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===About Dissolving===
: When a [[solid]] is [[dissolve]]d it cannot be seen anymore because it has been broken down into pieces too small to see, even with a [[microscope]].
: The [[Particle Model]] can be used to explain the process of [[dissolving]].{| class="wikitable"|-|[[File:DissolvingandDiffusing.png|center|500px]]|-| style="height:20px; width:200px; text-align:center;" |This [[particle]] [[diagram]] shows the [[particle]]s in a purple [[solid]] becoming separated from one another and spreading through the [[liquid]] from a high [[concentration]] to a low [[concentration]].|} : Not all [[solid]]s can [[dissolve]] in water. A [[solid]] which can be [[dissolveddissolve]] d easily in [[water]] is described as [[soluble]] but one that cannot be easily [[dissolve]]d in [[water]] is described as [[insoluble]].: A [[solid]] that has [[dissolve]]d in a [[liquid]] is called a [[solute]] and the [[liquid]] is called a [[solvent]].: [[Conservation of Mass]] can be shown when a [[solute]] [[dissolve]]s in a [[solvent]] the total [[mass]] of the [[solution]] is the same as the total [[mass]] of the parts that made it.{| class="wikitable"|-|[[File:ConservationofMassDissolving.png|center|500px]]|-| style="height:20px; width:200px; text-align:center;" |'''Mass'''<sub>solvent</sub> + '''Mass'''<sub>solute</sub> = '''Mass'''<sub>solution</sub>|} ===Factors That Affect Dissolving===: 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]]. ====Edexcel==== :[https://www.amazon.co.uk/gp/product/1782945725/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945725&linkCode=as2&tag=nrjc-21&linkId=694be7494de75af3349537d34e13f7f0 ''Dissolving, page 84, GCSE Chemistry; The Revision Guide, CGP, Edexcel ''] ====OCR====:[https://www.amazon.co.uk/gp/product/0198359829/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359829&linkCode=as2&tag=nrjc-21&linkId=90e8d7b4f039d53035238fa0320fe00b ''Dissolving, page 42, Gateway GCSE Chemistry, Oxford, OCR '']