Question

5. The graph shows the cooling curve of a substance. At what stages specific
latent heat is released? *
Temperature/°C
D E
F G
Time/minutes
0
O A. CD and FG
O B. DE and EF
O C. EF and FG
D. DE and FG

Answer 1

Answer:BC represents the change of state from vapour to liquid. So this is the region during when latent heat of vaporization is required. During DE the change takes place from liquid to solid where latent heat of fusion is required. Since latent heat of fusion is less than the latent heat of vapourization. Therefore, DE is shorter than BC.

Explanation: