Conventions: The
BestChoice module uses slightly different symbolism to indicate particular types of enthalpy or free energy changes than was used in your lectures in that the subscript is directly after the Δ as shown below.
| | lectures | BestChoice |
| enthalpy of formation | ΔHf | ΔfH |
| free energy of formation | ΔGf | ΔfG |
| enthalpy of reaction | ΔH | ΔrH |
Practice BestChoice problems:If you wish to do a practice problem in
BestChoice before doing the one in the assignment.
For Thermodynamics, there are some that are comparable under the
Enthalpy and Energy, Entropy and
Free Energy sections of the main menu. For Electrochemistry, see the corresponding section of the menu.
If you are looking for a particular type of problem, you can flick through the modules using the arrow keys near the header, or better still, complete the module. Those modules take on average 20 minutes to complete.
A few words of advice:
We suggest that you do calculations on pen and paper before entering the answers into
BestChoice.
Pay attention to the units associated with the numbers particularly in calculations involving Free Energy.
Note that some of the numbers that you calculate will have negative signs!!
BestChoice marks are sent back to the server when you leave the page. If you simply shut the browser window, it is possible that the last questions answered will not be submitted. These will be available for you to complete on a subsequent session.