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Chapter 4: Q4.85P (page 181)

Are all combustion reactions redox reactions? Explain

Short Answer

Expert verified

You need to explain that all the combustion reactions are redox reactions.

Step by step solution

01

General Combustion Reaction

2COg+O2g鈫�2CO2g

02

Oxidation of carbon in CO

Oxidation no of oxygen is -2.

Let assume, oxidation no of carbon in CO is x.

Now you can write,

x+-2=0x=+2

03

Oxidation no of carbon in CO2

Oxidation no of oxygen is -2.

Let assume, oxidation no of carbon in CO2 is y.

Now you can write,

y+2-2=0y=+4y+2-2=0y=+4

04

Oxidation no of oxygen

The oxidation no of oxygen in O2 is 0.

The oxidation no of oxygen in CO2 is -2.

05

Conclusion

In a combustion reaction,

The oxidation no of oxygen is 0 in O2 decreases to -2 in CO2. Therefore, O2 undergoes reduction.

The oxidation no of carbon is +2 in CO increases to +4 in CO2. Therefore, CO undergoes oxidation.

Hence, all combustion reactions are redox reaction.

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Most popular questions from this chapter

Calcium dihydrogen phosphate, Ca(H2PO4)2, and sodium hydrogen carbonate, NaHCO3, are ingredients of baking powder that react with each other to produce CO2, which causes dough or batter to rise:

Ca(H2PO4)2(s)+NaHCO3(s)鈫�CO2(g)+H2O(g)+CaHPO4(s)+Na2HPO4(s)

[unbalanced]

If the baking powder contains 31% NaHCO3and 35% Ca(H2PO4)2 by mass:

(a) How many moles of CO2 are produced from 1.00 g of baking powder?

(b) If 1 mol of CO2 occupies 37.0 L at 350_F (a typical baking temperature), what volume of CO2is produced from 1.00 g of baking powder?

Balance each of the following redox reactions and classify it as a combination, decomposition, or displacement reaction:

aCas+H2Ol鈫�CaOH2aq+H2g

bNaNO3s鈫�NaNO2s+O2g

cC2H2g+H2g鈫�C2H6g

A typical formulation for window glass is 75% SiO2, 15% Na2O, and 10.% CaO by mass. What masses of sand (SiO2), sodium carbonate, and calcium carbonate must be combined to produce 1.00 kg of glass after carbon dioxide is driven off by thermal decomposition of the carbonates?

A reaction cyclefor an element is a series of reactions beginning and ending with that element. In the following copper reaction cycle, copper has either a 0 or a _2 oxidation state. Write balanced molecular and net ionic equations for each step in the cycle.

(1) Copper metal reacts with aqueous bromine to produce a green-blue solution.

(2) Adding aqueous sodium hydroxide forms a blue precipitate.

(3) The precipitate is heated and turns black (water is released).

(4) The black solid dissolves in nitric acid to give a blue solution.

(5) Adding aqueous sodium phosphate forms a green precipitate.

(6) The precipitate forms a blue solution in sulfuric acid.

(7) Copper metal is recovered from the blue solution when zinc metal is added.

Question: State a general equation for a neutralization reaction.
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