Q. Sara took some ice in a beaker and heated it. She recorded the changes in temperature using a
thermometer and had the following observations:

Time (in min.). Temp. (in C)
0 .-3
1 .-1
2 .0
3 .0
4 .5
5 .8
6 .12
7 .15
8 .19
10 .22
15 .30
20 .50
25 .73
30 .100
35 .100

Based on the above observations, answer the following questions:

a. State the change observed between 2-3 minutes and name the process involved.

b. The temperature remains constant between 30-35 min, what could be the reason for this? Name the heat involved in this process and define it.