The chemical reaction 2Cu + O2 → 2CuO + 315 kJ is an _____ reaction. Endothermic, combustion Exothermic, combustion Endothermic,
2 answers:
Answer: Exothermic
Explanation: Combustion reaction is a chemical reaction in which hydrocarbon burns in the presence of oxygen to form carbon dioxide, water and energy.
Exothermic reactions are those in which energy is released and endothermic reactions are those in which energy is absorbed.
A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution.
As in the given reaction, the energy is released thus reaction s exothermic.
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Answer : This is homogeneous catalysis. Br⁻ is behaving as a catalyst
Explanation :
Let us write down the given reactions.
.....Slow
.....Fast
A catalyst is defined as a substance that increases the rate of the reaction.
A catalyst takes part in the reaction by reacting with the reactants to form an intermediate. But it is regenerated at the end of the reaction.
If we take a look at the above reactions, we can see that bromide ion Br⁻ is reacting with H₂O₂ to form an intermediate BrO⁻. It is also getting regenerated back at the end. That means Br⁻ is behaving as a catalyst.
We can also see that the reactant and the catalyst are in the same phase which is aqueous phase. Therefore the reaction is homogeneous.
A homogeneous reaction is the one where the reactants and the catalyst are in the same phase.