Base your answers to questions 57 and 59 on the information below and on
your knowledge of chemistry.
A sample of a substance is a liquid at 65°C. The sample
is heated uniformly to 125°C. The heating curve for the sample at
standard pressure is shown below.
58 Determine the boiling point of the sample at standard
59 State what happens to the potential energy of the
particles of the sample during time interval BC. 
Answer--> Potential Energy Increases