F325 definitions

Definitions required for the topic Chemistry F325

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  • Created by: Amelia
  • Created on: 11-06-11 09:28

First electron affinity

The enthalpy change that accompanies the addition of one electron to each atom in one mole of gaseous atoms to form one mole of gaseous 1- ions

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Second Electron Affinity

the enthalpy change that accompanies the addition of one electron to each ion in one mole of gaseous 1- ions to form one mole of gaseous 2- ions

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Enthalpy change of Atomisation

enthalpy change that takes place when one mole of gaseous atoms forms from its elements in standard states

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First Ionisation Energy

the energy required to remove one electron from each atom in one mole of gaseous atoms to form one mole of gaseous 1+ ions

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Second Ionisation Energy

The energy required to remove one electron from each ion in one mole of gaseous 1+ ions to form one mole of gaseous 2+ ions

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Ligand

A molecule or ion that can donate a pair of electrons with the transition metal ion to form coordinate bonds

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Oxidising Agent

A reagent that oxidises (takes electrons from) another species

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Reducing Agent

A reagent that reduces (adds electron to) another species

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Enthalpy of hydration

enthalpy change that takes place when one mole of isolated gaseous ions are dissolved in water, forming one mole of aqueous ions under standard conditions

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Enthalpy Change of Solution

Enthalpy change that takes place when one mole of a compound is completely dissolved in water under standard conditions

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Entropy

The quantitative measure of degree of disorder in a system

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Initial Rate of Reaction

The change in concentration of a reactant or product per unit time at the start of a reaction

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Enthalpy change of Neutralisation

the energy change that accompanies the neutralisation of an aqueous acid by an aqueous base to form one mole of water under standard conditions

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Acid-Base pair

a pair of 2 species that can transform into each other by gain or loss of a proton

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Bond dissociation enthalpy

the enthalpy change that takes place when breaking by homolytic fission one mole of a given type of bond in molecule of a gaseous species

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Bronsted-Lowry acid

species that is a proton donor

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Bronsted-Lowry Base

species that is a proton acceptor

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Kstab

is the stability constant in an equilibrium existing between a transition metal ion surrounded by water ligands and the complex formed when that same ion has undergone a ligand substitution reaction

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standard electrode potential

the emf of a half cell compared to a standard hydrogen half cell measured at 298K, in solution concentrations of 1moldm^-3 and under pressures of 100kpa

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strong acid

acid that completely dissociates in solution

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weak acid

acid that partially dissociates in solution

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Transition element

elements that have an ion with a partially filled d-subshell

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bidentate ligand

molecule/ion capable of forming 2 dative covalent bonds with a metal ion

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Lattice enthalpy

the energy change that takes place when one mole of an ionic solid is formed from its constituent gaseous ions under standard conditions

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Buffer Solution

a system that minimises the Ph changes on addition of a small amount of acid or base

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complex ion

a transition metal ion bonded to one or more ligands by a coordinate bond

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coordination number

the total number of coordinate bonds formed between the central metal ion and any ligands

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Conjugate acid

species formed when a proton is added to a base

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conjugate base

species formed when a proton is added to an acid

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Comments

Megan

Thanks, this is really good for last minute revision :D

dan

Great resource, I think the very last definition is wrong tho...

i recon it should be "species formed when a proton is removed from an acid"

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