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Question English Answer English
Dynamic equilibrium
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The rates of the forward and reverse reactions are equal
Kinetic energy
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The energy associated with moving particles
Concentration
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The amount of solute dissolved in a solution
Le Chatelier's Principle
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States that a disturbance to the equilibrium will result in the system adjusting to compensate for the change, and equilibrium is re-established. Some changes include temperature, concentration or pressure.
Catalyst
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A substance that increases the rate of a reaction without itself being consumed in the reaction (also lowers activation energy, thus the reaction reaches equilibrium quicker)
Equilibrium constant (Kc)
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Only temperature can affect the value of Kc*
Self-ionisation of water
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The reaction in which a water molecule loses a hydrogen ion to become a hydroxide ion (OH-) and the hydrogen ion immediately reacts with another water molecule to form a hydronium ion (H3O+)
Esterification
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A condensation reaction between a carboxylic acid and alcohol that generates an ester
Proton donor
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A substance that can donate H+
Monoprotic
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An acid that can donate only one hydrogen ion per molecule
Polyprotic
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An acid that can donate more than one hydrogen ion per molecule
Strong base
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A base that completely ionises in water
Weak base
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A base that doesn't completely ionise in water
Alkaline
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Basic solution
Hydroxyl
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A functional group consisting of an -OH group, which is an oxygen atom and a hydrogen atom joined by a single bond
Carboxylic acid
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A class of organic compound that contains a carboxyl functional group
Electrical conductivity
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The degree to which a material conducts an electric current
Strength
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The level of dissociation of an acid or a base
Strong acid
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An acid that completely ionises in water
Weak acid
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An acid that does not completely ionise in water
Ionic product constant of water (Kw)
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The equilibrium constant for the self-ionisation of water
pH
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A measure of hydrogen ion concentration in a solution and therefore a measure of the acidity or alkalinity of a solution
Limiting reagent
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The reactant in a chemical reaction that determines how much product is made
Conjugate base
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A base formed by removing an H+ from an acid
Conjugate acid
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An acid formed when a base accepts an H+
Amphiprotic
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A molecule or an ion that can either donate or accept a proton and therefore can act as an acid or a base
Buffer solution
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A solution that resists changes in pH when small quantities of acids or alkalis are added
Titration
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The addition of a solution of known concentration to a known volume of another solution of unknown concentration until the reaction reaches neutralisation
Titration curve
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A graph of pH against volume of reactant added
Acid dissociation constant (Ka)
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The equilibrium constant for the dissociation of an acid in aqueous solution
Base dissociation constant (Kb)
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The equilibrium constant for the dissociation of a base in aqueous solution
Indicator
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A chemical substance that changes colour at different pH values
pKa
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A measure of acid strength; the negative common logarithm (to base 10) of an acid dissociation constant
End point
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The point in a titration when the indicator changes colour
Equivalence point
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The point in a titration when the reactants have reacted in the molar ratio of the balanced chemical equation
Standard solution
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A solution of accurately known concentartion
Volumetric analysis
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A quantitative analytical technique for determining the concentration of a solution by titrating it against another solution of known concentration
Half-equivalence point
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A point in a titration curve where the concentration of the titre is equal to half the original concentration of the analyte; also called the midpoint
Buffer region
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The section of a titration curve is relatively flat because adding more acid or base does not drastically affect the pH
Analyte
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A solution of unknown concentration
Oxidation Reaction
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An organic reaction involving the gain of oxygen atoms and/or the loss of hydrogen atoms.
Redox
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A chemical reaction involving the transfer of electrons from one reactant to another
Oxidise
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To lose electrons
Reducing Agent
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A reactant that causes another reactant to gain electrons and be reduced and is itself oxidised.
Oxidising Agent
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A reactant that causes another reactant to lose electrons and be oxidised and is itself reduced
Redox Reaction
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A reaction involving oxidation of one reactant and reduction of the other reactant
Cathode
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The electrode where reduction occurs
Polarity
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The change of an electrode, either positive or negative
Electrode
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A solid conductor of electricity either into or out of a half-cell
External circuit
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The electric circuit (wires) that allows electron movement from anode to cathode.
Salt bridge
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An electrical connection between the two half-cells in a galvanic cell; it allows for the flow of charge by moving ions to the cathode and anions to the anode
Half-cell
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Half of an electrochemical cell, where either oxidation or reduction occurs
Internal Circuit
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The part of an electrochemical cell that allows for ion flow, e.g. the salt bridge
Cell Diagram
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A diagram of a galvanic cell that has all the key components, reaction mechanisms and electron/ion movement labelled
Fuel Cell
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A galvanic cell that produces electricity by using a constant supply of reactants (often hydrogen and oxygen) and inert electrodes that don't break down
Inert Electrode
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An electrode that conducts electricity in the half-cell, but doesn't participate in the reaction, i.e. it's neither a reactant nor product
Alkaline Fuel Cell
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A fuel cell that consumes hydrogen and oxygen, producing water, heat and electricity
Standard Electrode Potential
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The electrical potential that an electrode generates under standard conditions
Standard Conditions
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The conditions under which all E^0 values are measured: 25 °C, 1 atm and 1M electrolyte.
Cell Potential Difference
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The electrical potential difference (V) between two electrodes; the voltage that the galvanic cell can generate under standard conditions.
Electromotive Force (EMF)
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The difference in potential across a cell that generates electricity.
Molten
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A substance that has been melted to form a liquid
Electrolyte
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A substance that conducts electricity when melted or dissolved in a solution.

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