Una mezcla de 100kg de gas cuyo análisis Orsat es el siguiente: 6.4% de CO2, 0.2% de O2, 40% de CO, y 50.8 % de H2 (el resto es N2), se quema con 40% de aire en exceso en un horno. ¿Qué composición porcentual tiene el gas de chimenea?

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.

po-215 i got it right on the quiz