Chemistry & Chemical Reactivity
Chemistry & Chemical Reactivity
9th Edition
ISBN: 9781133949640
Author: John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher: Cengage Learning
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Chapter 21, Problem 1PS

Give examples of two basic oxides. Write equations illustrating the formation of each oxide from its component elements. Write another chemical equation that illustrates the basic character of each oxide.

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Interpretation Introduction

Interpretation: Examples for two basic oxides has to be given. Equations illustrating the formation of each oxide from its component elements should be written.

Concept introduction: Oxides are formed by reaction of metal with oxygen. If metal belongs to group 2A of periodic table, then the general reaction of formation of oxide is:

    M(s)+O2(g)MO(s)

Here, metal has +2 oxidation number and oxide ion has 2 oxidation number.

A basic oxide is an oxide that shows basic properties in solution. Basic oxides on reaction with water form a base. This is a characteristic property of basic oxides and thus illustrates its basic behavior. Basic oxides are mostly oxides of group 1A and 2A elements. Thus, basic oxides are generally oxides of metals and they react with water to form alkaline solutions of metal hydroxides. The general reaction of a metal oxide with water is as follows:

    MO(s)+H2O(l)M(OH)2(aq)

Answer to Problem 1PS

The two example of basic oxides are CaO and MgO.

The equation illustrating the formation of each oxide from its elements is:

For CaO,

    2Ca(s)+O2(g)2CaO(s)

For MgO,

    2Mg(s)+O2(g)2MgO(s)

The equation that illustrates the basic character of each oxide is:

For CaO,

    CaO(s)+H2O(l)Ca(OH)2(aq)

For MgO,

    MgO(s)+H2O(l)Mg(OH)2(aq)

Explanation of Solution

Basic oxides are generally oxides of metals of group 1A and 2A metals. The two examples of basic oxide are CaO and MgO. Both calcium and magnesium belongs to group 2A of periodic table and have  highest oxidation number of +2. Oxide ion has oxidation number of 2. Thus, the formula of the product is CaO and MgO respectively.

Thus, the balanced chemical equation is:

  • 2Ca(s)+O2(g)2CaO(s)
  • 2Mg(s)+O2(g)2MgO(s)

The stoichiometric coefficients are multiplied with the compounds in the chemical equation to have equal number of atoms on both sides of the equation. Since oxygen is present as O2 in the reaction, hence the stoichiometric coefficient of metal oxide is 2 due to which metal also has a stoichiometric coefficient of 2.

A major property of basic oxide that illustrates its basic character is that the basic oxides on reaction with water produce alkaline solution of hydroxides. Thus, the equation illustrating the basic character of each oxide is the reaction of its oxide with water.

  • CaO(s)+H2O(l)Ca(OH)2(aq)+H2(g)
  • MgO(s)+H2O(l)Mg(OH)2(aq)+H2(g)

Thus, both CaO and MgO forms alkaline solution of their hydroxides on reaction with water, which illustrates that these oxides are basic in nature.

