Around four hundred million years after the formation of earth, the planet's atmosphere would have been almost entirely a. argon b. oxygen c. nitrogen d. carbon dioxide

Which position represents spring in the southern hemisphere? a) b) c) d)

Can someone me with 1 to 4 plz. fast

An alkaline battery produces electrical energy according to the following equation. zn(s) + 2 mno2(s) + h2o(l) zn(oh)2(s) + mn2o3(s) (a) determine the limiting reactant if 17.5 g zn and 31.0 g mno2 are used. (type your answer using the format ch4 for ch4.) (b) determine the mass of zn(oh)2 produced. _ g