Chapter 7, Problem 6ALQ

Interpretation Introduction

Interpretation:

Why the formation of water is evidence of a chemical reaction should be explained.

Concept Introduction:

A balanced chemical equation is an equation that contains same number of atoms as well as of each element of reactants and products of reaction.

Molecular equation:

The equation which shows all of reactants and products in molecular or un-dissociated form is known as Molecular equation. For example the molecular equation of solutions of potassium bromide and silver nitrate is as follows:

$\text{KBr }(aq)+{\text{ AgNO}}_{\text{3}}(aq)\to {\text{ KNO}}_{\text{3}}(aq)+\text{ AgBr }(s)$

Complete ionic equation:

In the complete ionic equation the strong electrolytes indicates by as ions. For example the complete ionic equation of solutions of potassium bromide and silver nitrate is following

$\begin{array}{l}{\text{K}}^{+}(aq)+{\text{ Br}}^{-}(aq)+{\text{ Ag}}^{+}(aq)+{\text{ NO}}_3^{-}(aq)\to \\ {\text{ K}}^{+}(aq)+{\text{ NO}}_3^{-}(aq)+\text{ AgBr }(s)\end{array}$

Net ionic equation:

In the net ionic equation there is no any spectator ion , only those species or ions whichundergoes change ispresent called net ionic equation. For example the net ionic equation of solutions of potassium bromide and silver nitrate is following:

${\text{ Br}}^{-}(aq)+{\text{ Ag}}^{+}(aq)\to \text{AgBr }(s)$

The most common driving forces which create product in chemical reactions are as follows:

1. Formation of a solid.
2. Formation of water.
3. Transfer of electrons.
4. Formation of gas.