A change where no new substances are formed is called a change and a change where a new substance is formed is called a change.

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A change where no new substances are formed is called a physical change and a change where a new substance is formed is called a chemical change.
Physical change is a change where no new substances are formed. These changes alter the physical properties of the substance only. They may or may not be reversible. For example, melting of ice cream and cutting of paper are physical changes. A chemical change is a change where a new substance is formed as the chemical properties of the original substance are altered. These are irreversible changes. For example, the burning of wood and curdling of milk are chemical changes.

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