ICSE Chemistry requires calculating quantitative stoichiometric relations alongside descriptive chemical properties of acids, bases, and industrial compounds.
1. Mole Concept and Stoichiometry
Always set up a 4-column table for empirical formula determinations: Element $\rightarrow$ Percentage Composition $\rightarrow$ Atomic Mass $\rightarrow$ Relative Number of Moles $\rightarrow$ Simple Whole-Number Ratio. Never round off intermediate decimals prematurely.
2. Metallurgy of Aluminium (Hall-Héroult Process)
State the specific roles of Cryolite ($Na_3AlF_6$) and Fluorspar ($CaF_2$): they lower the fusion temperature of alumina from $2050^\circ\text{C}$ to $950^\circ\text{C}$ and enhance electrical conductivity.
