4. (a) Define chemical bond. Explain the ionic bond with example. (b) Write down the characteristics of transition element. (d) What is the molarity of a solution prepared by dissolving 1.575 g of pure Na2CO; (M.W.=106) in 200mL of solution?

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".