Can scientific ideas ever change?

Yes scientific ideas can change...That's why they are called ideas so it may be right or wrong... ideas are just guesses that you consider may work or not I hope this helps you

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.

c (diamond),

sio2 (quartz)