hi everyone I thought it might be useful if I made a video of definitions so inorganic and physical definitions in this video I'll do a separate one for the organic ones now definitions aren't asked as much as they used to be but they are still asked so it's really important that we know them so there's a couple of ways you could use the video to either just watch it through or you could play it and just listen to it on your phones or something like that um anyway hopefully it's useful let me know what you think in the comment section and I'll make any appropriate changes all right then here we go and just a warning that there are 51 slides okay activation energy the minimum energy needed to start a reaction by the breaking of bonds Alkali a soluble base which releases hydroxide ions atomic orbital a region of space around the nucleus that can hold up to two electrons with opposite spins Bond enthalpy The energy needed to break one mole of a specified bond in the gas state bronstad Lowry acid a proton donor bronstad Lowry base apron acceptor buffer solution a system which minimizes pH changes when small amounts of acid or base are added catalyst a substance which increases the rate of reaction by providing an alternative route of lower activation energy conjugate acid-base pair pair of species in an acid-base equilibrium that transform into each other by gain or loss of a proton concordant titers titers that agree to within 0.10 centimeters cubed of each other covalent bond electrostatic attraction between the shared pair of electrons and the nuclei of the bonded atoms d block element an atom that has its highest energy electron in a d sub shell now if it asks you for s p or F you literally just change the letter of the subshell obviously date of covalent bond or coordinate Bond shared pair of electrons in which the bonded pair has been provided by one of the bonding atoms disproportionation a redox reaction where the same element is oxidized and reduced dynamic equilibrium a continuous reaction in the closed system where the rate of the forward reaction is the same as the rate of the reverse reaction and the concentrations remain constant electronegativity the ability of an atom to attract the pair of electrons in a covalent bond empirical formula the simplest whole number ratio of atoms of each element present in a compound first electron affinity the enthalpy change when one mole of electrons is added to one mole of gaseous atoms first ionization energy The energy needed to remove one mole of electrons from one wall of gaseous atoms entropy a measure of the dispersal energy or disorder in a chemical system half-life the time taken for the concentration of a reactant to decrease by half heterogeneous equilibrium an equilibrium system where the species are in different physical States homogeneous equilibrium an equilibrium system where the species are in the same physical state homogeneous catalyst a catalyst which is in the same physical state as a reactants heterogeneous Catalyst a catalyst which is in a different physical state to the reactants hydrogen bond a strong dipole-dipole attraction between an electron deficient hydrogen atom of nhoh or HF and the lone pair on the n o or F of the neighboring molecule ligand molecular ion that can donate a pair of electrons to a central metal ion forming a coordinate Bond ENT ligand a molecular ion that can donate two pairs of electrons to a central metal ion forming two coordinate bonds ionic bond the electrostatic attraction between oppositely charged ions isotope atoms of the same element with different numbers of neutrons lattice enthalpy enthal we change when one mole of an ionic compound is formed from its gaseous ions metallic bond electrostatic attraction between metal cations and delocalized electrons mole the amount of any substance that contains 6.02 times 10 to the 23 particles order of reaction the power to which the concentration of a reactant is raised in the rate equation rate of reaction the change in the concentration of a reactant or product in a given time reduce an agent a species which donates electrons relative atomic mass the weighted main mass or the average mass of an atom of an element compared to 1 12 of the mass of an atom of carbon 12. relative isotopic mass the mass of an isotope compared to 1 12 of the mass of an atom of carbon 12. oxidizing agent a species which accepts electrons salt the product of a reaction where the h plus ion of an acid is replaced by a metal ion or an ammonium ion simple molecular lattice a three-dimensional structure of molecules held together by intermolecular forces standard solution a solution of known concentration standard enthalpy change of combustion the enthalpy change when one mole of a substance is reacted completely with oxygen under standard conditions standard enthalpy change of formation the end that we change when one mole of a compound is formed from its constituent elements understanding conditions standard enthalpy change of hydration the envelope change when one mole of gaseous ions are dissolved in water to become one mole of aqueous ions under standard conditions standard enthalpy change of neutralization the enthalpy change when an acid and base react to form a mole of water under standard conditions standard enthalpy change of solution they enthalpy change when one mole of a compound is completely dissolved in water under standard conditions strong acid an acid that fully dissociates in solution transition element a d block element that can form at least one Ion with an incomplete d subshell weak acid an acid that partially dissociates in solution where did main Mass the mass of an atom taken into account the relative abundances of all of the Isotopes and I'm afraid that is it so like I said at the start let me know what you think in the comment section and if you need any changes or you want any changes make into the format let me know and I'll certainly do that okay then cheers bye