Rank the types of molecules from 1-4, 1 being passes through the cell membrane with the most ease and 4 being possess with most difficulty.

Small, polar/hydrophilic molecules (Ex. H20)

Charged lons (Ex. K+)

Small, non polar hydrophobic molecules (Ex. 02)

Large, polar/hydrophilic molecules (Ex.
C6H1206)

For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)