Explain the following reaction with the help of balanced equation Calcium reacts with water
Answers
Answer:
Calcium reacts with water less vigorously to form calcium hydroxide and hydrogen gas.
b. Calcium starts floating in water as it becomes lighter due to the bubbles of hydrogen gas sticking to its surface.
Ca(s)+2H2O(s)→Ca(OH)2(aq)+H2(g)↑+small amount of heat energy
Answer :
- When calcium and water reacts hydrogen gas is evolved and calcium hydroxide is formed.
Explanation :
Calcium is a reactive metal, when water ( H₂O ) reacts with calcium ( Ca ) it reacts with forming bubbles, and releases hydrogen ( H₂ ) gas and calcium hydroxide is formed.
The word equation is :-
Calcium (s) + Water (aq) → Calcium hydroxide (aq) + Hydrogen (g) ↑
The balanced equation is :-
Ca + 2H₂O → Ca ( OH )₂ + H₂↑
Additional information
Reaction with water [ resulting hydrogen gas ]
Many reactive metals like potassium, sodium, calcium reacts with water to produce hydrogen.
For example ::-
- 2Na + 2H₂O (water) → 2NaOH + H₂↑
- 2K + 2H₂O (water) → 2NaOH + H₂
Reaction with steam [ resulting hydrogen gas ]
Some metals such as magnesium, zinc, iron react with steam to produce hydrogen gas.
For example ::-
- Mg + H₂O (steam) → MgO + H₂↑
- Zn + H₂O (steam) → ZnO + H₂↑
Reaction with dilute acid [ resulting hydrogen gas ]
Some metals like magnesium, zinc, iron, etc. react with dilute hydrochloric acid or dilute sulphuric acid to produce hydrogen gas.
For example ::-
- Zn + 2HCl → ZnCl₂ + H₂