Stoichiometry is coined from two words: Stoicheon (atom) and metron (measurement). It is actually deals with chemical calculation based on the elementary particles of matters such calculation highlight the relationships between the composition or chemical reactions of matters and the mole (a unit that describe a quantity of elementary particles)
Before we proceed into stoichiometry formula, stoichiometry can be group into two namely
Stoichiometry of reaction Stoichiometry of composition.
Hope you understand the meaning stoichiometry and what is use for now let move to formulas and how to use it in questions.
The first things to note is the anion and cation Which is called electrochemical series of an element this can easily help to balance equation and also help in some aspect of solving stoichiometry questions.
Cation is a charges that metals carries, they are normally donates electron to non metal and this make them to become more positive change, their ability to transfer electron decrease as we move down the series.
For quick remember I represent each metals using mnemonic
Keep new car moving at zero free some people have cool house at ajar
K+1 ——- Keep ——— Potassium
Na+1 ——– New ———— Sodium
Ca+2 ——- Car ———— Calcium
Mg+2 ——- moving ——— magnesium
Al+3 ———At ————- Aluminium
Zn+1——–zero ————- Zinc
Fe+2 ——- free ——– iron
Sn+2 ——- some ——–zinc
Pb+2 ——- people ——- Lead
H+1 ——– have ——– Hydrogen
Cu2+ ——— cool ——- Copper
Hg+2——- house ——– Mercury
Ag+ ——– at ———– Silver
Au+—– ajar ———– Gold
That’s oxidation number, charges, valences, or cation of some common metals.
Note their electropositivity decreasing down from Potassium to Gold
Anion are charges that are carried by non-metal atoms or compounds and they .
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