when a certain quantity of salt as solute was added to 100g of pure water at 25 degree celsius, the vapor reduced to one half of that of the pure solvent. If the vapor pressure of the water is 23.76mmHg, what is the amount in mole of the salt added?

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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