Witch two elements are most likely to react and form a compound? what type of compound are they likely to form

Express the following number in scientific notation. 0.026890 =

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

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?