Measuring how energy changes during reactions can be tricky. This is because things like heat loss, temperature mistakes, and needing very accurate measurements can all cause problems.

Here are two methods used to measure these changes:

1. Calorimetry:

   • Basic calorimeters might not keep the reaction completely isolated.
   • More advanced methods can help reduce mistakes.

2. Differential Scanning Calorimetry (DSC):

   • This method needs costly equipment.
   • If it's properly adjusted, it can reduce errors.

In short, being careful about how we do these experiments is really important for getting accurate results.