11. Use the heating curve at right to answer the following questions: 140 a. Wha

Question

11. Use the heating curve at right to answer the following questions: 140 a. What is going on in the segment marked A? 1001 . C. 2 80 60 40 20 b. What is going on in the segment marked B? c. What is going on in the segment marked C? Heat added at a constant rate d. What is going on in the segment marked D? c. What is going on in the segment marked E? f What is the boiling temperature of the substance? g. What is the melting temperature of the substance? h. What do you need to know to calculate the heat required for segment C? i. What do you need to know to calculate the heat required for segment B?

Explanation / Answer

Q11

a)

this is heating of solid, it is icnreasing its energy via addition of heat, and also, increase of temperature

b)

this is latent heat, it is melting, it goes from solid to liquid

c)

this is heating of liquid, i.e. changes from Tmelting to Tvapor

d)

d is latent heat of vaporization, it is the energy reuqired to convert it theo liquid to gas

e)

finally, this is heating (ikncrease of temperature) of gas

f)

Tb from the list must be the T = D

it is a130- 135°C approx

g)

Tmelting -- B

this is approx T = 40°C

h)

for C --> mass of liquid, specific heat of liquid

i)

we nede to know mass of solid, heat of fussion

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