Question

Bond Energy and thermal Energy question

Answer 1

Why is that Energy bond calculated as adding Eth of water and iron together?

(I understand why the bond energy is positive because the energy bond of water is increasing due to phase change from solid to liquid)

Answer 2

@Astrophysics @inkyvoyd

Answer 3

@IrishBoy123

Answer 4

I'm guessing here, that the encl pptx matches the question ... for reasons of running round in circles, I'm not sure. If it does, then the q looks like a "method of mixtures" question from, roughly, UK O level physics ? Problem is that there are bits missing - the (specific possibly) heat capacties of Fe and H20 and things like that.
wooo hooooo .
http://perendis.webs.com

Answer 5

I can't as such see any CHEMICAL reactions happening, 'cos I don't know how fast iron rusts, nor have any real idea of the time scale of the question's scenario. If I've made a word of sense ? That suggests to me that it's a conservation of thermal energy (ADIABATIC) in thermodynamics terms - thermally insulated so that heat energy doesn't enter nor leave the container, and the container gets to thermal equilibrium when ALL the contents are at the same temperature. Rather sweet, really, for a lump of iron to share its heat energy ! (sorry about the humour)

Answer 6

Initially there was some ice and some water. Recall that ice needs some energy to break its bonds as it changes its phase.(latent heat)

Here we use conservation of energy :
Heat released by solid Iron = Heat absorbed by H20.

Answer 7

As the solid iron's temperature changes from 200C to 25C,
23,625 J of heat flows out from the solid Iron. This is the only heat source available for the H20 to absorb.

20,900 J of the heat that was released from the solid Iron was absorbed by the liquid water(after melting).
The remaining 2725 J was used to melt 8.2g of the solid ice.

Answer 8

Heat released by solid Iron = Heat absorbed by H20.
23,625 = 20,900 + 2725