ZIMSEC A-Level Chemistry
6.4.1.7Cobalt and nickel
Cobalt and nickel in ZIMSEC A-Level Chemistry: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic23 practice questions1 lesson
Learning objectives
What the syllabus expects you to be able to do.
- 6.4.1.7.1Describe the occurrence, relative stability and colours of cobalt ions and compounds in the +2 and +3 oxidation states.
- 6.4.1.7.2Explain the effect of ligands and temperature on the stability and geometry of cobalt complexes ([Co(H₂O)₆]²⁺, [CoCl₄]²⁻, [Co(NH₃)₆]²⁺, [Co(NH₃)₆]³⁺).
- 6.4.1.7.3Explain the uses of cobalt in alloys, of anhydrous cobalt(II) ions as a test for water, and its biochemical importance.
- 6.4.1.7.4Describe the occurrence, production and purification of nickel from its sulfide ore, and its uses in alloys and as a hydrogenation catalyst.
Lessons
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Cobalt and nickel and their compounds
45 min
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Sample question
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Turn Cobalt and nickel into a strength.
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