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Chemistry From ‘I Don’t Get It’ to ''I Ace It''
● Chapter 9 Topics
Heat Content (H): The amount of potential energy stored in 1 mole of any substance.
Enthalpy Change (ΔH): Measures the difference between the heat content of the products and that of the reactants.
Exothermic Reaction: A reaction in which the heat content of the products is less than the heat content of the reactants, energy is released.
Endothermic Reaction: A reaction in which the heat content of the products is more than the heat content of the reactants, energy is absorbed.
Bond Energy: The amount of energy needed to break a bond (usually measured in kJ/mole).
Calorimetry: The measurement of the heats of reactions. A calorimeter is the device used to measure the heat of a reaction.
Hess’s Law: The heat evolved or absorbed by a reaction is independent of the path followed and depends only on the initial reactants and final products and their states.
Electrical Work: The energy supplied by an electric current. Electric energy, W = I×V×t.
Kinetic Energy: The energy due to motion, expressed as ½ mv².
Potential Energy: The energy due to position, expressed as mgh.
Properties of Subatomic Particles Involved in Nuclear Reactions: Understand the properties of subatomic particles involved in nuclear reactions.
Conservation in Nuclear Reactions: In nuclear reactions, charge, number of protons, number of electrons, and number of neutrons are conserved.
Fission Reaction: A nuclear reaction in which a heavy nucleus splits into two nuclei.
Fusion Reaction: A nuclear reaction in which 2 nuclei combine to form a heavier, more stable nucleus.
Mass of a Nucleus: The mass of a nucleus could be different from the sum of the masses of its nucleons.
Energy Conversion: The difference in mass is transferred to energy according to the equation: E = mc².