ICSE Class 9 Chemistry — Chapter Summary

Chemistry uses symbols, formulae, valency, radicals, and chemical equations to describe matter and its changes in a short and exact way. A symbol stands for one atom of an element, a formula shows the atoms present in a molecule, valency shows combining capacity, and a chemical equation gives the sy

Chemical changes happen when old bonds break and new bonds form, producing new substances. A reaction may begin when substances mix closely, are heated, exposed to light, supplied with electricity, kept under pressure, or treated with a catalyst. The chapter also shows how reactions can be identifie

Water is a compound with formula H2O and chemical name dihydrogen oxide. It is one of the most important natural resources and exists in solid, liquid, and gaseous states. Its unusual physical properties make it essential for life, climate control, and many chemical and biological processes. Water i