In this animation you will see the changes of state of a block of ice in an open container. Observe how the temperature varies and the values shown during the process. You can vary the power of the heater and see how it influences the time the whole process takes. The process of vapourization takes longer and you have to apply much more heat to evaporate all the water than to melt all the ice (the mass of the water and the ice are the same).
Copy the diagram into your exercise book and write down your observations. Notice that the steam bubbles form (in a much greater number than those seen on the animation) inside the liquid and burst when they reach the air. 

To see this topic in greater depth you can go to  this one (4th year of secondary education).