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Chapter 21 Solutions

Chemistry & Chemical Reactivity

Ch. 21.8 - Prob. 4QCh. 21.8 - Prob. 3RCCh. 21.11 - Prob. 1QCh. 21.11 - Prob. 2QCh. 21 - Give examples of two basic oxides. Write equations...Ch. 21 - Prob. 2PSCh. 21 - Prob. 3PSCh. 21 - Prob. 4PSCh. 21 - Prob. 5PSCh. 21 - Prob. 6PSCh. 21 - For the product of the reaction you selected in...Ch. 21 - For the product of the reaction you selected in...Ch. 21 - Prob. 9PSCh. 21 - Prob. 10PSCh. 21 - Place the following oxides in order of increasing...Ch. 21 - Place the following oxides in order of increasing...Ch. 21 - Prob. 13PSCh. 21 - Prob. 14PSCh. 21 - Prob. 15PSCh. 21 - Prob. 16PSCh. 21 - Prob. 17PSCh. 21 - Prob. 18PSCh. 21 - Prob. 19PSCh. 21 - Prob. 20PSCh. 21 - Prob. 21PSCh. 21 - Write balanced equations for the reaction of...Ch. 21 - Prob. 23PSCh. 21 - (a) Write equations for the half-reactions that...Ch. 21 - When magnesium bums in air, it forms both an oxide...Ch. 21 - Prob. 26PSCh. 21 - Prob. 27PSCh. 21 - Prob. 28PSCh. 21 - Calcium oxide, CaO, is used to remove SO2 from...Ch. 21 - Prob. 30PSCh. 21 - Prob. 31PSCh. 21 - The boron trihalides (except BF3) hydrolyze...Ch. 21 - When boron hydrides burn in air, the reactions are...Ch. 21 - Prob. 34PSCh. 21 - Write balanced equations for the reactions of...Ch. 21 - Prob. 36PSCh. 21 - Prob. 37PSCh. 21 - Alumina, Al2O3, is amphoteric. Among examples of...Ch. 21 - Prob. 39PSCh. 21 - Prob. 40PSCh. 21 - Describe the structure of pyroxenes (see page...Ch. 21 - Describe how ultrapure silicon can be produced...Ch. 21 - Prob. 43PSCh. 21 - Prob. 44PSCh. 21 - Prob. 45PSCh. 21 - Prob. 46PSCh. 21 - Prob. 47PSCh. 21 - The overall reaction involved in the industrial...Ch. 21 - Prob. 49PSCh. 21 - Prob. 50PSCh. 21 - Prob. 51PSCh. 21 - Prob. 52PSCh. 21 - Prob. 53PSCh. 21 - Prob. 54PSCh. 21 - Prob. 55PSCh. 21 - Sulfur forms a range of compounds with fluorine....Ch. 21 - The halogen oxides and oxoanions are good...Ch. 21 - Prob. 58PSCh. 21 - Bromine is obtained from brine wells. The process...Ch. 21 - Prob. 60PSCh. 21 - Prob. 61PSCh. 21 - Halogens combine with one another to produce...Ch. 21 - The standard enthalpy of formation of XeF4 is 218...Ch. 21 - Draw the Lewis electron dot structure for XeO3F2....Ch. 21 - Prob. 65PSCh. 21 - Prob. 66PSCh. 21 - Prob. 67GQCh. 21 - Prob. 68GQCh. 21 - Consider the chemistries of the elements...Ch. 21 - When BCl3 gas is passed through an electric...Ch. 21 - Prob. 71GQCh. 21 - Prob. 72GQCh. 21 - Prob. 73GQCh. 21 - Prob. 74GQCh. 21 - Prob. 75GQCh. 21 - Prob. 76GQCh. 21 - Prob. 77GQCh. 21 - Prob. 78GQCh. 21 - Prob. 79GQCh. 21 - Prob. 80GQCh. 21 - Prob. 81GQCh. 21 - Prob. 83GQCh. 21 - Prob. 84GQCh. 21 - A Boron and hydrogen form an extensive family of...Ch. 21 - In 1774, C. Scheele obtained a gas by reacting...Ch. 21 - What current must be used in a Downs cell...Ch. 21 - The chemistry of gallium: (a) Gallium hydroxide,...Ch. 21 - Prob. 89GQCh. 21 - Prob. 90GQCh. 21 - Prob. 91GQCh. 21 - Prob. 92GQCh. 21 - Prob. 93ILCh. 21 - Prob. 94ILCh. 21 - Prob. 95ILCh. 21 - Prob. 96ILCh. 21 - Prob. 97ILCh. 21 - Prob. 98ILCh. 21 - Prob. 99SCQCh. 21 - Prob. 100SCQCh. 21 - Prob. 101SCQCh. 21 - Prob. 102SCQCh. 21 - Prob. 103SCQCh. 21 - Prob. 104SCQCh. 21 - Prob. 105SCQCh. 21 - Prob. 106SCQCh. 21 - Prob. 107SCQCh. 21 - Prob. 108SCQCh. 21 - Prob. 109SCQCh. 21 - Prob. 110SCQCh. 21 - Comparing the chemistry of carbon and silicon. (a)...Ch. 21 - Prob. 112SCQCh. 21 - Xenon trioxide, XeO3, reacts with aqueous base to...
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