Question

Write the chemical equation of the reaction in which the following changes have taken place . Which an example of each. Change in temperature, change in color, formation of precipitate

Answer 1

the chemical equation of the reaction in which the following changes have taken place.

1) Change in temperature
Zn + H2SO4 ---- ZnSO4 + H2 + Heat

2) Change in colour
CuSO4 + Fe ---- FeSO4 + Cu
(blue) (black) (green) (reddish brown)

3) formation of precipitate
Na2SO4 + BaCl2 ---- 2NaCl + BaSO4

BaSO4 is white precipitate.

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Answer 2

Answer:

1. Change in colour :

The reaction between lead nitrate solution and poassium iodide solution.

Chemical equation as follow :

Pb ( NO₃ )₂ + 2 KI  ⇒  PbI₂ + 2 KNO₃

In above reaction colour change from colourless to yellow.

2. Change in temperature :

The reaction between dil. sulphuric acid on zinc.

Chemically :

Zn + H₂SO₄  ⇒  ZnSO₄ + H₂

Heat evolved in the above reaction.

3. Formation of precipitation​ :

The reaction between barium chloride on sodium sulphate.

Chemically :

BaCl₂ + Na₂SO₄  ⇒  BaSO₄ + 2 NaCl

In the above reaction white ppt. of BaSO₄ will form.