Basic purpose of this lecture is present on Limestone, Oil and Fractional Distillation. This lecture is tutorial based presentation. Limestone is a sand rock made up of mainly calcium carbonate. It’s cheap and easy to obtain. Here also briefly describe on Hydrocarbons and crude oil and Fractional distillation. Crude oil can be separated by fractional distillation. The oil is evaporated and the hydrocarbon chains of different lengths condense at different temperatures.