A certain substance is enclosed in a container and the temperature is monitored

Question

A certain substance is enclosed in a container and the temperature is monitored as a function of time as shown in the figure at right. Heat is added to the container at a constant rate. For each straight line segment in the graph, explain what is happening to the material in the container. Use locators like a->b, etc for each segment. Which is greater for this substance, the latent heat of vaporization or the latent heat of fusion? Explain using locators like a->b, etc. for each segment considered. Compare the specific heats of the gas, liquid, and solid phases for this substance. (Explain using locators like a->b, etc for each segment considered).

Explanation / Answer

a) from a->b the heat added rises the temperature of the substance and the substance reaches its melting point which is "b" then from b->c all the solid is melted into liquid by taking the latent heat of fusion, here the temperature remains constant as all the heat supplied is used to convert the solid into liquid then from c->d the heat added rises the temperature of the substance and the substance reaches its boiling point which is "d" then from d->e all the liquid is vaporized into gas by taking the latent heat of vaporization, here the temperature remains constant as all the heat supplied is used to convert the liquid into vapor then from e->f the further heat supplied rises the temperature of the vapor.. b) it is clear from the graph that b->c (latent heat of fusion) is greater than d->e (latent heat of vaporization) c) we know that greater the specific heat of the substance more easily it gains or loose the heat. therefore, specific heat is in the order a->b > c->d > e->f reason: we see that the slope of line a->b is more than the slope of the line c->d which is in turn more than the slope of line e->f, which means more heat is taken in less time i.e. more easily heat is added :) now rate me :)

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.