Question

State three reasons why you think air is a mixture and water is a compound?

Answer 1

Hint: A chemical compound is a material made up of numerous similar molecules (or molecular entities) that are bound together by chemical bonds and contain atoms from many elements. As a result, a molecule made up of only one element's atoms is not a compound. Compounds are classified into four kinds based on how the component atoms are kept together.

Complete Step By Step Answer:
Elements are made up of just the same type of atoms. They can be metal or nonmetal, but they must only contain atoms of the same kind. For example, hydrogen and oxygen are both gases. They're primarily made up of electrons that have been shared.
Compounds are substances formed by mixing atoms or molecules of several kinds in a predetermined proportion. Every time and in every place, they are the same. Regardless of time, temperature, pressure, location, or height, the ratio in which the various atoms or molecules are combined remains constant.
For example, HCl is a compound made up of two distinct atoms, a hydrogen atom and a chlorine atom, which are combined in the same proportion. Everywhere and at all times, the composition remains unchanged.
Mixtures are substances in which different types of atoms, molecules, elements, and compounds are combined in an unfixed ratio. It may differ from location to place or over time. We can't investigate a mixture's real composition. For example, when we create lemonade by combining salt, sugar, and lime with water, the resulting lemonade is a mixture since it includes different components in varying ratios.
To conclude
Air
1. Because it includes two or more pure components, air is a mixture.
2. It may be split into a simpler material via physical methods.
3. Its composition isn't set in stone.
Water
1. Water is a compound because it has a fixed and indivisible composition.
2. It has a well-defined formula and is present in a bulk proportion.

Note:
The condition of matter has no bearing on the character of a compound or combination. If we alter the condition of water from solid to liquid or gas, we cannot argue that it converts from compound to mixture. Also, if we add anything to water, the resultant solution will undoubtedly be a combination, but water will always be a compound on its own.