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===About Conservation of Mass===
: In a [[Chemical Reaction|chemical reaction]] '''conservation of mass''' means that the same [[atom]]s with made up the [[reactant]]s must make up the [[product]]s. So the [[atom]]s are not created or destroyed in a [[Chemical Reaction|chemical reaction]], they are just rearranged.
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'''Conservation of mass''' tells us that if there are 4 [[Hydrogen]] [[atom]]s and 2 [[Oxygen]] [[atom]]s at the start of this [[Chemical Reaction|reaction]] then there will be the end of the [[Chemical Reaction|reaction]] 4 [[Hydrogen]] [[atom]]s and 2 [[Oxygen]] [[atom]]s at the end of the [[Chemical Reaction|reaction]].
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In this [[Chemical Reaction|reaction]] you can see that '''mass is conserved''' because there are 4 [[Hydrogen]] [[atom]]s, 4 [[Oxygen]] [[atom]]s and 1 [[Carbon]] [[atom]] in the [[reactant]]s and all the same [[atom]]s are found in the [[product]]s.
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