121027
The halogens
- Boiling point increases down the group
- Increasing strength of the van der waals forces
- Size of atom increases
- Increasing strength of the van der waals forces
- Electronegativity decrease down the group
- Size of the atom increases
- Electrostatic attraction between the valance electron and the nucleus decreses
- Electrostatic attraction between the valance electron and the nucleus decreses
- Size of the atom increases
- A halogen will displace a halide from a solution if
the halide is below it in the periodic table
- Chlorine and sodium hydroxide make bleach
- 2NaOH + Cl2 ---> NaClO + NaCl + H2O
- Disproportionation
- Chlorine is oxidised and reduced at the same time
- Chlorine is oxidised and reduced at the same time
- Disproportionation
- Water treatment
- 2NaOH + Cl2 ---> NaClO + NaCl + H2O
- Chlorine and water
- Cl2 + H2O <==> HCl + HClO
- water and chloric (I) acid (HClO)
- HClO + H2O <==> ClO- + H3O+
- Hypochlorous ions
- Chlorate (I) ions kill bacteria
- HClO + H2O <==> ClO- + H3O+
- Hypochlorous acid
- water and chloric (I) acid (HClO)
- Treatment of water
- Kills disease-causing microoraganisms
- Prevents reinfection
- Prevents growth of algae
- Eliminating bad tastes and smell
- Eliminating bad tastes and smell
- Kills disease-causing microoraganisms
- Chlorine is harmful
- Gas-irritates respiratory systems
- Liquid- causes severe
chemical burns
- Chlorinated hydrocarbons are
carcinogenic
- Gas-irritates respiratory systems
- Cl2 + H2O <==> HCl + HClO
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