This time its for more points ;D can someone help remind me how to balance chemical equations with an example!

To balance chemical equations, think of both sides as a balance that can totter. When one side is heavier it falls and the other rises. The Chemical equation is the same thing: When the equation is balanced, neither the identities nor the mass of both the reactants and the products remain unchanged.

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.