Stoichiometry and calculations based on stoichiometry

Stoichiometry and calculations based on stoichiometry Stoichiometry is the calculation of the quantities of reactants and products involved in a chemical reaction. The word ‘Stoichiometry’ is derived from two Greek words – stoicheion (meaning element)

Percentage composition of a compound

Percentage Composition Percentage composition of a compound is the relative mass of each of the constituent elements in 100 parts of it by mass. The percent composition of a compound is expressed by identifying the

Dalton’s Atomic Theory

Dalton’s Atomic Theory Dalton put forward his theory in 1803. He proposed that compounds were formed by the combination of atoms of different elements in small, whole number ratios, but had no certain method for

Atomic mass and Gram atomic mass

Atomic mass Every particle of matter has some amount of mass associated with it whether small or large. Everything is made up of atoms. Mass of an atomic particle is called the atomic mass. This

Fajan’s rule | Polarisation in a molecule

Fajan’s rule: Polarisation (Change of Ionic Character to Covalent Character) When two oppositely charged ions of unequal size approach each other closely (during formation of an electrovalent bond), the ion smaller in size attracts outermost

Valence Bond Theory (VBT)

Valence Bond Theory (VBT) This theory was presented by Heitler and London to explain the formation of covalent bond. The main postulates of this theory are: (i) A covalent bond is formed by the overlapping

Properties of a Covalent Bond

Properties of Covalent Bonds: Bond Length: Internuclear distance between two atoms in a molecule is called bond length. Bond length in covalent compound (AB) = rA + rB The following factors affect the bond length

What is a Covalent bond | How is it formed?

Covalent Bond A covalent bond may be defined as the bond formed by mutual sharing of electrons between the combining atoms. Examples: 1. Formation of chlorine molecule Chlorine atom has seven electrons in the valency

Electrovalent or Ionic Bond

Electrovalent or Ionic Bond (a) Chemical bond formed between ions is called ionic bond. (b) Ionic bonds are formed by loss and gain of e– between two atoms. (c) The electrostatic force of attraction developed