Prelim Dot-point Help- Water calorimeter (1 Viewer)

[chocolatelatte]

Hi guys! I'm unsure as to how to answer this dot-point.
2. Explain how water's ability to absorb heat is used to measure energy changes in chemical reactions
I get that water is used in calorimeters but I can't seem to elaborate any further than that.

And assessing the limitations of calorimeters, is their limitation just that it has to be a closed system....


THANKS!!