Identify an equation that describes some chemical process. Your equation should have at least two parameters, at least one of which should contribute in a non-linear way.
Here is an example of such an equation. This describes the spectroscopic signal during a pH titration.
y = (A-B)*(10^(pH-pK) / (1 + 10^(pH-pK) )) + B
where
A: the signal from the protonated form
B: the signal from the ionized form
pK: The pK of the reaction
pH:The independent variable
y: The dependent variable (measured signal).
y is linear in A and B, but non-linear with respect to pK
You can use this equation, but you will lose two points (out of 20) if you use it instead of some other equation