Define a pure substance and identify pure substances and mixtures from data about melting and boiling points
Describe a formulation and identify formulations given appropriate information
Describe chromatography, including the terms stationary phase and mobile phase and identify pure substances using paper chromatography
Explain what the Rf value of a compound represents, how the Rf value differs in different solvents and interpret and determine Rf values from chromatograms
Required practical 12: investigate how paper chromatography can be used to separate and tell the difference between coloured substances (inc calculation of Rf values)
Explain how to test for the presence of hydrogen, oxygen, carbon dioxide and chlorine
Videos
Free Science Lesson
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