The following graph shows what happens to a solid when it was heated.

1.What is the melting point of this substance in degrees centigrade
Answer
2.Give a reason for the following shape of the graph A to B.
A.Increase in temperature as particles absorb heat energy.
B.Temperature remains constant as naphthalene melts heat absorbed.
C.Decrease in temperature as particles absorb heat energy.
Answer
3.Give a reason for the following shape of the graph B to C.
A.Temperature decreases as naphthalene melts heat absorbed.
B.Decrease in temperature as particles absorb heat energy.
C.Temperature remains constant as naphthalene melts heat absorbed.
Answer