mixture同compound有咩分別,同埋why air is mixture唔係compound(eng plx)

good ans.

A mixture in chemistry is the product of a mechanical blending or mixing of chemical substances like elements and compounds, without chemical bonding or other chemical change, so that each ingredient substance retains its own chemical properties and makeup . While there are no chemical changes in a mixture, physical properties of a mixture, such as its melting point, may differ from those of its components. Mixtures can usually be separated by mechanical means.


A chemical compound is a chemical substance consisting of two or more different chemically bonded chemical elements, with a fixed ratio determining the composition. The ratio of each element is usually expressed by chemical formula. For example, water (H2O) is a compound consisting of two hydrogen atoms bonded to an oxygen atom.

The atoms within a compound can be held together by a variety of interactions, ranging from covalent bonds to electrostatic forces in ionic bonds. A continuum of bond polarities exist between the purely covalent bond (as in H2) and ionic bonds. For example H2O is held together by polar covalent bonds. Sodium chloride is an example of an ionic compound.

air is the mixture of gases because the gases由二至多種純物質（單質或化合物）沒有經化學合成而混合成的物質.If you say that air is compound of gases mean that the gases是指從化學反應之中所產生，由兩種或兩種以上元素構成的純淨物so it's wrong

I don't how to translate a certain of part in chinese to english,you translate yourself,sorry
I hope you will choose my answer,thank you