The graphs below show the temperature of two different substances (A) and (B) of
ID: 1531352 • Letter: T
Question
The graphs below show the temperature of two different substances (A) and (B) of equal mass. Heat is added to both at the same rate until they reach their respective boiling points. Which substance has the greater (a) melting point? (b) latent heat of fusion? (c) specific heat capacity in the solid phase? (d) specific heat capacity in the liquid phase? (e) boiling point? The graph below show the temperature of two different substances (A) and (B) of equal mass, Heat is added to both at the same rate until they reach their respective boiling points. Which substance has the greater melting point? latent heat of fusion? specific heat capacity in the solid phase? specific heat capacity in the liquid phase? boiling point? Try to add reasoning to your answers, I don't see how for (B) the latent heat of fusion is greater in substance B if the horizontal line is higher in substance A. Specific heat capacity in any phase should be greater for substances that have a lower slope value on the slanted lines. That is my understanding on this but l could be wrong.Explanation / Answer
a) Melting poin of B is greater because it has taken more time to change its state solid to liquid
b) The enthalpy of fusion of a substance, also known as (latent) heat of fusion, is the change in its enthalpyresulting from providing energy, typically heat, to a specific quantity of the substance to change its state from a solid to a liquid at constant pressure. So B has more latent heat of fusion
c) Specific heat capacity of A substance is greater because c = dQ/dT
d) Specific heat capacity of B substance is greater
e) Boiling point of substance A is greater because after change of state solid to liquid, more heat is provided to change to another state
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