ICSE Class 10 Chemistry — Flashcards for Quick Revision

A: The periodic repetition of elements having similar properties after regular intervals is called periodicity.

A: The physical and chemical properties of the elements are periodic functions of their atomic weight given by Mendeleev.

A: The physical and chemical properties of the elements are the periodic functions of their atomic numbers.

A: A chemical bond is actually some sort of interatomic attraction which holds the two atoms together. A chemical bond may be ionic, covalent, coordinate or metallic in nature.

A: Atoms combine to acquire stability and a state of minimum energy. They gain, lose, or share electrons to achieve a stable electronic configuration similar to noble gases.

A: During the formation of a molecule, an atom of a particular element gains, loses or shares electrons until it acquires a stable configuration of eight electrons in its valence shell.

A: A mineral acid is an acid derived from minerals. It is usually a strong, corrosive acid and is completely ionised in water. Examples: HCl, HNO3, H2SO4. Balanced ionisation examples: HCl(aq) + H2O(l) →

A: Organic acids are derived from living organisms and contain carbon. They are weak, less corrosive, and partially ionised in water. Examples: formic acid, acetic acid, oxalic acid. Example ionisation:

A: An acid gives H3O+ ions in water. These hydronium ions are responsible for acidity. General idea: acid + water → hydronium ion + anion. Example: HCl(aq) + H2O(l) → H3O+(aq) + Cl-(aq).