Consider two solutes with the same lattice energy in kj/mol; however, the particles of solute a are strongly solvated by water, while those of solute b are only weakly solvated. Which of the two dissolution processes is more exothermic, on a kj/mol basis?.

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.

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