Question

I have two questions on my review study guide that go like this:

1) What is the equation for calculating the energy change that occurs when a substance changes state?

2) What is the equation for calculating the energy change that occurs when a substance increases in temperature?


Wouldn't they both use the same equation, q = mcÄT?

Answer 1

That's supposed to be q = mc(delta)T

Answer 2

change of temperature is correct at q = mc(delta)T. But the equation for changing state is
q = mass x heat fusion for melting (change from solid to liquid state).
q = mass x heat vaporization for boiling (change from liquid to vapor state).

Answer 3

Ohhhh I see now! Thanks so much!! :)