Chemistry Energy Changes

exothermic

transfer of energy to the surroundings so that temperature rises e.g. combostions or self-heating cans

endothermic

reaction that takes in energy from the surrounding so temperature drops e.g. thermal decomposition and some sports injury packs

reaction profiles

chemical reactions refers to the energy and how many times molecule collide.

reaction profiles are graphs that show the activation energy and the energy change between the reation of a reactant to a product

endothermic = increase to decrease and exothermic = decrease to increase.

activation energy

activation energy = min energy required for molecules to react

energy change of reations

energy must be supplied to break bonds and released to form bonds

Sum of energy taken in to break bonds – sum of energy released to form bonds = overall energy change

the breakage of bonds = endothermic and the formage of bonds = exothermic