the valencies of metals X, Y and Z are 1,2 and 3 respectively. What are the formulae of their:. a)hydroxides? b)sulphates? c) carbonates? d) hydrogen carbonates? e)nitrates? f)phosphates?​

What effect does a decrease in temperature have on the overall rate of a chemical reaction? a decrease in temperature decreases . the reaction rate will

Which characteristics can be used to differentiate star systems? check all that apply.

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms