Plz the periodic change between night and day is caused by

a the moons rotation

b earth revolution aruond the sun

c the moons revolution around earth

d earths rotation

In all living cells dna controls cellular activities by

Kc = 0.040 for the system below at 450oc. if a reaction is initiated with 0.40 mole of cl2 and 0.40 mole of pcl3 in a 2.0 liter container, what is the equilibrium concentration of cl2 in the same system? pcl5(g) ⇄ pcl3(g) + cl2(g)

Explain what happens at the saturation point when adding salt to water at room temperature.