Tariff schedule amendment expands tariff classifications, revises duty headings and introduces new sub heading definitions and rates. Amendment of the First Schedule to the Central Excise Tariff Act recodifies tariff headings, sub headings and items across multiple chapters, substituting detailed commodity descriptions, inserting and omitting specific tariff lines, and revising units and duty entries. It also adds and modifies Sub heading and Chapter Notes to define terms (such as water pipe tobacco, biodiesel and chemically defined mercury compounds) and to clarify coverage, thereby altering classification and duty treatment for agricultural, aquatic, chemical, petroleum, textile and manufactured goods.