Is Matter Around Us Pure

In chemistry, fractional crystallisation is the method of refining substances based on differences in solubility. If a mixture of two or more substances in solution is allowed to crystallise, e.g. by allowing the temperature of the solution to decrease, the precipitate will contain more of the least soluble substance.

Sublimation is the transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase. Sublimation is an endothermic phase transition that occurs at temperatures and pressures below the triple point of a substance in its phase diagram.

A compound is a substance formed when two or more elements are chemically bonded together. Two types of chemical bonds common in compounds are covalent bonds and ionic bonds. The elements in any compound are always present in fixed ratios.

Plutonium is a transuranic radioactive chemical element with symbol Pu

A metalloid is a chemical element with properties in between, or that are a mixture of, those of metals and non - metals

In chemistry, a mixture is a material system made up of two or more different substances which are mixed but are not combined chemically. A mixture refers to the physical combination of two or more substances on which the identities are retained and are mixed in the form of solutions, suspensions, and colloids.

Argon is a chemical element with symbol Ar and atomic number 18. It is in group 18 of the periodic table and is a noble gas.

In chemistry, concentration is the abundance of a constituent divided by the total volume of a mixture.

Water = H2O Reaction: Na2O + H2O ==> 2NaOH NaOH = Sodium Hydroxide

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: The term saturated solution is used in chemistry to define a solution in which no more solvent can be dissolved. It is understood that saturation of the solution has been achieved when any additional substance that is added results in a solid precipitate or is let off as a gas.

A homogeneous mixture is a type of mixture in which the composition is uniform. A heterogeneous mixture is a type of mixture in which the composition can easily be identified since there are two or more phases present. Air is a homogeneous mixture of the gaseous substances nitrogen, oxygen, and smaller amounts of other substances. Salt, sugar, and many other substances dissolve in water to form homogeneous mixture.

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Solvent extraction is a process whereby two immiscible liquids are vigorously shaken in an attempt to disperse one in the other so that solutes can migrate from one solvent to the other. The picture on the right shows the shape of a traditional separatory funnel.

Tyndall effect is the effect of light scattering in many directions in colloidal dispersion, while showing no such effect in a true solution. This effect is used to determine whether a mixture is a true solution or a colloid.