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Edexcel Chemistry C3: Chemical Detection Key Words

Key WordDefinition
acidA chemical substance (typically, a corrosive or sour-tasting liquid) that neutralizes alkalis, dissolves some metals, and turns litmus red.
anionA negatively charged ion, i.e., one that would be attracted to the anode in electrolysis.
Avogadro's lawOne mole of any gas occupies 24dm3 at room temperature (25oC)
baseA substance capable of reacting with an acid to form a salt and water, or (more broadly) of accepting or neutralizing hydrogen ions
cationA positively charged ion, i.e., one that would be attracted to the cathode in electrolysis
flame testA procedure used in chemistry to detect the presence of certain metal ions, based on each element's characteristic emission spectrum.
indicatorA dye that changes colour depending on whether it's above or below a certain pH
ionAn atom or molecule with a net electric charge due to the loss or gain of one or more electrons
ionic substanceForms giant ionic lattices containing oppositely charged ions.
molar volumeThe molar volume, symbol Vm, is the volume occupied by one mole of a substance
moleThe name given to a certain number ( 6.023 x10^23 )
precipitationPrecipitation is the formation of a solid in a solution or inside another solid during a chemical reaction or by diffusion in a solid. When the reaction occurs in a liquid, the solid formed is called the precipitate.
purityThe state or degree of being pure
qualitativeQualitative analysis tells you if a particular substance is present; but not how much of it there is.
quantitativetells you how much of a particular substance is present.
reactantA substance that takes part in and undergoes change during a reaction
titrationused to find out concentrations