KitKatKrunchy
28.09.2019 •
Physics
What effect does an energy change have on the identity of a substance?
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Ответ:
an example of physical change is water being cooled and then heated. there is no change in the tetrahedral geometry of individual water molecules. so its identity is preserved. other examples include breaking glass, cutting wood, melting ice, and magnetizing a piece of metal.
now coming to the chemical changes, they are always accompanied by energy changes. if the energy released by the the reactants, the process is exothermic, i.e, the released energy exceeds the activation energy. conversely, if the energy is needed by the reactants to be converted into products, this process is known as endothermic.
Ответ:
u... ok