is the understanding that the physical properties of objects, such as the number of items in a cluster or the amount of liquid in a glass, can remain the same even when their form or appearance changes.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

it's filtration, but this is an assumption so my apologies if i got this