Chemistry Inorganic Organic Physics Physical Biology AnalyticalScience Geology Bio Polymer Medicine Industrial Materials Nano Pharmacy
Atom MoleculeIndivisible Can split in to componentsSmallest particle of an Smallest particle of aelement compoundIt may or may not exist It can exist in the freein the free state stateAtoms take part in During chemicalchemical reaction reaction molecules split in to atoms.
1 Write down the symbols or formulae of two radicals (A & B) side by side, positive A on the left and negative B on the right side. A = Al B = Cl Al Cl2 Write their valences at the top Al3 Cl13 Cross the valences. Al3 Cl1 = AlCl34 Complex radicals are enclosed in brackets. (NH4)2SO4
Molecular Formula of a compound is asymbolic representation of a moleculeof the compound.Molecular Formula Indicates;a) Actual number of atoms of the elements in a molecule of the compound.b) The molar mass of the substance.
Molecular Formula of Water is H2OThis indicates one molecule ofwater contains two hydrogen atomsand one oxygen atom.Molar mass of H2O is , 1x2 + 16 = 18 g mole-1