Chapter 23, Problem 92A

Interpretation Introduction

Interpretation:

The balanced chemical equations for photosynthesis, cellular respiration, and the hydrolysis of lactose needs to be determined.

Concept introduction:

Plants make their food by the process of photosynthesis. Cellular respiration is a redox process.

Answer to Problem 92A

The balanced chemical equation for photosynthesis is,

$\begin{array}{l}{\text{6CO}}_{\text{2}}\text{+}{\text{6H}}_{\text{2}}\text{O}\text{+}\text{light}\text{energy}\to {\text{C}}_{\text{6}}{\text{H}}_{\text{12}}{\text{O}}_{\text{6}}\text{+}{\text{6O}}_{\text{2}}\\ \text{Carbon}\text{Water}\text{Glucose}\text{Oxygen}\\ \text{dioxide}\end{array}$

The balanced chemical equation for cellular respiration is,

$\begin{array}{l}{\text{C}}_{\text{6}}{\text{H}}_{\text{12}}{\text{O}}_{\text{6}}\text{+}{\text{6O}}_{\text{2}}\to {\text{6CO}}_{\text{2}}+{\text{6H}}_{\text{2}}\text{O}\text{+}\text{energy}\\ \text{Glucose}\text{Oxygen}\text{Carbon-dioxide}\text{Water}\end{array}$

The balanced chemical equation for the hydrolysis of lactose is,

Explanation of Solution

The balanced chemical equation for photosynthesis is,

$\begin{array}{l}{\text{6CO}}_{\text{2}}\text{+}{\text{6H}}_{\text{2}}\text{O}\text{+}\text{light}\text{energy}\to {\text{C}}_{\text{6}}{\text{H}}_{\text{12}}{\text{O}}_{\text{6}}\text{+}{\text{6O}}_{\text{2}}\\ \text{Carbon}\text{Water}\text{Glucose}\text{Oxygen}\\ \text{dioxide}\end{array}$

Carbon dioxide reacts with water in presence of light to give glucose and oxygen.

The balanced chemical equation for cellular respiration is,

$\begin{array}{l}{\text{C}}_{\text{6}}{\text{H}}_{\text{12}}{\text{O}}_{\text{6}}\text{+}{\text{6O}}_{\text{2}}\to {\text{6CO}}_{\text{2}}+{\text{6H}}_{\text{2}}\text{O}\text{+}\text{energy}\\ \text{Glucose}\text{Oxygen}\text{Carbon-dioxide}\text{Water}\end{array}$

Glucose reacts with oxygen to give carbon dioxide, water and energy.

The balanced chemical equation for the hydrolysis of lactose is,

Lactose undergoes hydrolysis to give D Galactose and D Glucose.

Conclusion

Carbon dioxide reacts with water in presence of light to give glucose and oxygen. Glucose reacts with oxygen to give carbon dioxide, water and energy and Lactose undergoes hydrolysis to give D Galactose and D Glucose..