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14. The graph below shows the variation of temperature with time that occurs when a
solid is heated. Study it carefully and answer the following questions.
E
С
Temp
B
A
5 Time
a) What states are represented by the region A, C and E?
b) What processes are represented by the two horizontal sections B and D?
c) Explain why during these horizontal periods (B and D), the input of energy does not
produce any increase in the temperature.
d) When the same amount of another substance was used under identical conditions, the
length of time needed for process D to occur was much shorter. What can you deduce from
this?
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Answer 1

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