Question

why do changes occur​

Answer 1

Answer:

Sometimes these changes are spontaneous while sometimes these changes are introduced. Physical changes are the changes only in the physical properties of a substance is often reversible. Chemical changes bring about a change in the chemical composition of a substance and in most cases are irreversible.

Answer 2

Answer:

Physical changes are the changes only in the physical properties of a substance is often reversible. Chemical changes bring about a change in the chemical composition of a substance and in most cases are irreversible. An example of a physical change is the change in the state of water from ice to liquid water to steam.

Explanation:

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