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Which observations demonstrate that cellular respiration is a chemical reaction?

Select all that apply.

Responses

Both the reactants and the products include sugar molecules.
Both the reactants and the products include sugar molecules.

The reactants include sugar molecules, but the products do not.
The reactants include sugar molecules, but the products do not.

Carbon dioxide gas is one of the products. However, it is not one of the reactants.
Carbon dioxide gas is one of the products. However, it is not one of the reactants.

Carbon dioxide gas is one of the reactants. However, it is not one of the products.

1 answer

To demonstrate that cellular respiration is a chemical reaction, one should consider that during a chemical reaction, substances change from reactants to products, and their compositions are altered. Here are the observations relevant to this:

  1. The reactants include sugar molecules, but the products do not. - This observation indicates that sugar is used up in the process, which is a characteristic of a chemical reaction.

  2. Carbon dioxide gas is one of the products. However, it is not one of the reactants. - This indicates a transformation where new substances (CO2) are formed that were not present in the reactants. This is also characteristic of a chemical reaction.

Therefore, the applicable observations demonstrating cellular respiration as a chemical reaction are:

  • The reactants include sugar molecules, but the products do not.
  • Carbon dioxide gas is one of the products. However, it is not one of the reactants.