Matching Pairs The Mole Matching GameOnline version Match the concepts related to 'The Mole' story and its characters in this fun game! by Globoi Ej 1 Percent composition 2 Reactants 3 Excess reagent 4 Mole ration 5 Stoichiometry 6 Limiting reagent 7 Products 8 Avogadro’s number a substance that undergoes change during a reaction ratio between the amount of moles of compounds in a chemical reaction the determination of proportions which elements react with one another percentage of each element that makes up a specific compound what is formed from a chemical reaction reactant that get used up in a chemical reaction 6.02x10^23 reactant that’s not used up in a reaction