The activation energy needed for a reaction to occur is the distance between the top of the hill and where the reactants start. So if you were to read the y-axis at the top of the hill and read the y-axis where the reactants start, all you have to do is subtract those numbers to find the activation energy. If the top of the hill was at 100J and the reactants started at 60J, what would the activation energy be?

have a great day because if you dont you and i will be sad

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.