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- an example of the conversions is 98 cal to joules, where 98 gets multiplied by 4.184 to get 410.032 joules.
- but anyways, back to the original lesson topic, Thermochemistry, defined as the study of energy and heat changes in the syatem and surroundings.
- a system is the part of a process that is being studied. like sparkler's. and the surroundings are everything else around it. and when you put the two together? you get the universe.
- some VERY important factors are covered in thermochemistry. such as calorimetry, enthalpy, and the collision theory.
- calorimetry is used to measure heat being transferred to and from a substance. and enthalpy is defined as the amount of heat being stored in the first place in a system.
- how on earth is calorimetry useful to me at all?
- calorimetry is actually one of the most important things for you, as it regulates your body temperature.
- and as for enthalpy, we are reintroduced to exothermic and endothermic.
- enthalpy fusion is absorption and therefore endothermic and would be positive on a graph. enthalpy solidification however, is releasing and therefore exothermic and would be negative on a graph.
- and as another important factor of thermochemistry, the collisions theory is a theory where it states that particles MUST interact with each other in order to start a chemical reaction.
- the first reactant of the theory is that in order for a reaction, the particles must collide. the second is they must collide properly for the reaction to occur properly. and the third is they must collide with just enough energy to stick together for this reaction to be successful.
- some contributions to these reactions to make them faster are concentration, which if increased, will increase the number of particles in the reactant and therefore cause more reactions. the second contribution is surface area, which if increased offers more places for the reactions to multiply. the third contribution is temperature, which if increased will add more kinetic energy to the mix and speed up the movement in the particles. and the fourth and final factor is catalysts, which lower the activation energy and make the Ea barrier easier to overcome which inturn, makes reactions happen more quickly.
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- and that's it!!
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