July 10th, 2002

Some chemistry questions

Which salt must be added to water and ice to get temperature lower than -18C ?

Which acid (HCl, HNO3, H2SO4, H3PO4) is the most economical to use to get 10 liters of H2 from the reaction with Zn ?

How is this thing called and what is it used for?

In three different containers are the gases of HCl, N2 and Br. How to find out which gas is in which container?
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