Is the same reactant always the limiting reactant?

How are elements arranged in a periodic table

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer

Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.