Which mixture can be classified as a homogeneous mixture?

How many moles of magnesium is 3.01 x10^22 atoms of magnesium?

If a polyatomic ionic compound has gained two hydrogen ions, then how does its name begin?

Joe shines white light into a bowl half full of water at an angle of incident of 27.5°. calculate the angle of refraction in the water given the indices of refraction for air and water are 1.00 and 1.36, respectively.