Okay so we have our glucose combusting and we're saying it's releasing 2,808 kilo joules of heat, it's a lot of energy when reaction occur. Then we also have combustion reactions all have been, we're going to actually denote that as delta H comb to say that this is a combustion reaction. What we have is substance ammonium nitrate it's being dissolved in some water and breaking up to it's ions and it's actually going to require some energy 27 kilo joules of energy you've noticed that there's no negative here telling me that I'm requiring that much energy to make this reaction take place it's an endothermic reaction okay great. We also have a reaction or this is actually a solubility reaction. So when these 2 guys combine and form rust, we're releasing 1625 kilo joules of heat okay great. And notice that the delta H is 1625 kilo joules meaning that it's releasing that much energy into the atmosphere. So we have our first reaction which is just a simple combination reaction or a synthesis reaction. Okay so I have on the board several different types of reactions that, and I have also included their enthalpy changes or energy changes in it. We're going to call this delta H or enthalpy change. So we're going to call those guys thermo chemical equations and they're balanced chemical equations that include the physical states of all reactants and products which they should always have and the energy change. Alright so sometimes when you're dealing with balanced thermo chemical equations you're going to want to include the amount of energy that's either being absorbed or released in that reaction.
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