Question

student took 2 3g of substance X in a glass beaker and poured water over it slowly.he observed bubbles along with hissing noise.the beaker become quit hot.identify X.what type of reactionis it is.

Answer 1

It is an exothermic reaction.And element X is calcium oxide .The reaction is following CaO+H2O-->

Ca(OH)2+Heat

Answer 2

Answer:

The reaction is exothermic.

Explanation:

• A reaction where the heat is given off is called an exothermic reaction. In such exothermic reactions, new bonds are formed.
• The substance X is probably calcium oxide. In this reaction, calcium hydroxide is formed when calcium oxide reacts with water. It is a combination reaction and it is exothermic as a lot of heat is given out.
• $CaO + H_2O$ → $Ca(OH)_2 +$ Δ
• Calcium oxide is also called a quick lime and calcium hydroxide is called slaked lime.