves a change in the chemical composition of matter. A new substance is formed. In a chemical change, new chemical and physical properties of the substance are formed. In a chemical change, the chemical and physical properties of the substance formed will be different from the original substance.

In a chemical change, the properties that change are :

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