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Why is it sometimes difficult to decide whether an observed change is physical or chemical?


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2014-10-06 20:20:00
2014-10-06 20:20:00

It is sometimes difficult to decide whether an observed change is physical or chemical because of its expression. Some reactions create subtle changes and some may appear to be physical or chemical until, upon closer observation externally or internally, it is actually turns out to be the opposite.

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If the property can be observed without changing the chemical composition of the substance, then it is a physical property. If the property can be observed only through a chemical reaction, then it is a chemical property.

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A chemical property can only be observed by changing the chemical composition of the substance, while a physical property can be observed without a change in chemical composition.

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A physical property can be observed without changing the chemical composition of the substance. A chemical property can only be observed through a chemical reaction, which does change the chemical composition of the substance.

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Physical changes are those that can be observed.

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Physical properties can be observed without changing the chemical composition of a substance. Chemical properties can only be observed by changing the chemical composition of the substance. In a physical change, the chemical composition of the substance does not change. In a chemical change, the chemical composition of the substance changes.


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