In reaction A, the stability of the substrate is less than the stability of the product. The free energy change, ΔG, of the reaction is negative, so the reaction is considered exergonic and spontaneous. In reaction B, the stability of the substrate is greater than the stability of the product. The free energy change, ΔG, of the reaction is positive, so the reaction is considered endergonic and not spontaneous.

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.

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.

the answer is 75.0%.

i'm wiling to try and you : )