When the products of a reaction are hotter than the reactants: The reaction is exothermic. The reaction is endothermic. The reac
2 answers:
Answer: Option (a) is the correct answer.
Explanation:
A chemical reaction in which energy is released is known as an exothermic reaction.
For example,
In an exothermic reaction, energy of products is less than the energy of reactants. As heat is released that is why, formation of products become hotter.
On the other hand, a chemical reaction in which energy is absorbed by reactant molecules is known as an endothermic reaction.
For example,
In an endothermic reaction, energy of products is more than the energy of reactants. As heat is absorbed, so formation of products become colder.
Thus, we can conclude that when the products of a reaction are hotter than the reactants the reaction is exothermic.
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Answer: The half-reactions represents reduction are as follows.
Explanation:
A half-reaction where addition of electrons take place or a reaction where decrease in oxidation state of an element takes place is called reduction-half reaction.
For example, the oxidation state of Cr in is +6 which is getting converted into +3, that is, decrease in oxidation state is taking place as follows.
Similarly, oxidation state of Mn in is +7 which is getting converted into +2, that is, decrease in oxidation state is taking place as follows.
Thus, we can conclude that half-reactions represents reduction are as follows.