H2O became a vapor when heated because thats the only one that can go back to its normal state, which is what a physical change is.
<h2>Answer : Option D) Heterogeneous mixture</h2><h3>Explanation : </h3>
A mixture in which particles are not evenly distributed and particles keep their unique properties are called as heterogeneous mixture.
Usually, in heterogeneous mixture the substances are not evenly distributed and they can be easily separated through any physical methods. Also the components retains their original/unique properties in the mixture. It usually contains various particles from different substances that are not uniformly distributed throughout the mixture.
Answer:
It emits energy since to move from a higher energy level to a lower energy level or ground state, it must lose energy.
