Hydrogen (essentially a proton-proton reaction)
The nitrogen base tri-phosphates (like ATP, GTP etc) and NADPH produced during the Light reaction provide the energy for the Dark reaction.
NADPH and ATP are produced by the light reactions. The ATP is a high energy molecule produced by photophosphorylation while the NADPH is produced at the end of the electron transport chain.
A reaction is endergonic when it requires a net input of energy; if the products contain more energy than the reactants. So, no an endergonic reaction takes in energy. An exergonic reaction releases energy. In an exergonic reaction, the reactants contain more energy than the products.
The amount of heat produced in a reaction is not fixed. It depends upon the total amount of energy change that has taken place in the reaction altogether. Not only this, all reactions do not produce heat. In some cases we have to supply energy from external sources to get the reaction started.
the energy produced by the reaction.
Wind energy.
Energy is produced in batteries due to chemical reaction.
This shows that the reaction is endothermic because energy is absorbed in the reaction and not produced.
The energy needed to start a chemical reaction is called the activation energy :)
The Activation Energy.
Chemists call the energy needed to get a reaction started the activation energy. This energy is required to break the bonds of the reactant molecules before they can form new bonds and produce products.
Hydrogen (essentially a proton-proton reaction)
A exeothermic reaction
The enthalpy of reaction
In a nuclear reaction, a small amount of mass is converted into energy according to Einstein's famous equation, E=mc^2. The energy released is in the form of electromagnetic radiation, such as gamma rays, and the kinetic energy of the particles produced in the reaction.
The nitrogen base tri-phosphates (like ATP, GTP etc) and NADPH produced during the Light reaction provide the energy for the Dark reaction.