Amount of substance GapFill

No atoms are created or destroyed in a reaction. This is called  entropyAvogadro's ruleconservation of massrelative atomic mass. Chemical reactions are represented using symbols to represent  elementselectronsvolumesmasses, 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 massesatomic numberscharges of the atoms. In a balanced equation, the relative formula masses of the products equals that of the  mass lostprotonsmetalsreactants. If a reaction ever seems to lose or gain mass it is because  an unstablean isotopica gaseousa side product or reactant is involved, whose mass does not get measured.  DoubtProbabilityReliabilityUncertainty is a way of describing the accuracy of a measurement.

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

In a chemical reaction, one reactant is in  excesssolutiondemandbudget if there is more than enough of it to react. The other reactant is the  conservinglimitingdepreciatingbalancing reactant. The  energy leveldensitymassconcentration of a solution can be found by dividing the number of moles by the volume of the solution.