Thermochemistry
What is Thermochemistry?
Why study Thermochemistry?
(http://chemtutorial.webs.com/thermochemistryapplied.htm)
- Study of energy changes that occur during chemical reactions and changes in state.
Why study Thermochemistry?
- Many things in the real world are a result of the transfer of heat. From the simple things such: as putting ice into your glass of water to burning fuel for a car.
- When exercising, the body naturally cools down due to sweating. That is because our bodies supply the heat necessary to evaporate the water. Perhaps after exercising, one uses a hot or cold pack. The manufacturing of these little godsends to athletes relies on the endothermic properties of some compounds such as ammonium nitrate to create the cold sensation. Conversely, calcium chloride or magnesium sulfate are compounds that dissolve in water exothermically, releasing that warm, soothing sensation after the blistering cold.
(http://chemtutorial.webs.com/thermochemistryapplied.htm)
Endothermic & Ecothermic
Exothermic-
- Heat flows into a system
- Endothermic-
- Heat flows out of the system
Ecothermic Reactions
C3H8 + 5O2 → 3CO2 + 4H2O + 2043 kJ
In this equation you can see that the bolded part is energy. Ecothermic reactions that release heat energy.
In exothermic reactions:
In this equation you can see that the bolded part is energy. Ecothermic reactions that release heat energy.
In exothermic reactions:
- Heat is one of the products
- The temperature of the surrounding area increases.
Endothermic Reactions
C(s) + H2O(g) + 113 kJ → CO2(g) + H2(g)
In this equation you can see that the bolded part is energy. Endothermic reactions that absorb heat energy.
In endothermic reactions:
In this equation you can see that the bolded part is energy. Endothermic reactions that absorb heat energy.
In endothermic reactions:
- Heat is one of the reactants
- The temperature of the surrounding area decreases.
Below is a video with a few demonstrations of Endothermic and Ecothermic Reactions.