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(i) A substance that has a fixed chemical composition throughout is called a pure substance such as water, air, and nitrogen. A pure substance does not have to be of a single element or compound.
(ii) • Pure substances are mostly homogeneous in nature containing only one type of atoms or molecules.
• These substances mainly have a constant or uniform composition throughout.
• The substances have fixed boiling and melting points.
• A pure substance usually participates in a chemical reaction to form predictable products.
(iii) :- Appearance - A pure substance is usually all one color. The exception is if the matter has unusual optical properties, such that it reflects or refracts light. A pure substance has the same appearance and properties, no matter where you sample it. If you magnify the matter, it should appear the same everywhere in its composition..
:- Melting point - Time-lapse video of ice melting. Melting point, temperature at which the solid and liquid forms of a pure substance can exist in equilibrium. As heat is applied to a solid, its temperature will increase until the melting point is reached. More heat then will convert the solid into a liquid with no temperature change.....
:- Boiling point - The boiling point of a pure substance is the temperature at which the substance transitions from a liquid to the gaseous phase. At this point, the vapor pressure of the liquid is equal to the applied pressure on the liquid. The boiling point at a pressure of 1 atmosphere is called the normal boiling point......
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