Does a reaction occur when aqueous solutions of copper(II) sulfate and lead(II) nitrate are combined? a) Yes
b) No

0.09 moles of sodium sulfate in 12 ml of solution

Chen drew a diagram to compare the ways in which different organisms obtain nitrogen. which label belongs to the area marked z?

Asample of hydrated tin (ii) chloride (sncl2) has a mass of 4.90 g. when it is dehydrated, it has a mass of 4.10 g. which is the correct chemical formula for the hydrate? sncl2•2h2o          sncl2•4h2o          sncl2•6h2o