Chemistry - Energy Changes

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ENERGY CHANGES

Exothermic reaction: 

- Heat energy is given out to the surroundings in a chemical reaction.
- The energy content of the product, Hproduct,  is less than the energy content of the reactants, Hreactants. 
- The enthalpy change for an exothermic reaction =  △H = negative value
- As heat energy is given out to the surroundings, the temp in the surrounding increases.  

Energy level diagram:

 Endothermic reaction:

- Heat energy is taken in the surroundings in a chemical reaction.
- The energy content of the product, Hproduct, is more than the

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