Which of the following materials could be a pure substance?
Butter, ghee, water, ink, glass, paper, sugar, banana, orange, marble, blood, wood.
Water and sugar is fully pure substance.
Are the naturally occurring materials in nature chemically pure substances? Explain.
Most of the naturally occurring material in nature are not chemically pure substances. They are purified by chemical or physical process. For example the minerals are available mixed with other material or at least mixed will dust particles.
How would you test the purity of a given substance?
A pure substance or chemical substance is a material that has constant composition and has consistent properties throughout the sample. it has a fixed melting point or boiling point at constant pressure. For example, pure water boils at 373K at 1 atmospheric pressure. But water containing some invisible dissolved substance boils at a temperature above 373K.
A pure substance is a material that has constant composition and has consistent properties throughout the sample. A fruit or a vegetable does not always have the same colour, taste or texture due to the presence of various constituents in different proportions.
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