Which answer below is not an indication that a chemical reaction has occurred?

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?

Harry lives in a city, and he has a lung condition known as asthma. on certain days, harry has to stay inside because pollutants in the air make it difficult for him to breathe. which of these pollution sources are nonpoint sources that might bother harry if he goes outside? choose the two that apply.

Gene expression control that occurs during the generation of rna is a. controlled at transcription b. control before transcription c. controlled after transcription d. controlled after translation