At STP, a 12.0-liter sample of CH4(g) has the same total number of molecules as
A) 6.0 L of H2(g) at STP
B) 12.0 L of CO2(g) at STP
C) 18.0 L of HCl(g) at STP
D) 24.0 L of O2(g) at STP

Supongamos que estás estudiando dos estrellas. ambas estrellas tienen la misma magnitud aparente, pero la estrella a tiene una magnitud absoluta mayor que la estrella b. ¿que puedes decir acerca de la distancia a la tierra de estas dos estrellas?

What are the similarities of physical and chemical change ?

An electron moved from shell n = 2 to shell n = 1. what most likely happened during the transition? a fraction of a photon was added. a photon of energy was absorbed. a fraction of a photon was removed. a photon of energy was released.