• Chemistry Tuition Singapore Secondary Science Tuition – Separating Mixtures Solid – Solid

    Chemistry Tuition Singapore Secondary Science Tuition – Separating Mixtures Solid – Solid

    SEPARATING MIXTURES

    • There are physical methods which can be used to separate a mixture to obtain pure substances again.
    • The choice for selecting a suitable physical method is determined by the nature of the mixture.

    Solid-solid

    Two different solid substances mixed together such as sand with salt or iron powder with sulfur

    Solid-liquid

    Salt solution, sugar solution

    Liquid-liquid

    Alcoholic solution, crude oil

    Quantity of components

    Sample containing minute amount of components such as food dyes, food colouring and inks

    SEPARATING SOLID-SOLID MIXTURES

    Magnetic attraction

    This technique uses magnets to separate magnetic substances from a mixture. Examples of magnetic substances are iron, steel, nickel and cobalt.

    For example

    A magnet can be used to separate iron from sulfur in a mixture of iron and sulfur.

    Sublimation*

    • It is used when a mixture contains a solid substance which sublimes upon heating. Examples of solid substances which undergo sublimation are iodine crystals, naphthalene (mothballs) and dry ice.

    For example

    Iodine crystals can be separated from salt crystals by heating the mixture until the iodine crystals sublime.

    Please contact Angie @ 96790479 or Mr Ong @ 98639633 if you need Chemistry Tuition Lower Secondary Science Tuition Singapore.

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