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==Key Stage 3==
===Meaning===
[[Conservation of Mass]] is a law of the universe that states that [[mass ]] cannot be created or destroyed, it can only be moved from one place to another.
===About Conservation of Mass===
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: In a [[Chemical Reaction|chemical reaction]] '''conservation of mass''' means that the same [[atom]]s with which 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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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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==Key Stage 4==
===Meaning===
[[Conservation of Mass]] is a law of the universe that states that [[mass]] cannot be created or destroyed, it can only be moved from one place to another.
===About Conservation of Mass===
: In a [[Chemical Reaction|chemical reaction]] law of '''conservation of mass''' indicates that the total [[mass]] of the [[product]]s is the same as the total [[mass]] of the [[reactant]]s.
===Examples===
Methane + Oxygen → Water + Carbon Dioxide
CH<sub>4</sub> + 2O<sub>2</sub> → 2H<sub>2</sub>O + CO<sub>2</sub>