Final answer:
The representation of energy transfer in the model is the arrow between the reactants and the products, indicating the direction and energy flow during the chemical reaction.
Step-by-step explanation:
The feature of the model that represents a transfer of energy is B. The arrow between the reactants and the products. In chemical reactions, the arrow signifies the process in which reactants are converted into products, demonstrating the direction of the reaction and the flow of energy.
For instance, in the reaction where sugar (C6H12O6) reacts with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O), the arrow pointing from the reactants to the products illustrates the release of energy that occurs when glucose is metabolized in the body.
The balanced chemical equation for this reaction is:
C6H12O6 + 6 O2 → 6 CO2 + 6 H2O
This exemplifies the conversion of glucose and oxygen into water and carbon dioxide, which is a process that releases energy in the form of ATP that the body utilizes.