Estimate the time needed for a glycine molecule to diffuse a distance of 10 μm in water at 20∘c if its concentration varies over that distance from 1.00 mol/m3 to 0.70 mol/m3 ?

- lead + phosphoric acid = hydrogen + lead(ii) phosphate

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.