Question

write the chemical equation of the reason in which the following changes has taken place with an example of each: 1. change in colour
2.change in temperature 3.formation of precipitation ​

Answer 1

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

2. CaO (s) + H2O (l) → Ca(OH)2 (aq)

3. BaCl2 (aq) + Na2SO4 (aq) → 2NaCl (aq) + BaSO4 (ppt.)