1. How much faster does the solid matter heats up (the line from 20C towards 60C) than when the solid matter is now a substance and heats up (the line from 60C towards 108C)?
Sorry for the poor use of language, I'm dutch so I kind of have a hard time translating haha.
2. And also, how would the graph look like if the matter isn't 1 kilo (like it is now), but when it is 2 kilo?
Thanks in advance!
1. The solid heats up by 40 degC in 5 minutes, so that's 8 degC/minute
The liquid heats up by 48 degC in (21.6 - 12) minutes, so that's 5 degC/minute.
(I've assumed that by "substance" you are referring to the totally liquid phase).
2. If the same rate of heat input is used then for twice the material, the positive slopes for the solid and liquid phases will be half what they are now, and the horizontal, two-phase section will be twice as long. So the solid line will go from 20 C at 0 minutes to 60 C at 10 minutes. The horizontal line will stretch from 10 minutes to 24 minutes. The liquid line will go from 60 degC at 24 minutes to 108 degC at ... minutes. (I'll leave you to work out the ... time).