eggy/eifueo
1
1
Fork 1
Code Issues 2 Pull Requests Releases Wiki Activity

chem: Add enthalpy cycles

Browse Source
This commit is contained in:
eggy 2021-09-20 18:19:41 -04:00
parent c4095be80a
commit 15547a0b85
1 changed files with 11 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
docs/sch4uz.md
View File

@ -135,6 +135,17 @@ A **formation equation** is a balanced chemical equation where exactly one mole
The **standard enthalpy of formation** $\Delta H^\theta_f is the energy change from the formation of one mole of its substance from its elements in their standard states. It can be determined by subtracting the sum of the enthalpy of each element/compound on the reactant side and adding those on the product side.
$$\Delta H = \sum n\Delta H\text{ products} - \sum n\Delta H\text{ reactants}$$
!!! warning
It is assumed that there is no state change that would affect enthalpy when calculating *standard* enthalpy of formation.
### Enthalpy cycles
Enthalpy cycles are a visual representation of Hess's law. It is used to show that the energy is the same from initial reactants to a product regardless of any intermediate steps.
!!! example
$\Delta H_1 = \Delta H_2 + \Delta H_3$. Note that both arrows point to the intermediate product.
<img src="/resources/images/enthalpy-cycles.png" width=700>(Source: Kognity)</img>
## Resources
- [IB Chemistry Data Booklet](/resources/g11/ib-chemistry-data-booklet.pdf)