Interpretation: The effect on the concentrations of the reactants and products during the course of a
Concept introduction: In a chemical reaction, the reactants are written on the left side of the equation and the product is written on the right side. The product and the reactants contain an arrow between them showing the proceeding of the reaction from the reactants to the products.

Answer to Problem 40A
When the reaction proceeds, the reactant concentration decreases and product concentration increases.
Explanation of Solution
In a chemical reaction, the product is formed as a result of the decomposition of reactants. Initially, there is a high concentration of reactants and nearly zero concentration of the products. When the reaction proceeds, products start to form, and hence, the concentration of reactants starts to decrease.
Before proceeding of the reaction, the reactant concentration is high and that of the product is low, but when the reaction proceeds, the reactant concentration decreases and product concentration increases.
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