Q17 of 22 Page 17

Suppose that 1l of water is heated for a certain time to rise and its temperature by 2oC. If 2l of water is heated for the same time, by how much will its temperature rise? (AS7)

We know that: -

Q = mS∆T


⇒ ∆T =


⇒∆T is inversely proportional to the heat supplied.


⇒If the mass is greater than we get a change in temperature for the same amount of heat supplied.


Given the change in temperature when 1l(m1) of water is heated for a certain time = ∆T1 = 2oC


Let the change in temperature when 2l(m2) of water is heated for a certain time be ∆T2


Heat supplies and specific heat is constant for both the cases.


∴


⇒


⇒ ∆T2 =


⇒∆T2 = 1 oC


Hence, if 2l of water is heated for the same time then 1 of temperature rise will take place.


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