A-LevelChemistryChemical bondingFeb/Mar 2017Paper 2 Q222 Marks
Hydrogen halides are compounds formed when halogens (Group 17 elements) react with hydrogen. The bond polarity of the hydrogen halides decreases from HF to HI. Some relevant data are shown in the table. hydrogen halide | HF | HCl | HBr | HI ---|---|---|---|--- boiling point/°C | 19 | -85 | -67 | -35 H–X bond energy/kJ mol⁻¹ | 562 | 431 | 366 | 299
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