Changes

==Key Stage 3=====Meaning===A '''neutral''' [[substance]] is one which is not an [[acid]] or a [[base]]. It has a [[pH]] of 7. ===About Neutral Substances===: All [[substance]]s with a [[pH]] of '''7''' are '''neutral'''.: '''Neutral''' [[substance]]s are not as [[corrosive]] as [[acid]]s and [[base]]s.: [[Salt]]s and [[water]] are '''neutral''' [[substance ]]s which are formed during [[neutralisation]] [[Chemical Reaction|reactions]]. ==Key Stage 4=====Meaning===A '''neutral''' [[substance]] is one which does not form any free [[Hydrogen Ion (Chemistry)|Hydrogen ions]] or [[Hydroxide Ion (Chemistry)|Hydroxide ions]] when in [[solution]] producing a [[solution]] of [[pH]] 7. ===About Neutral Substances===: All [[substance]]s with a [[pH]] of '''7''' are '''neutral'''.: [[Salt]]s are '''neutral''' [[substance]]s because they do not contain any [[Hydrogen Ion (Chemistry)|H⁺]] or [[Hydroxide Ion (Chemistry)|OH^-]] parts to the [[compound]].: A '''neutral''' [[solution]] is one which contains an equal [[concentration]] of [[Hydrogen Ion (Chemistry)|H⁺ ions]] and [[Hydroxide Ion (Chemistry)|OH^- ions]].