Category Archives: 2.3 Group 7(17) the halogens

Uses of chlorine and chlorate(I)

The reaction of chlorine with water to form chloride ions and chlorate(I) ions. The reaction of chlorine with water to form chloride ions and oxygen. Appreciate that society assesses the advantages and disadvantages when deciding if chemicals should be added to water supplies. The use of chlorine in water treatment. Appreciate that the benefits to health of water treatment by chlorine outweigh its toxic effects. The

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Trends in halogen physical properties

General properties Halogens: F2           pale yellow-green gas Cl2          pale green gas Br2          orange/brown liquid I2           black/grey solid (purple fumes following sublimation) At2         (radioactive element,  further knowledge about its chemistry is generally excluded from A2 syllabi) Halide ions: F−        

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