Question

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Answer 1

Answer:

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Explanation:

(1) Chemical change

Reaction between copper sulphate and iron nail :

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.

Reaction

CuSO4 (aq) + Fe (s) → FeSO4 (aq) + Cu (s)

In this reaction following two processes take place:

Cu²⁺ + 2e = Cu⁰ (re­duc­tion process, Cu²⁺ is the ox­i­dizing agent)

Fe⁰ – 2e = Fe²⁺ (ox­i­da­tion process, Fe⁰ is the re­duc­ing agent)

The reaction can be double displacement reaction as well as redox reaction (oxidation and reduction both takes place simultaneously).

Explanation

When an iron nail is dipped in copper sulphate solution, a brown coating of copper is formed in the surface of iron and the colour of copper sulphate solution changes from blue to pale green. The reaction shows that iron is more reactive than copper because it displaces copper from the copper sulphate solution. The iron passes into the solution as Fe (II) forming the ferrous sulphate solution.

(2) Chemical Change

Burning of magnesium ribbon

The burning magnesium ribbon produces light of sufficient intensity to cause temporary loss of sight. Avoid looking directly at the light source. The burning of magnesium in air produces intense heat which can cause burns and initiate combustion in flammable materials.

The equation is: Magnesium + oxygen → magnesium oxide. 2Mg + O2 → 2MgO.

(3) Chemical change

Reaction between baking soda and vinegar :

When baking soda is mixed with vinegar, something new is formed. The mixture quickly foams up with carbon dioxide gas. If enough vinegar is used, all of the baking soda can be made to react and disappear into the vinegar solution. ... Sodium bicarbonate and acetic acid reacts to carbon dioxide, water and sodium acetate.

NaHCO3 + HC2H3O2 - Baking Soda and Vinegar

(4) Chemical Change

Breakdown of silver chloride in the presence of sunlight :

Decomposition of silver chloride takes place in the presence of sunlight. In this reaction, the white colour of silver chloride changes greyish white due to the formation of silver metal.