
Concept explainers
Interpretation:
A balanced chemical equation corresponding to the reactions of group I elements with sulfur needs to be presented.
Concept Introduction:
- A
chemical reaction is expressed as a chemical equation having reactants and products on left and right side of the reaction arrow respectively. - A balanced chemical equation is one in which the number of atoms of various elements on the reactants side is equal to that on the product side. It depicts the stoichiometry of a given reaction.
- The equations are balanced in two steps:
1) Balance the atoms by matching the number of atoms of each type on the reactants and product side.
2) Adjust the coefficients to the smallest whole number. A coefficient of '1' is implied and therefore not explicitly written.

Answer to Problem 46A
Explanation of Solution
Group I elements are the alkali metals which include:
Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs) and Francium (Fr)
The required equation involves the reaction between group I metals and solid sulfur to form the corresponding metal sulphide solid. The reactants and products are:
i) Li + S
Reactants:
Product:
Unbalanced equation:
The above equation is not balanced since the number of Li atom on the reactants side is 1 while it is 2 on the product side. In order to balance the above equation, multiply Li by 2 to get:
ii) Na + S
Reactants:
Product:
Unbalanced equation:
The above equation is not balanced since the number of Na atom on the reactants side is 1 while it is 2 on the product side. In order to balance the above equation, multiply Na by 2 to get:
iii) K + S
Reactants:
Product:
Unbalanced equation:
The above equation is not balanced since the number of K atom on the reactants side is 1 while it is 2 on the product side. In order to balance the above equation, multiply K by 2 to get:
iv) Rb + S
Reactants:
Product:
Unbalanced equation:
The above equation is not balanced since the number of Rb atom on the reactants side is 1 while it is 2 on the product side. In order to balance the above equation, multiply Rb by 2 to get:
v) Cs + S
Reactants:
Product:
Unbalanced equation:
The above equation is not balanced since the number of Cs atom on the reactants side is 1 while it is 2 on the product side. In order to balance the above equation, multiply Cs by 2 to get:
vi) Fr+ S
Reactants:
Product:
Unbalanced equation:
The above equation is not balanced since the number of Fr atom on the reactants side is 1 while it is 2 on the product side. In order to balance the above equation, multiply Fr by 2 to get:
The balanced equations corresponding to the reaction of group I metal with sulfur are:
Chapter 7 Solutions
World of Chemistry, 3rd edition
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