a small piece of sodium is dropped into a beaker of water give two Reason by this reaction involves a chemical change
Answers
Answer:
When sodium comes in contact with water, hydrogen gas is liberated and sodium hydroxide is generated that dissolved in the water.The reaction is strongly exothermic, and the heat generated ignites the hydrogen gas. A small piece of sodium will will burst on the surface of water with a hydrogen flame under and around it.
Sodium metal reacts rapidly with water to form a colorless basic solution of sodium hydroxide (NaOH) and hydrogen gas (H2).
Explanation:
(i) When sodium metal is dropped in water, an exothermic reaction occurs due to which the evolved hydrogen gas catches fire.
2Na(s)+2H
2
O(l)→2NaOH(aq)+H
2
(ii) sodium metal is heated in free supply of air to form sodium peroxide and sodium oxide.
2Na(s)+O
2
(g)→Na
2
O(s) minor product
Na
2
O
2
(s)+2H
2
O(l)→2NaOH(aq)+H
2
O
2
(l)
(iii) sodium peroxide dissolves in water to form hydrogen peroxide.
Na
2
O
2
(s)+2H
2
O(l)→2NaOH(aq)+H
2
O
2
(l)