A list of five metals is shown. Most Group II metals form a gas when placed into cold water. An alkaline solution is also formed. (i) Name the gas formed when strontium is added to cold water. ................................................................................................................................... (ii) Name the alkaline solution formed when strontium is added to cold water. ................................................................................................................................... (iii) One Group II metal reacts very slowly when placed in cold water. When heated, the metal reacts with steam to form a white solid. Identify this metal and name the white solid formed. metal ............................................................................................................................... white solid .......................................................................................................................

Chemistry

IGCSE&ALevel

CAIE

Exam No：0620_s24_qp_42 Year：2024 Question No：2(c)

Answer:

9.6.1. Describe the ease in obtaining metals from their ores, related to the position of the metal in the reactivity series

9.6.2.1. the burning of carbon (coke) to provide heat and produce carbon dioxide

9.6.2.2. the reduction of carbon dioxide to carbon monoxide

9.6.2.3. the reduction of iron(III) oxide by carbon monoxide

9.6.2.4. the thermal decomposition of calcium carbonate / limestone to produce calcium oxide

9.6.2.5. the formation of slag Symbol equations are not required

9.6.3. State that the main ore of aluminium is bauxite and that aluminium is extracted by electrolysis

9.6.4.1.

9.6.4.2.

9.6.4.3.

9.6.4.4.

9.6.4.5.

9.6.5.1. the role of cryolite

9.6.5.2. why the carbon anodes need to be regularly replaced

9.6.5.3. the reactions at the electrodes, including ionic half-equations

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