Roasted copper ore containing cus04 is to be extracted in a counter-current stage extractor using pure water each hour, 100 tons of roasted copper ore, which contains 90 wt.% inert solids, 8 wt% cuso4 and 2 wt% of water is to be treated. the strong solution produced is to consist of 20 wt% cuso4. the recovery of cuso4 from the ore is 95 %. after each stage, 1 ton of inert solids retain 0.25 ton of water (just water) in addition to the copper sulfate dissolved in water. equilibrium is attained in each stage.

I'm sorry but i'm only grade

D. h2o + h2o > h3o + oh- confirmed.

The answer is false because: gravitational force is independent of medium and depends only on the masses of the two objects and the distance between them

Van der waals forces are temporary electromagnetic forces established between uncharged atoms. some neutral molecules, when close together, can become temporarily “charged,” as electrons move around the atom. water is a polar molecule, the side of the molecule that the hydrogens bond to being more positive, and the opposite side bound to the lone pairs of electrons being more negative. this means that it participates in dipole-dipole interaction (non-polar exhibits dispersion forces), and it has the capacity for hydrogen bonding.