Which chemical reaction involves the production of a gas? 2li(s) + f2(g) mc012-1.jpg 2lif(s) zn(s) + 2hcl(aq) mc012-2.jpg h2(g) + zncl2(aq) hno3(l) + h2o(l) mc012-3.jpg h3o+(aq) + no3–(aq) k2cro4(aq) + ba(no3)2(aq) mc012-4.jpg bacro4(s) + 2kno3(aq)

h let me think

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.