In the case of FeO, the crystals are cubic, similar to table salt. The ions are kept together by electrostatic forces in a large crystal structure. The unit of charge is the electric charge in one electron. The (II) in the name means iron has a charge of 2+ here. Instead, they are made of ions, charged atoms. Wüstite makes up about 9% of earths mantle and is used as a pigment in tattoos and cosmetics.įeO is also the first example of a salt I get to talk about.
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It is not regular rust, which is mostly Fe 2O 3. But theres still interesting stuff going on in the reactor. Input molecules: Iron(II) oxide, Hydrogen Kinetics are separate from both activation energy and reaction energy. There are kinetically favorable endothermic reactions and kinetically unfavorable exothermic ones. I disagree, kinetics simply show how fast a reaction will go.
Feinne, you explained some of this stuff already, but you seem to imply that exo-/endothermic is related to reaction kinetics. That has to do with activation energy, reaction kinetics, reaction equilibrium, and some other thermodynamics stuff. Instead, Ill use my chemical instincts to guess if such a reaction would be exothermic or endothermic.īy the way, exothermic and endothermic doesnt say anything about how hard it is to make a reaction go.
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For less common, unstable, and fictional molecules, it is possible to theoretically predict those values, but that is quite difficult and I wont be doing that. For common molecules, the chemical energy (standard enthalpy of formation) has often been determined practically and I can easily calculate the reaction energy. Chemical energy is stored in the chemical bonds, so to find out if a reaction is exo- or endo-, all you need to do is compare the total chemical energy in the reactants with the total chemical energy in the products. Therm refers to heat, but these words are also used when another form of energy, such as light, is released or used. Exothermic reactions have a net release of energy, while endothermic reactions use up energy. But Ill have to explain a few things first.Įvery chemical reaction is either exothermic or endothermic. If I were to ask for more, I'd like to see some numbers on whether the reactions are exothermic or endothermic, and how much energy is released/required.Īlright, I can do that.