Amount of substance, yield and atom economy GapFill

No atoms are created or destroyed in a reaction. This is called  conservation of massAvogadro's rulerelative atomic massatom economyparticle theoryentropy. Chemical reactions are represented using symbols to represent  volumesmoleselectronsconcentrationsmasseselements, with numbers in front of them to  time-stampbalanceexpandcombineprioritisesequence the equation.

The relative formula mass of a chemical can be calculated by adding together the  atomic numbersratiorelative atomic massesvolumeschargesconcentrations of the atoms. In a balanced equation, the relative formula masses of the products equals that of the  reactantsprotonsair or solutionmass losttheoretical massmetals. If a reaction ever seems to lose or gain mass it is because  an unreactivea gaseousa radioactivea sidean isotopican unstable product or reactant is involved, whose mass does not get measured.  ReliabilityDoubtUncertaintyEstimationProbabilityCorrectness is a way of describing the accuracy of a measurement.

Percentage yield is calculated as the percentage of the  balanced equationrelative formula masstheoretical massmost useful productactual masssolid product(s) that is actually made. Percentage yield might decrease because some of the reactants either  change statelose massare unstabledo not reactget used upescape or react to form other products.

 Avogadro's ruleRelative atomic massConservation of massRate of reactionReactant-to-product ratioAtom economy is a way of comparing reactions to see which utilises the most  surface areaenergyatomsheatuncertaintyreactants. It is better for this to be higher because it is more economic and  ethicalexpensiveeasiersafersustainableenergy-intensive.