Please decide if the following is a mixture, or pure substance. Describe it as a

Question

Please decide if the following is a mixture, or pure substance. Describe it as a homo- or heterogeneo sam ple and if possible, decide what pure substances are its constituents (i.e. mixture of two compounds, a) Transparent liquid evaporates and a white crust is left behind. The original liquid is b) Sample of material contains one kind of homoatomic molecule. us or mixture of two elements etc.). If the material is pure substance, decide if it is element or compound. c) Five grams of solid powder is thoroughly washed with water in such a way that no solid can escape (e.g. using a good strainer). When the insoluble residue is recovered and dried, it weighs only 2 grams. The original solid powder was: d) Sample of gas was shown to contain one kind of heteroatomic molecule and one kind of free atom.

Explanation / Answer

a) here the original liquid is a mixture because it is obtained by mixing of two or more components in any indefinite proportion

b)from the above it inticates that it is homogeneous mixture of different components

c) here after washing with water and dried the weight of solid residue is reduced it indicates it is a mixture of components

d)it indicates this mixture is made up of one kind of element and compound

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