Is rust on a bike a physical or chemical change?

there all right good

explanation:

? you expect us to answer this? ? this is your schoolwork, i don't think we can with this, i think it would considering being

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.