4Fe(s) + 3O2(g) ⟶ 2Fe2O3(g) In a certain reaction, 27.3 g of iron reacts with 45.8 g of oxygen. How many grams of the excess reactant remain after the reaction is complete?

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?

All of the following are homogeneous mixtures except a) sugar dissolved in water. b) orange juice. c) coffee with cream. d) household vinegar. e) apple juice

Salt in oceans comes from and of rocks