Chemistry grade-9 (ICSE)

Symbol of an element; valency; formulae of radicals and formulae of compounds. Balancing of simple chemical equations.

Relative Atomic Masses (atomic weights) and Relative Molecular Masses (molecular weights): either - standard H atom or 1/12th of carbon 12 atom.

Types of chemical changes.

Water as a universal solvent.

Hydrated and anhydrous substances.

Soft water and Hard water

Structure of an Atom, mass number and atomic number, Isotopes and Octet Rule.

Electrovalent and covalent bonding, structures of various compounds – orbit structure

Dobereiner’s Triads, Newland’s law of Octaves, Mendeleev’s contributions; Modern Periodic Law, the Modern Periodic Table. (Groups and periods)

Position of the non-metal (Hydrogen) in the periodic table and general group

The preparation and collection of hydrogen by a standard laboratory method other than electrolysis.

Industrial manufacture of hydrogen by Bosch process.

Oxidation and reduction reactions.

The behaviour of gases under changes of temperature and pressure;

Relationship between Kelvin scale and Celsius Scale of temperature; Standard temperature and pressure.

Acid rain – composition, cause and its impact.

Global warming:

Ozone depletion