colour+changes

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 * **Reaction** ||  **From**  ||  **To**  ||
 * Alkenes and bromine water || orange || colourless ||
 * Alkanes and bromine water || orange || remains orange ||
 * Chlorine with **damp** litmus || blue || red then **white/bleached** ||
 * Hydrogen chloride – dry with blue litmus || blue || remains blue ||
 * Hydrogen chloride with **damp** blue litmus/hydrogen chloride in water with blue litmus || blue || red ||
 * Hydrogen chloride in methylbenzene with dry litmus || blue || blue ||
 * Test for the presence of water – anhydrous copper sulphate || white || blue ||
 * Reaction of copper with **concentrated** nitric acid ||  || blue solution and brown fumes ||
 * Reaction of copper (II) salts with sodium hydroxide (test for Cu2+) || blue solution and colourless solution || light blue precipitate ||
 * Reaction of iron(II) salts with sodium hydroxide – test for Fe2+ || green solution || green precipitate ||
 * Reaction of iron(III) salts with sodium hydroxide – test for Fe3+ || orange brown solution || red brown precipitate ||
 * Sodium chloride + nitric acid + silver nitrate – test for Cl- || colourless solution || white precipitate ||
 * Sodium bromide + nitric acid + silver nitrate – test for Br- || colourless solution || pale cream precipitate ||
 * Sodium iodide + nitric acid + silver nitrate – test for I- || colourless solution || yellow precipitate ||
 * Sulphate compounds and barium chloride || colourless solution || white precipitate ||
 * Heating copper carbonate || green solid || black solid ||
 * Zinc or magnesium in copper sulphate solution || grey metal in blue solution || colourless solution and black solid ||
 * Magnesium burning forming magnesium oxide || silvery shiny solid || white solid ||
 * Colours of groups 1 and 2 compounds || white solids || colourless if dissolved in water ||
 * Hydrochloric acid and ammonia - neutralization || two colourless gases || white solid ||
 * Chlorine water and sodium bromide solution || two colourless solutions || yellow solution ||
 * Chlorine water and sodium iodide solution || two colourless solutions || brown solution ||
 * Bromine water and sodium iodide solution || two colourless solutions || brown solution ||
 * Heating hydrated copper sulphate || blue solid || white solid ||