1/8/2024 0 Comments Pure substance definitionchemical substance - material produced by or used in a reaction involving changes in atoms or molecules chemical explosive - a chemical substance. A pure substance is one which is made up of only one kind of molecules.It has definite composition and properties.All elements and compounds are pure substances.Some examples are oxygen,hydrogen,gold,silver,copper,common,salt,pure water ,alum.An impure substance is one which is a mixture of two or more kinds of. When we say something is pure, we mean that only one substance is present in the material, and. But, there are exceptions to this definition a pure substance can also be defined as a form of matter that has both definite. According to this definition a chemical substance can either be a pure chemical element or a pure chemical compound. Specifying that the standard state is a specific temperature and pressure, would mean that the standard state is not even remotely realizable for many gases. Pure substance synonyms, Pure substance pronunciation, Pure substance translation, English dictionary definition of Pure substance. To a chemist, the word pure has a somewhat different connotation. A chemical substance may well be defined as 'any material with a definite chemical composition' in an introductory general chemistry textbook. For a pure substance the concept of standard state applies to the substance in a well defined state of aggregation at a well defined but arbitrarily chosen standard pressure. For a solute in solution it is the (hypothetical) state of solute at the standard molality m°, standard pressure p° or standard concentration c° and exhibiting infinitely dilute solution behaviour. For a pure phase, or a mixture, or a solvent in the liquid or solid state it is the state of the pure substance in the liquid or solid phase at the standard pressure p = p°. Three standard states are recognized: For a gas phase it is the (hypothetical) state of the pure substance in the gaseous phase at the standard pressure p = p°, assuming ideal behaviour. State of a system chosen as standard for reference by convention. The IUPAC definition of standard state is:
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