Magnesium+oxygen>magnesium oxide 48.6g. + 32.0g> 80.6g
what is the mass of each reactant?
what is the mass of the product?
what is the total mass of reactants?
does this data support the law conservation of mass? explain.

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.