IGCSE›Oxford AQA IGCSE Chemistry›Mind mapsConservation of MassOxford AQA IGCSE Chemistry: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsEquationsWord equation names reactants and productsBalanced symbol equation uses formulae2 Mg+OX2→2 MgO\ce{2Mg + O2 -> 2MgO}2Mg+OX22MgOReactants left, products rightState symbols(s) solid(l) liquid(g) gas(aq) dissolved in waterMassconservation of mass(s)(l)(g)(aq)The lawNo atoms lost or madeAtoms are rearrangedMass of products equals mass of reactantsSame atoms both sides when balancedApparent changesMg burning: mass increases, oxygen entersHeating carbonate: mass decreases, CO2 escapesGas enters or leaves an open containerExam tipsInclude state symbols when you can work them outExplain mass changes by gas movement