Consider the decomposition of water, is energy released or absorbed in this reaction? Discuss bond energy in your answer.!

Then decomposition of water involves its breakdown into Hydrogen and Oxygen

The energy derived is absorbed which means it’s an endothermic reaction. If the energy is released to the surroundings/environment, it is termed as exothermic.

In an endothermic reactions, the reaction occurs when the bonds present in the reactants are broken and greater than the release of new bonds during products formation.

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !