For each of the following, Identify the system and its surroundings and give the direction of the heat flow:. a. Methane gas burning in a gas furnace b. Two chemicals are mixed in a flask sitting on a laboratory bench. A reaction occurs and heat is evolved. c. Water drops sitting on your skin, after a dip in a swimming pool, evaporates.

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

The picture represents the process that produces most of the energy used by living organisms on earth. which process is represented in the picture? a) the magnetic attraction between two hydrogen nuclei. b) the fusion of hydrogen nuclei to produce a helium nucleus in the core of the sun. c) the fission of hydrogen nuclei to produce a helium nucleus in the core of the sun. d) the chemical reaction between hydrogen nuclei to produce a helium nucleus in earth's atmosphere.

What is calcium oxide+diphosphorus pentoxide--> calcium phosphate balanced