Step-by-step explanation:
A mixture is defined as the substance formed by combination of two or more substances. These substances do not combine chemically with each other.
When particles of solute in a mixture are distributed in an even manner then it is known as a homogeneous mixture.
Whereas if particles of a solute in a mixture are present unevenly then it is known as a heterogeneous mixture.
Particles of substances mixed in mixtures can be separated out by various methods.
On the other hand, a compound is defined as a substance in which different atoms chemically combine together in a fixed ratio by mass.
For example,
is a compound.
Atoms of a compound can be separated by chemical methods only.
Thus, we can conclude that when the tap water found in many areas of the United States leaves white deposits when it evaporates. Then it means this tap water is a mixture.