Question

How does changing the heating time affect the amount of heat added?

Answer 1

We know that

Q= mc (T₂ - T₁)

where Q = heat energy in Joules

m = mass of the substance

c = specific heat capacity of the substance

delta T =change in initial and final temperature

Case a:

Now, if we tend to increase the heating time,

i.e heat the substance for a longer time then the difference between the initial and the final temperature will be more which will lead to higher heat energy.

Case b:

Also, suppose if providing the heat at a constant Temperature for a longer duration then the heat energy that is being absorbed by the substance will keep on increasing the kinetic energy of the constituent molecules and can lead to change in phase of the substance.

For example the sublimation reactions or any other reactions which result in the change of the substance from Solid or Liquid into some different state of existence.

Case c: If the heating time is reduced then the overall absorbed energy will be lowered.