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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Which two of the following reactions are oxidation-reduction reactions? Explain your answer in each case. Classify the remaining reaction.

(a) Zn(s) + 2 NO3(aq) + 4 H3O+(aq) → Zn2+(aq) + 2 NO2(g) + 6 H2O()

(b) Zn(OH)2(s) + H2SO4(aq) → ZnSO4(aq) + 2 H2O()

(c) Ca(s) + 2 H2O(ℓ) → Ca(OH)2(s) + H2(g)

(a)

Interpretation Introduction

Interpretation:

The oxidation-reduction reaction should be identified from the given reactions.

Concept introduction:

Precipitation reaction: The formation of the product is insoluble when the ions combine in the solution is called precipitation reaction.

Acid - base reaction: Formation of the salt from the cation from the base and anion from the acid and formation of water is also the product.

Gas forming reaction: The reaction of acid and metal carbonates which produce carbonic acid.  The carbonic acid decomposes which gives water and carbon dioxide.

Oxidation - reduction reaction: The electrons are transferred to one to other is called oxidation reduction reaction.

An oxidizing agent gains the electrons and is reduced in a chemical reaction and it is electron acceptor.

A reducing agent loses electrons and is oxidized in a chemical reaction and it is electron donor.

The oxidation state is called as oxidation number, which describes degree of oxidation (loss of electrons) of an atom in a chemical compound.  Theoretically, the oxidation state is positive, negative or zero.

Explanation

The given reaction is Oxidation - reduction reaction, which is shown below

  

The oxidation number of zinc is zero in the reactant and +2 in the product.  Therefore it is loss the electron and therefore zinc is oxidized.

Net charge on NO3- is equal to sum of the oxidation number of nitrogen atoms.  Therefore,

Net charge = Number of oxidation state of N atom + number of oxidation state of oxygen atom.-1 = (x) + 3 (-2)-1 = (x) + 3 (-2)-1 = x- 65 = xX = 5

Net charge on NO2 is equal to sum of the oxidation number of nitrogen atoms

(b)

Interpretation Introduction

Interpretation:

The oxidation-reduction reaction should be identified from the given reactions.

Concept introduction:

Precipitation reaction: The formation of the product is insoluble when the ions combine in the solution is called precipitation reaction.

Acid - base reaction: Formation of the salt from the cation from the base and anion from the acid and formation of water is also the product.

Gas forming reaction: The reaction of acid and metal carbonates which produce carbonic acid.  The carbonic acid decomposes which gives water and carbon dioxide.

Oxidation - reduction reaction: The electrons are transferred to one to other is called oxidation reduction reaction.

An oxidizing agent gains the electrons and is reduced in a chemical reaction and it is electron acceptor.

A reducing agent loses electrons and is oxidized in a chemical reaction and it is electron donor.

The oxidation state is called as oxidation number, which describes degree of oxidation (loss of electrons) of an atom in a chemical compound.  Theoretically, the oxidation state is positive, negative or zero.

(c)

Interpretation Introduction

Interpretation:

The oxidation-reduction reaction should be identified from the given reactions.

Concept introduction:

Precipitation reaction: The formation of the product is insoluble when the ions combine in the solution is called precipitation reaction.

Acid - base reaction: Formation of the salt from the cation from the base and anion from the acid and formation of water is also the product.

Gas forming reaction: The reaction of acid and metal carbonates which produce carbonic acid.  The carbonic acid decomposes which gives water and carbon dioxide.

Oxidation - reduction reaction: The electrons are transferred to one to other is called oxidation reduction reaction.

An oxidizing agent gains the electrons and is reduced in a chemical reaction and it is electron acceptor.

A reducing agent loses electrons and is oxidized in a chemical reaction and it is electron donor.

The oxidation state is called as oxidation number, which describes degree of oxidation (loss of electrons) of an atom in a chemical compound.  Theoretically, the oxidation state is positive, negative or zero.

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