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Its where heat is taken in in a reaction eg making a cake is an endothermic reaction as heat is taken in to start it ;)
You probably mean "what reaction releases energy," in which case, lots. Reactions that release energy into the environment are called exothermic reactions. An example of which would be mixing sodium (Na) and water (H2O) to form sodium hydroxide (NaOH), hydride (H2), and heat/energy. 2Na + 2H2O ---> 2NaOH + H2 + heat/energy
... is an exothermic reaction (opposite of 'endothermic')
In an exothermic reaction heat energy is released.
Activation Energy.
endothermic
endothermic
base
endothermic
A reaction where energy is taken in.
Depending on the particular chemical reaction, energy may be either released or absorbed.
In an endothermic reaction, heat is taken in from the environment. Heat is a form of energy. Therefore, energy is taken in, i.e. absorbed.
Depending on the particular chemical reaction, energy may be either released or absorbed.
Combustion, burning, releases more heat that is taken in to start the reaction.
Exothermic Reaction
Its where heat is taken in in a reaction eg making a cake is an endothermic reaction as heat is taken in to start it ;)
Energy is only made not taken away. But during a chemical reaction, it depends on what kind of chemicals you put in there.