How do I complete the following reactions?

All u have to do is write down the symbol of the reactant and the products first. Then u would have to balance them. Balancing is actually adding the coefficients to make the number of a the substances equal on both side of the reaction, i.e. before and after. Suppose in the given reaction, u have 2 sodiums(Na) reacting with 2 water(H20); u will have to add coefficients to the products as such that number of the Na, H and O's are the same on both sides.