1.Are all combustion reactions redox? Explain. 2.What is the difference between
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Question
1.Are all combustion reactions redox? Explain.
2.What is the difference between burning and heating? How can you tell in the lab if you are heating or burning?
3.Redox reaction involve the transfer of electrons between reactants in a reaction. But what characteristic macroscopic changes, if any, accompany a redox reaction? In other words, what are the outward signs of a redox reaction?
4.Can a reaction have more than one Group 2 designation? For instance, can a reaction be gas evolving and also be a redox reaction? Explain using an example.
Explanation / Answer
1)Are all combustion reactions redox? Explain
Solution :-
All combustion reactions are considered as redox reactions because in the combustion reaction substance being combusted is reacts with the oxygen gas (O2) to given the products like CO2 and H2O
In this process oxidation state of the oxygen changes from 0 to -2 means oxygen undergoes reduction and the other substance with which the oxygen is combined is get oxidized because addition of oxygen is nothing but considered as oxidation.
2)What is the difference between burning and heating? How can you tell in the lab if you are heating or burning?
Solution :- Heating is the process in which the kinetic energy of the molecules is increased. But the material being heated is not burst into the flame or it did not catch fire.
But burning is the process in which the material being burned is catches the flame and converts into the other products of the combustion reaction therefore the original material no longer remain, it get converted into other products like CO2 and H2O.
Warming the beaker full of water is the process of heating.
The burner flame used to heat the beaker of water is the example of burning because the fuel from the burner burns and gives the heat energy which is used to warm the water.
3.Redox reaction involve the transfer of electrons between reactants in a reaction. But what characteristic macroscopic changes, if any, accompany a redox reaction? In other words, what are the outward signs of a redox reaction?
Solution :- The outward signs or the macroscopic changes associated with the redox reactions are as follows.
Color of the substance may get changed because of the change in the oxidation state of the reacting materials.
The change in the electric current can also be seen with the redox reactions.
Reacting substances gets soluble or may form new products in the form of precipitates.
4.Can a reaction have more than one Group 2 designation? For instance, can a reaction be gas evolving and also be a redox reaction? Explain using an example.
Solution :- a reaction can have more than one group designations and it can be a gas evolving and redox reaction simultaneously.
Example
Reaction of the Zn metal with the HCl acid will evolve the H2 gas. In this reaction the oxidation state of the Zn changes from 0 to +2 so Zn undergoes oxidation and oxidation state of hydrogen changes from +1 to 0 this means hydrogen undergoes reduction since both oxidation and reduction takes place simultaneously therefore it is considered as redox reaction and also reaction is producing hydrogen gas therefore it is gas evolving reaction as well. Reaction equation is as follows.
Zn(s) + 2HCl(aq) ------ > ZnCl2(aq) + H2(g)
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