Chapter 18, Problem 5STP

Interpretation Introduction

Interpretation: The true statement needs to be identified for the given reaction.

Concept introduction: In balanced equation, both sides of the arrow have equal number of same type of atoms. In balance chemical equation, total mass at the reactant side is equal to total mass at product side.

Answer to Problem 5STP

B. When the equation is balanced in standard form, the coefficient in front of the Ag and ${\text{Ag}}^{+}$ is 2.

Explanation of Solution

B.

Given reaction is as follows:

${\text{Ag}}^{\text{+}}\left(aq\right)+\text{Cu}\left(s\right)\to {\text{Cu}}^{\text{2+}}\left(aq\right)+\text{Ag}\left(s\right)$

The charge of this equation is not balanced. Thus, put coefficient 2 in front of Ag and ${\text{Ag}}^{\text{+}}$ to balance the given chemical equation.

${\text{2Ag}}^{\text{+}}\left(aq\right)+\text{Cu}\left(s\right)\to {\text{Cu}}^{\text{2+}}\left(aq\right)+2\text{Ag}\left(s\right)$

Conclusion

A. Cu is balanced in both sides. Thus option A is incorrect.

C. An electron does not need to appear in the equation. Thus option C is incorrect.

D. Charge of the equation is not balanced. Thus option D is incorrect.