Question

Design a test-tube experiment which will show that manganese is more reactive than copper. In your answer you must include a clear hypothesis with scientific justification and detailed procedure.

Answer 1

Answer:

Take 2 test tubes A and B

In test tube A : React Manganese with Hydrochloric acid

Reaction - Mn+H2SO4 = MnSO4 + H2

This mean that Manganese is more reactive than Hydrogen

In Test tube B :. React copper with hydrochloric acid

reaction - Cu+H2SO4 = No reaction

This mean that Copper is less reactive than Hydrogen

Therefore , Mn>H>Cu i.e Mn>Cu

Answer 2

Hypothesis: Displacement reaction determines the reactivity of manganese over copper.

• Procedure: In displacement reaction, the highly reactive metal will displace other metals present in the compound to form a new compound.
• Take magnesium salt and introduce it into the solution of copper.
• The magnesium salt will dissolve into the solution and the copper present in the solution will coat the surface of the metal.
• Therefore, the blue color solution will turn colorless due to the presence of magnesium and the copper becomes powder.
• The equation for the above reaction is :

                                   Mg + CuSO₄ → MgSO₄ + Cu

• If the reaction is reversed, the reaction won't occur because the reactivity of copper is lesser than the of magnesium.