Question

How and why do the changes occur?​

Answer 1

$\huge\mathbb{\fcolorbox{skyblue}{navy}{\blue{ANSWER}}}$

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

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.

Hope it's helpful to you

$\huge \color{red}♡♡♡♡♡♡♡♡♡♡♡$$\huge \color{red}♡♡♡♡♡♡♡♡♡♡♡$$\huge \color{red}♡♡♡♡♡♡♡♡♡♡♡$$\huge \color{red}♡♡♡♡♡♡♡♡♡♡♡$