Tenemos una botella de 500 cm3 de disolución de KCl (C= 35 g/l) y añadimos 250 cm3 de agua. ¿cuál será ahora la concentración de la nueva disolución?

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.

the dependant variable is spilled water

the independent is the heat