BMAT SECTION 2 CHEMISTRY PRACTICE QUESTIONS AND ANSWERS

Test for hydrogen Squeaky pop Test for a Carbonate anion (CO32-) React with an acid to release carbon dioxide gas. Effervescence is observed and the production of carbon dioxide can be confirmed using limewater. ALTERNATIVLEY: A solution of a carbonate will also be alkaline, which can be shown using universal indicator or a pH probe. Ionic equation when testing for a carbonate anion: 2H+(aq) + CO32−(aq) → H2O(l) + CO2(g) Silver compounds are all ______________ except for ________________. This means that any ____________ which is not a nitratre ion will bond to ___________ to form a _____________ insoluble silver nitrate anion/negatively charged ion Ag+ precipitate The test for halide ions in aqueous solution: Add dilute nitric acid + a few drops of silver nitrate solution The test for iodide ions in aqueous solution: Add dilute nitric acid + a few drops of silver nitrate solution Yellow precipitate The test for bromide ions in aqueous solution: Add dilute nitric acid + a few drops of silver nitrate solution Cream precipitate The test for chlorine ions in aqueous solution: Add dilute nitric acid + a few drops of silver nitrate solution White precipitate Test for sulphate ions Addition of dilute nitric or hydrochloric acid to the unknown solution, therefore any hydroxide or carbonate ions are removed, followed by a solution of barium nitrate or chloride. A white precipitate indicates the presence of sulphate ions.