Chemistry Tuition Singapore Secondary Science Tuition – SEPARATING SOLID-SOLID MIXTURES

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.

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