Evan has a rock. the rock has a mass of 12g and a volume of 4cm3. what is the density of the rock?

Which is the layer underground where all empty spaces are filled with a combination of air and water ?

Consider the reaction: n2(g) + o2(g) ⇄ 2no(g) kc = 0.10 at 2000oc starting with initial concentrations of 0.040 mol/l of n2 and 0.040 mol/l of o2, calculate the equilibrium concentration of no in mol/l how would this be done?

How does kepler second law of planetary motion overthrow one of the basic beliefs of classical astronomy