Kerala Board Solutions for Chapter: Chemical Changes, Exercise 2: Exercise 2

Take two beakers and fill three-fourth of them with water. Drop a small piece of sodium in one beaker. Notice the formation of a gas by the vigorous reaction between sodium and water. After the reaction, add two drops of phenolphthalein in both the beakers. What do you observe? 
The presence of which substance is indicated by the colour change in the beaker to which sodium was added?

The alkali formed by the reaction of sodium with water is sodium hydroxide. Metals like sodium and potassium react vigorously with water to form hydrogen gas and the corresponding alkali. Write the reactants and products involved in the above reaction. Write down the chemical balanced equation for this reaction.