Jagadeesh saw 10 grams of unknowns substance in a beaker. He pour water in the beaker. The beaker was heated up. What could be the unknown substance ? Guess the reaction.

Sohan took an unknown matter in to a beaker. The matter took the shape of the beaker. Later he transferred the matter into a measuring cylinder. The matter took the shape of the container but its volume remained the same. What is the state of that matter?

Aim: To study the reaction between calcium oxide and water. Activity: Take some quick lime (Calcium oxide - CaO) in a beaker. Add water to it slowly. Touch the beaker as shown in the figure 1.3. What is formed by reaction of quick lime with water ? Write reaction.

If a beaker holds 576g of water, what will be the gram molecules of water in that beaker ?

Practice problems : Substances P and Q having specific heats in the ratio 2:3 and masses in ratio 1:2 are taken in two identical beakers . When the beakers are supplied equal amount of heat , temperature of the substance P increses by 60 ⁰C . determine the change in the temperature for substance Q .

Aim: To study the reaction between calcium oxide and water. Activity: Take some quick lime (Calcium oxide - CaO) in a beaker. Add water to it slowly. Touch the beaker as shown in the figure 1.3. What do you feel by touching the beaker outside ?