Answer:
Evaporation
Explanation:
Though it doesn't require high temperatures to do so
Three groups
gases, metals, metalliods/nonmetals
We are given with the mass of pure iron that reacts with oxygen to form an oxide which has a given mass as well. the mass of oxygen reacted is 8.15-6.25 g or 1.9 grams. THen we convert the mass of the reactants to moles. Iron is equal to 0.1119 moles and oxygen is equal to 0.1188. We divide each number to the less amount. Hence iron is 1 and oxygen is approx 1. The empirical formula hence is FeO or ferrous oxide or Iron (II) oxide.
True!
Energy released by system is absorbed by surroundings.
Second one i think.......
