Please explain your reasoning. A) Predict the signs (–, +, or 0) of ΔH and ΔS, in that order, for the reaction: O2(g) → 2O(g)
B) Predict the signs (–, +, or 0) of ΔH and ΔS, in that order, for the expansion of an ideal gas into a vacuum

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

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?

Which metals are called noble metals