When copper is heated in a flame, it turns black with a coating of copper (II) oxide.
Copper+ oxygen --> copper(II) oxide
2- This is an example of thermal decomposition. Copper (II) oxide is a base- it reacts with acids to form salts.
Base+ acid--> salt + water
Copper(II) sulphate + nitric acid--> copper nitrate + water
3- The formation of the deep blue complex ion with ammonia is used as a test for the presence of copper in solution. Other metals give green-blue solutions for example nickel or cobalt, but only copper forms this colored complex.
Here, ammonia (NH3) is added to copper(II) sulpate (CuSO4). The result is a pale blue precipitate, which is Cu(OH)2.
NH3 Add more the product is
(Cu(H20)2 (NH3)4 ) 2+ )
Iron(II) chloride Green
Iron(III) chloride Brown
Copper sulphate Blue
Copper carbonate Blue green
Copper oxide Black
Copper nitrate Blue
Copper chloride Green
Fe + Hcl--> Fecl2
Cuo + Hcl --> Cucl2 + H2o
Cu + Hno3--> Cu(No3)2 + H2o + No2
- POLYMERS- NOTES
- periodic table - groups -notes
- analysis - NOTES/ flame test
- PURIFICATION AND USES OF COPPER
- electrolysis of sodium chloride
- electrolysis of lead bromide-notes
- oxidation and reduction- notes
- electrolysis- notes
- summary non metals- notes
- Experiment to show the % of oxygen in air- notes
- Composition of gases in air - notes
- preparation of hydrogen- notes
- sulphur- notes
- ammomium salts- notes
- ammonia-notes/IGCSE /GCSE -CHEMISTRY
- test for carbondioxide- notes
- properties and uses of carbondioxide - notes/IGCSE...
- preparation of carbondioxide- notes/IGCSE /GCSE/CH...
- formation of oxides- Notes
- reactions of copper- notes/ IGCSE / GCSE
- reactions of iron-igcse /gcse notes
- atomic structure - work sheet
- ▼ October (22)