May be either homogeneous or heterogeneous.The properties of the resulting mixture is an average of the properties of the constituents.Impure substances have the following properties : Homogeneous mixtures have a uniform composition throughout the volume of the substance whereas the heterogeneous mixture contains a varying composition. Mixtures can be categorized into homogeneous and heterogeneous mixtures. Sublimation results in the extraction of common salt, since the moth balls directly pass into the vapour state. For instance, a mixture of naphthalene balls and common salt can be separated by performing sublimation. Impure substances can be converted to pure ones by using different separation techniques. They do not possess constant or fixed structure throughout. Impure substances, also termed as mixtures are composed of atoms or molecules belonging to different types. Possess fixed melting and boiling points.Pure substances have the following properties: These substances can be broken down and transformed into new substances by chemical methods. For instance, gold and silver are elements.Ī compound is a pure substance where two or more elements are combined using chemical means in a fixed defined ratio. Elements are mostly categorized into metals, non-metals or metalloids. It can neither be broken down nor transformed into new substances by any kind of processes, be physical or chemical process. Pure substances can be further categorized into elements and compounds respectively:Īn element is considered to be a pure substance consisting of singular type of atoms.
Pure substances are composed of a single or atomic type of particles. ISRO CS Syllabus for Scientist/Engineer Exam.ISRO CS Original Papers and Official Keys.GATE CS Original Papers and Official Keys.
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