250 ml of nitrogen takes 30 sec and 300 ml of unknown gas takes 45 sec to diffuse through a porous membrane under similar condition. Determine the relative density of unknown gas.

3.09 lab: reaction of metals 1 which combinations of substances resulted in a chemical change? for each metal that participated in a chemical change, write the type of metal it is, based on your examination of the periodic table. were there any metallic compounds that did not react with either the acid or the base? write the type of metal, based on your examination of the periodic table. make a general statement about the reactivity of the metals in this experiment.