Reversible+and+Irreversible+Changes

=Soluble=
 * Substances that are **soluble** (for example salt or sugar) will **dissolve** in a liquid, such as water.
 * They form a **solution**, which may be coloured (for example coffee), but is always **clear**.
 * The solid breaks down into very small particles, which cannot be seen.
 * You can **separate** the solid from the liquid by **evaporation**.

=Insoluble=
 * Substances that are **insoluble** (for example flour or sand) will not dissolve in liquid.
 * They may sink, float on the top or float around in the liquid and form a **suspension**, which looks **cloudy**.
 * You can **separate** the solid from the liquid by **filtering**.

Play this Blockbuster-style [|game] to practice using the correct vocabulary.

[|BBC] science clips