Amount of substance GapFill

No atoms are created or destroyed in a reaction. This is called  Avogadro's ruleconservation of massrelative atomic massentropy. Chemical reactions are represented using symbols to represent  electronselementsmassesvolumes, with numbers in front of them to  expandcombineprioritisebalance the equation.

The relative formula mass of a chemical can be calculated by adding together the  ratiorelative atomic masseschargesatomic numbers of the atoms. In a balanced equation, the relative formula masses of the products equals that of the  metalsmass lostprotonsreactants. If a reaction ever seems to lose or gain mass it is because  an isotopica sidean unstablea gaseous product or reactant is involved, whose mass does not get measured.  ReliabilityProbabilityDoubtUncertainty is a way of describing the accuracy of a measurement.

There are 6.02 × 10²³ atoms, molecules or ions of something in a  grambeakermolecollision. This number is called  the chargePlanck's constantthe Avogadro constantthe proton number. The mass of a substance can be calculated by multiplying the number of moles of that substance by the  number of atomsconcentrationvolumerelative formula mass of the substance.

In a chemical reaction, one reactant is in  budgetsolutionexcessdemand if there is more than enough of it to react. The other reactant is the  conservingdepreciatingbalancinglimiting reactant. The  densitymassconcentrationenergy level of a solution can be found by dividing the number of moles by the volume of the solution.