can you please give answers to these questions related to chemistry
Answers
Answer:
1)
a) Sodium: Na
b) Lanthanum: La
c) Calcium Hydroxide: Ca(OH₂)
2)
a) Fe + HCl → FeCl₂ + H₂
b) Ca(OH₂) + HNO₃ → Ca(NO₃)₂ + H₂O
3)
a) Sodium Hydroxide: NaOH and Hydrogen gas: H₂
b) Sodium sulphate: Na₂SO₄ , Carbondioxide: CO₂ and Water: H₂O
4)
a) The blue colour of copper sulphate will gradually disappear and at the end of the reaction, the solution will attain a pale green colour due to the formation of Ferrous ion. Copper metal will be deposited as a red or red-brown precipitate.
Fe+CuSO4=======>FeSO4 +Cu
b) When we add water to the quick lime, a slaked lime kind of suspension is formed.
While touching the beaker, we feel the heat.
When the suspension of the slaked lime settles down at the bottom of the speaker, a clear solution is formed.
On blowing the exhaled air, carbon dioxide reacts with the clear solution and the lime water turns milky.
CaO (s) + H2O → Ca(OH₂) + Heat