Reaction Enthalpy vs Formation Enthalpy??

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KNguyen_1I
Posts: 101
Joined: Sat Aug 17, 2019 12:16 am

Reaction Enthalpy vs Formation Enthalpy??

Postby KNguyen_1I » Sat Jan 25, 2020 8:14 pm

There are a lot of terms being thrown around, and I can't keep all this vocabulary straight. Can someone lay out all the terms we have in the enthalpy unit so far and what they refer to?

PranaviKolla2B
Posts: 114
Joined: Fri Aug 30, 2019 12:17 am

Re: Reaction Enthalpy vs Formation Enthalpy??

Postby PranaviKolla2B » Sat Jan 25, 2020 8:40 pm

Can someone do the same with all the equations regarding enthalpy and entropy?

CMaduno_1L
Posts: 102
Joined: Wed Sep 18, 2019 12:18 am

Re: Reaction Enthalpy vs Formation Enthalpy??

Postby CMaduno_1L » Sun Jan 26, 2020 8:37 am

I'm not too sure about entropy, but some of the enthalpy unit terms we have are:
enthalpy itself, which refers to the study of heat released or absorbed in chemical reins and physical changes...it can also refer to the amount of heat released or absorbed at a constant rate

if reaction gives a net release of heat: exothermic
...requires heat: endothermic

state property: only the final and initial state are important in determining the current state (the path to get there is not considered)
vaporization: liquid --> vapor
melting(or fusion): solid --> liquid
sublimation: solid --> vapor
condensation: gas --> liquid
standard enthalpy of formation of an element: an element's enthalpy when it is in its most stable form (equal to 0)

I believe that standard enthalpies of reaction refer to the enthalpies when elements are bonded and not standing on their own? Not too sure, could someone please confirm?

Hope this is helpful


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