| A | B |
|---|
| Fluorine physical state | pale yellow gas |
| Chlorine physical state | green gas |
| Bromine physical state | red liquid |
| Iodine physical state | grey solid |
| boiling point increases.. | down the group |
| colour intensity decrease | up the group |
| atomic radius | increases down the group |
| Most electronegative element is... | fluorine |
| chlorine will displace .... | bromine from aqueous potassium bromide |
| bromine will not displace ..... | chlorine from aqueous potassium chloride |
| When chlorine displaces bromine from potassium bromide.. | bromide ions are oxidised |
| Fluorine is the .... | strongest oxidant |
| Oxidation number of F | always -1 |
| Oxidation number of Cl is -1 in .... | chlorides |
| Oxidation number of an element is .... | zero |
| electrons are lost when | oxidation occurs |
| electrons are gained when.. | reduction occurs |
| When reduction occurs .. | oxidation number decreases |
| When oxidation occurs.. | oxidation number increases |
| Disproprtionation occurs when | the same reactant is oxidised AND reduced in the same reaction |
| Halogen elements exist as .. | diatomic molecules |
| sodium halides exist... | ions |
| An oxidising agent | removes electrons from another reactant |
| A reducing agent | Gives electrons to another reactant |
| A test for chlorine.. | bleaches litmus paper |
| A test for iodine | starch solution (or paper) turns black |
| Iodine solution becomes colourless | with sodium thiosulphate |
| Concentrated sulphuric acid and sodium chloride | white acidic fumes of HCl formed |
| Concentrated sulphuric acid and sodium bromide | white fumes of HBr followed by orange bromine vapour & sulphur dioxide |
| hydrogen bromide reacts with concentrated sulphuric acid forming bromine | HBr reduces the sulphuric acid |
| HCl does not react with contrated sulphuric acid | HCl is not a strong reducing agent |
| phosphoric acid with NaBr gives mainly HBr | phosphoric acid is not such a strong oxidant as sulphuric acid |
| HCl is a strong acid | completely ionised in aqueous solution |
