Grade 12 IEB Chemistry Exam
Questions & Answers 2025/2026
Molar mass - ANSWERSthe mass in grams of one mole of that substance.
Solution - ANSWERSa homogenous mixture of solute and solvent.
Solute - ANSWERSthe substance that dissolved in the solution.
Solvent - ANSWERSthe substance in which another substance is dissolved, forming a solution.
Concentration - ANSWERSthe amount of solute per unit volume of solution.
Yield - ANSWERSa measure of the extent of a reaction, generally measured by comparing the
amount of product against the amount of product that is possible.
Intramolecular bond - ANSWERSa bond which occurs between atoms within molecules.
Intermolecular force - ANSWERSa weak force of attraction between molecules, ions, or atoms of
noble gases.
Covalent bond - ANSWERSa sharing of at least one pair of electrons by two non-metal atoms.
Non-polar covalent (pure covalent) - ANSWERSan equal sharing of electrons.
, Polar covalent - ANSWERSan unequal sharing of electrons leading to a dipole forming.
Ionic bond - ANSWERSa transfer of electrons and subsequent electrostatic attraction.
Metallic bonding - ANSWERSbonding between a positive kernel and a sea of delocalised
electrons.
Electronegativity - ANSWERSa measure of the tendency of an atom to attract a bonding pair of
electrons.
Hydrocarbon - ANSWERSa compound containing only carbon and hydrogen atoms.
Homologous series - ANSWERSa series of similar compounds which have the same functional
group and have the same general formula, in which each member differs from the previous one
by a single CH2 unit.
Saturated compound - ANSWERSa compound in which all of the bonds between carbon atoms
are single bonds.
Unsaturated compound - ANSWERSa compound in which there is at least one double and/or
triple bond between carbon atoms.
Functional group - ANSWERSan atom or a group of atoms that form the centre of chemical
activity in the molecule.
Structural isomers - ANSWERScompounds having the same molecular formula but different
structural formulae.
Heat of reaction (delta H) - ANSWERSthe net change of chemical potential energy of the system.
Questions & Answers 2025/2026
Molar mass - ANSWERSthe mass in grams of one mole of that substance.
Solution - ANSWERSa homogenous mixture of solute and solvent.
Solute - ANSWERSthe substance that dissolved in the solution.
Solvent - ANSWERSthe substance in which another substance is dissolved, forming a solution.
Concentration - ANSWERSthe amount of solute per unit volume of solution.
Yield - ANSWERSa measure of the extent of a reaction, generally measured by comparing the
amount of product against the amount of product that is possible.
Intramolecular bond - ANSWERSa bond which occurs between atoms within molecules.
Intermolecular force - ANSWERSa weak force of attraction between molecules, ions, or atoms of
noble gases.
Covalent bond - ANSWERSa sharing of at least one pair of electrons by two non-metal atoms.
Non-polar covalent (pure covalent) - ANSWERSan equal sharing of electrons.
, Polar covalent - ANSWERSan unequal sharing of electrons leading to a dipole forming.
Ionic bond - ANSWERSa transfer of electrons and subsequent electrostatic attraction.
Metallic bonding - ANSWERSbonding between a positive kernel and a sea of delocalised
electrons.
Electronegativity - ANSWERSa measure of the tendency of an atom to attract a bonding pair of
electrons.
Hydrocarbon - ANSWERSa compound containing only carbon and hydrogen atoms.
Homologous series - ANSWERSa series of similar compounds which have the same functional
group and have the same general formula, in which each member differs from the previous one
by a single CH2 unit.
Saturated compound - ANSWERSa compound in which all of the bonds between carbon atoms
are single bonds.
Unsaturated compound - ANSWERSa compound in which there is at least one double and/or
triple bond between carbon atoms.
Functional group - ANSWERSan atom or a group of atoms that form the centre of chemical
activity in the molecule.
Structural isomers - ANSWERScompounds having the same molecular formula but different
structural formulae.
Heat of reaction (delta H) - ANSWERSthe net change of chemical potential energy of the system.
