Nitrogen dioxide, a pollutant that contributes to photochemical smog, is formed by a series of two reactions. N2(g)+O2(g)⇌2NO(g) Kc1=4.3×10−25 2NO(g)+O2(g)⇌2NO2(g) Kc2=6.4×109 N2(g)+2O2(g)⇌2NO2(g) Kc(overall)=? Choose the equilibrium constant expression for the overall reaction.

Which ocean zone has the most abundant primary producer and why a) the abyssopelagic zone ,du to the absence of light and cold water temperatureb) the bathypelagic zone, due to the absence of light and cold water temperaturec) the mesopelagic zone ,due to uts high light availability and warm water temperature d) the epipelagic zone, due to its high light availability and warm water temperature

Stage in which a star’s outer layers have started to cool and grow outward?

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?