Why is respiration considered a chemical reaction?
Answer and explanation
Correct answer: Glucose reacts with oxygen to form carbon dioxide, water, and energy
During respiration, glucose is oxidised and new substances, carbon dioxide and water, are formed; energy is also released. It can be represented as \(\text{glucose} + \text{oxygen} \rightarrow \text{carbon dioxide} + \text{water} + \text{energy}\). Formation of new substances is the defining feature of a chemical reaction. In contrast, the entry of air in option B is only a physical process and is not itself the chemical reaction of respiration.
Frequently asked questions
What is the correct answer to this question?
Glucose reacts with oxygen to form carbon dioxide, water, and energy
Why is this the correct answer?
During respiration, glucose is oxidised and new substances, carbon dioxide and water, are formed; energy is also released. It can be represented as \(\text{glucose} + \text{oxygen} \rightarrow \text{carbon dioxide} + \text{water} + \text{energy}\). Formation of new substances is the defining feature of a chemical reaction. In contrast, the entry of air in option B is only a physical process and is not itself the chemical reaction of respiration.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
