Answer:
Mixtures are not chemically united.
Sand is a mixture.
Step-by-step explanation:
Mixture is a substance which has two or more components which do not combine chemically and do not have any fixed ratio in which they are present.
- They can be separated by the help of physical means.
- Chemically inactive that is they are not united by chemical interactions.
Sand is made up of rocks which are different from each other along with different chemical composition which indicates that they are very much different from one another.
Rocks present in larger size can easily be separated from the smaller rock pieces present in sand without trouble.