1. Hydrogen peroxide is stored in a dark, opaque container because, at room temperature, it spontaneously forms water and oxygen in the presence of light. Even if exposure to light is minimal, hydrogen peroxide will break down over time, giving it a limited shelf life. a. What can you infer about the relative thermodynamic and kinetic stability of hydrogen peroxide?

b. What role does light play in the decomposition of hydrogen peroxide?

c. If manganese dioxide is added to hydrogen peroxide, bubbles of gas are produced immediately, but the MnO2 is not changed in the reaction. What can you conclude about the role of manganese dioxide and its effect on the activation energy in the decomposition reaction?

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.