5 marks (i) When an iron nails was added to a solution of copper sulphate,the colour of the solution changed from blue to light green and a red colour substance was deposited on the nail. However when silver was added to the copper sulphate solution , then no change was observed in the colour of the solution.explain.
(ii) What is a redox reaction ?when a magnesium ribbon burns with a air in dazzling flame is it oxidized and reduced
Answers
Answer:
Explanation:
When an iron nail immersed in the solution of copper sulphate than iron displaces copper from the solution of copper sulphate because iron is more reactive than copper. Therefore copper sulphate solution colour changes from blue to pale green.
Answer:
1)When an iron nail immersed in the solution of copper sulphate than iron displaces copper from the solution of copper sulphate because iron is more reactive than copper. Therefore copper sulphate solution colour changes from blue to pale green.
The reaction is
CuSO4 (aq) + Fe (s) → FeSO4 (aq) + Cu (s)
2)The reaction in which oxidation and reduction occur simultaneously is called a redox reduction.
when magnesium ribbon burns,it forms oxide magnesium is oxidised to its oxide.
Mg+1/2O²-> MgO