The process of changing free nitrogen gas into a useable form of nitrogen is called

What is the independent variable in this investigation? mass volume sample number substance density

Explain in detail of the four major scientific developments that spurred the formulation of the plate tectonics theory

Insoluble sulfide compounds are generally black in color. which of the following combinations could yield a black precipitate? check all that apply. na2s(aq)+kcl(aq) li2s(aq)+pb(no3)2(aq) pb(clo3)2(aq)+nano3(aq) agno3(aq)+kcl(aq) k2s(aq)+sn(no3)4(aq)