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why some reactions endothermic and some exothermic
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why some reactions endothermic and some exothermic Related: Balancing...
Most chemical reactions are exothermic, because heat is given out. ... Because in exothermic reactions, energy is given out to the surroundings. This means that the energy of the reactants is higher than the energy of the products. Endothermic reactions are less common.
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why some reactions endothermic and some exothermic Related: Balancing...
Some reactions are endothermic because heat is required or envolved in the reation whereas some are exothermic as heat is produced in the reaction.
Community Answer
why some reactions endothermic and some exothermic Related: Balancing...
On the basis of release of heat during chemical reactions, they can be classified into two types :

Reactions in which heat is released along with the formation of products are called exothermic reactions. 
Reactions in which heat is absorbed from the surroundings or some other source are called endothermic reactions. 
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why some reactions endothermic and some exothermic Related: Balancing Chemical Equations - Chemical Reactions and Equations, Class 10, Science
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