Question 55

Sand is a mixture.

Sand is classified as a mixture because it is composed of various rock and mineral particles that are not chemically bonded together. This characteristic allows sand to contain different components that retain their individual properties.

A) Isotope

Isotopes refer to variations of a chemical element that have the same number of protons but different numbers of neutrons. Sand does not fit this definition, as it is not a single element, but rather a combination of various minerals and rocks.

B) Compound

A compound is a substance formed when two or more elements are chemically bonded together in fixed proportions. Sand does not qualify as a compound since it consists of a mixture of different unbonded particles, rather than a single chemical entity.

C) Element

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Sand is not an element because it is made up of multiple particles from different minerals and rocks, which means it cannot be classified as a pure substance.

D) Mixture

A mixture consists of two or more substances that are physically combined but not chemically bonded. Sand fits this definition perfectly, as it is made up of various rock and mineral particles that retain their distinct properties and can be separated by physical means.

Conclusion

The correct classification of sand as a mixture highlights its nature of containing various unbonded particles. In contrast, the other options fail to apply, as they describe substances that require specific bonding or elemental purity that sand does not possess. Thus, understanding the composition of sand reinforces its definition as a mixture.