Is anyone here a good Chemist

[Maple]

Hey, I kind of have a Lab Report to do for tomorrow and I've no idea how, its something about Enthalpy

here is what I have to do: Conclusion about the hypotheses , resume of the obtainted results that I got from all the labs I did. Explication about Endothermic and Exothermic, utility of metals in function of their thermal capacity, role of the nature of the substances in the xchange of heat. link between the thermal capacity and thermal conductivity, and application of Hess law

Results:

Initial Final Variation Exo Endo

NH4Cl 21.7 18.4 -3.3 x

CaCl2 21.1 28.2 7.1 x

NaCO3 21.8 24.6 2.7 x

I just cant understand ^^

Edited February 1, 2016 by Maple 1st MRB

[C. Thompson]

if i remeber my college classes correctly. thats a form of mesuremtn when dealing when energy and if im correct thermodynamic energy in particular.

[Quarterman 1st MRB]

My chemistry goes as far as mixing Coke with Spiced Rum. I hope that was helpful Good luck Maple!

[Lafy BAR]

I don't really know anything about this, but you don't seem to be providing enough information. You seem to be saying that for a particular molecule (reactant or product?) the temperature before and after a reaction were such and such, the change is final - initial, and then you've written x a bunch of times for... an unknown reason. What are the actual reactions you were measuring? How did you come up with your initial and final temperatures? What were your reactants and products? Any of this info might help figure out the answer (although i'm not sure it'll be me that can help since I just flipped through a page about hess law online and am guessing)