IEB Matric Chemistry Definitions Exam

IEB Matric Chemistry Definitions Exam Molar mass - ANS-The mass in grams of one mole of that substance Solute - ANS-The substance that is dissolved in the solution Solvent - ANS-The substance in which another substance is dissolved, forming a solution Concentration - ANS-The number of moles of solute per unit volume of solution Standard solution - ANS-Solution of known concentration Intramolecular bond - ANS-Occurring between atoms within molecules Electronegativity - ANS-Measure of the tendency of an atom to attract a bonding pair of electrons Covalent bond - ANS-A sharing of at least one pair of electrons between atoms Non-polar covalent (pure covalent) - ANS-An equal sharing of electrons Polar covalent - ANS-Unequal sharing of electrons leading to a dipole forming (as a result of electronegativity difference) Ionic bond - ANS-A transfer of electrons and subsequent electrostatic attraction Metallic bonding - ANS-Being between a positive kernel and a sea of delocalized electrons Intermolecular force - ANS-Weak force of attraction between molecules or between atoms of noble gases Heat of reaction - ANS-The net change of chemical potential energy of a system Exothermic reactions - ANS-Reactions which transfer potential energy into thermal energy Endothermic reactions - ANS-Reactions which transfer thermal energy into potential energy Activation energy - ANS- Continues...