energy changes and analysis tests
- Created by: linda
- Created on: 21-05-11 18:14
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Energy changes.
energy is measured in joules (J). values for heat energy and dietry information are soemtimes given in calories... 1 calorie=4.2j
a calirometre can be used to measure the amount of heat produced when a substance is burnt. to find the overall energy change for a reaction you subtract the energy for the product from the energy or reactants..
negative value= exothermic
postive value= endothermic
endothermic= >takes in heat
> surroundings cool down
> more energy is taken in to break the bonds
>step up on energy level diagram
exothermic = > gives out heat energy
>more energy is released
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