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12327140
Chemical Analysis 1
Descrição
Chemistry 2
Sem etiquetas
aqa
chemistry
chemistry
gcse
Mapa Mental por
D B
, atualizado more than 1 year ago
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Criado por
D B
mais de 6 anos atrás
7
2
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Resumo de Recurso
Chemical Analysis 1
Chromatography
Separating technique that separates substances based on solubility in a particular substance
Identifies additives/pesticides in food,dugs & alcohol,water samples for pollution,crime investigation,inks...
Paper Chromatography
Separates according to size of particle
Solvent rises through paper
Dissolves sample picture
Small particles(more soluble) will travel further than large particles
Retention Factor(RF Factor)
Used to compare the components of various other samples
Rf=distance from the base line to the spot÷distance from base line to solvent front
Identification of gases
Hydrogen
A lighted splint should make a "pop" noise
Oxygen
A glowing splint will relight
Carbon Dioxide
Limewater gets cloudy if gas is present
Chlorine
Makes damp blue litmus paper turn red(indicates chlorine is acidic),then white
The Flame Test
Place small amount of compound in a nichrome loop which has been cleaned with HCL & heated
Dip once again n HCL before taking the metal ion
Hold loop in roaring blue flame & flame will change colour
Lithium-Crimson
Sodium-yellow
Potassium-lilac
Barium-green
Calcium-red
Copper-green
Metal Hydroxides
Solutions of aluminium,calcium & magnesium ions with sodium hydroxide form precipitates
Precipitate-Insoluble solid formed in the reaction
Copper(II)-blue
Iron(II)-green(turns orange brown when left)
Iron(III)-orange-brown
Anexos de mídia
2018 02 17 18.03.12 (binary/octet-stream)
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