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: The time it takes to [[dissolve]] a [[solid]] can be decreased by stirring the [[solution]] and by keeping the [[solution]] at a higher [[temperature]].
: The amount of [[solid]] which can be [[dissolve]]d can be increased by keeping the [[solution]] at a higher [[temperature]].
==Key Stage 4==
===Meaning===
[[Dissolving]] is an [[endothermic]] [[Physical Change|process]] in which a [[solid]] breaks apart into individual [[Molecule|molecules]] or [[Atom|atoms]] when it is [[Mixture|mixed]] with a [[liquid]].
===About Dissolving===
: A solid that has [[dissolve]]d in a [[liquid]] is called a [[solute]] and the liquid is called a [[solvent]].
: [[Dissolving]] is an [[endothermic]] process, which means it needs to [[Absorb (Physics)|absorb]] [[energy]] to take place. This means that when a [[solid]] '''dissolves''' in a [[liquid]] the [[temperature]] of the [[liquid]] decreases.
: [[Dissolving]] is a [[Physical Change|physical change]], which means it is [[Reversible Changes|reversible]] and does not produce new [[chemical]]s.
: Different [[substance]]s have a different level of [[solubility]]. The more of a [[substance]] which can be '''dissolved''' in a fixed [[Volume (Space)|volume]] of [[liquid]], the greater its [[solubility]].
: Some [[solid]]s can be '''dissolved''' in [[ethanol]] or [[oil]] but not in [[water]]. [[Lipid|Fat]]s can be '''dissolved''' in [[ethanol]] but not in [[water]]. [[Vitamin D]] can be '''dissolved''' in [[oil]] but not in [[water]].