![]() | [me-17] The reactions in the blast furnace to produce iron are summarised by equations (1) to (4). The symbol equations may NOT be numerically balanced. ... (1) C + O2 ==> CO2 ... (2) CO2 + C ==> CO ... (3) Fe2O3 + CO ==> Fe + CO2 ... (4) CaCO3 + SiO2 ==> CaSiO3 + CO2 Which statement is TRUE? |
![]() | [me-18] The reactions in the blast furnace to produce iron are summarised by equations (1) to (4). The symbol equations may NOT be numerically balanced. ... (1) C + O2 ==> CO2 ... (2) CO2 + C ==> CO ... (3) Fe2O3 + CO ==> Fe + CO2 ... (4) CaCO3 + SiO2 ==> CaSiO3 + CO2 Which statement is TRUE? |
![]() | [me-19] The reactions in the blast furnace to produce iron are summarised by equations (1) to (4). The symbol equations may NOT be numerically balanced. ... (1) C + O2 ==> CO2 ... (2) CO2 + C ==> CO ... (3) Fe2O3 + CO ==> Fe + CO2 ... (4) CaCO3 + SiO2 ==> CaSiO3 + CO2 Which statement is TRUE? |
![]() | [me-20] The reactions in the blast furnace to produce iron are summarised by equations (1) to (4). The symbol equations may NOT be numerically balanced. ... (1) C + O2 ==> CO2 ... (2) CO2 + C ==> CO ... (3) Fe2O3 + CO ==> Fe + CO2 ... (4) CaCO3 + SiO2 ==> CaSiO3 + CO2 Which statement is TRUE? |
![]() | [me-21] The reactions in the blast furnace to produce iron are summarised by equations (1) to (4). The symbol equations may NOT be numerically balanced. ... (1) C + O2 ==> CO2 ... (2) CO2 + C ==> CO ... (3) Fe2O3 + CO ==> Fe + CO2 ... (4) CaCO3 + SiO2 ==> CaSiO3 + CO2 Which statement is TRUE? |
![]() | Stages in the extraction of iron in a blast furnace are described below after iron ore, coke and limestone have been added at the top, but not in the correct order. (1) carbon dioxide reacts with coke (carbon) to form carbon monoxide (2) limestone combines with acid impurities (3) hot air is blown into the furnace (4) carbon monoxide reacts with iron oxide to make iron (5) coke (carbon) burns to form carbon dioxide Which is the correct order of sequence for (1) to (5)? [me-86] |
![]() | In the extraction of aluminium by electrolysis of molten aluminium oxide, all the chemical changes occur on the surface of the electrodes. The formula for aluminium oxide is Al2O3. Which is the correct equation to show the change at the negative electrode? [me-43] |
![]() | In the extraction of aluminium by electrolysis of molten aluminium oxide, all the chemical changes occur on the surface of the electrodes. The formula for aluminium oxide is Al2O3. Which is the correct equation to show the change at the positive electrode? [me-44] |
![]() | In the extraction of aluminium by electrolysis of molten aluminium oxide, all the chemical changes occur on the surface of the electrodes. The formula for aluminium oxide is Al2O3. Which word describes the process happening on the surface of the positive electrode? [me-45] |
![]() | In the extraction of aluminium by electrolysis of molten aluminium oxide, all the chemical changes occur on the surface of the electrodes. The formula for aluminium oxide is Al2O3. Which word describes the process happening on the surface of the negative electrode? [me-46] |
![]() | Copper is purified by the electrolysis of copper(II) sulfate solution using copper electrodes. All the chemical changes occur on the surface of the electrodes. The formula for copper(II) sulfate is CuSO4. Which word describes the process happening on the surface of the positive electrode? [me-47] |
![]() | Copper is purified by the electrolysis of copper(II) sulfate solution using copper electrodes. All the chemical changes occur on the surface of the electrodes. The formula for copper(II) sulfate is CuSO4. Which word describes the process happening on the surface of the negative electrode? [me-48] |
![]() | Copper is purified by the electrolysis of copper(II) sulfate solution using copper electrodes. All the chemical changes occur on the surface of the electrodes. The formula for copper(II) sulfate is CuSO4. Which equation correctly describes the process happening on the surface of the positive electrode? [me-49] |
![]() | Copper is purified by the electrolysis of copper(II) sulfate solution using copper electrodes. All the chemical changes occur on the surface of the electrodes. The formula for copper(II) sulfate is CuSO4. Which equation correctly describes the process happening on the surface of the negative electrode? [me-50] |