   Chapter 21, Problem 47PS

Chapter
Section
Textbook Problem

Write balanced equations for the reactions of aluminum with HCl(aq), Cl2, and O2.

(a)

Interpretation Introduction

Interpretation: The balanced reaction equation of aluminium with HCl(aq) has to be given.

Concept introduction: Main group elements are categorized as s-block and p-block elements. The s-block elements include metals belonging to group 1A and group 2A and elements from group 3A to 8A are referred to as p-block elements.

Aluminium belongs to group 3A of periodic table and has a highest oxidation number of +3. The highest oxidation number is always equal to the group number. Thus, aluminum forms compounds with oxides and halides in the oxidation number of aluminium is +3.

Explanation

Aluminium reacts with hydrochloric acid to form aluminium chloride and hydrogen gas. Aluminium loses electrons and forms Al3+.

AlAl3++3e

These elctrons are gained by H+ of HCl and its forms H2.

2H++2eH2

The balanced chemical equation for the reaction of aluminium with HCl is:

(b)

Interpretation Introduction

Interpretation: The balanced reaction equation of aluminium with HCl(aq) has to be given.

Concept introduction: Main group elements are categorized as s-block and p-block elements. The s-block elements include metals belonging to group 1A and group 2A and elements from group 3A to 8A are referred to as p-block elements.

Aluminium belongs to group 3A of periodic table and has a highest oxidation number of +3. The highest oxidation number is always equal to the group number. Thus, aluminum forms compounds with oxides and halides in the oxidation number of aluminium is +3.

(c)

Interpretation Introduction

Interpretation: The balanced reaction equation of aluminium with O2 has to be given.

Concept introduction: Main group elements are categorized as s-block and p-block elements. The s-block elements include metals belonging to group 1A and group 2A and elements from group 3A to 8A are referred to as p-block elements.

Aluminium belongs to group 3A of periodic table and has a highest oxidation number of +3. The highest oxidation number is always equal to the group number. Thus, aluminum forms compounds with oxides and halides in the oxidation number of aluminium is +3.

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