n a cryogenic experiment, oxygen gas is confined to a 2-dimensional surface at a temperature of 60 K. The oxygen molecule can rotate in the plane of the 2-dimensional surface but not in any other orientation. If the oxygen gas absorbs into the gas phase from the surface at the standard boiling point of oxygen, which is 90 K, how much energy is required to heat 1 micromole (10-6 mol) to the desorption temperature

Answer is in the photo. I couldn't attach it here, but uploaded it to a file hosting. link below! Good Luck!

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answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.