Which of the descriptions below does not explain the effects of air pollution on the respiratory system?
a.it could restrict air flow through the bronchi. b.it could disrupt the rate of ventilation. c.it could prevent hemoglobin from binding to oxygen. d.it could increase carbon dioxide uptake in alveolar sacs

Both the observations are a type of chemical change.

Explanation:

A physical change is defined as the change which occurs when there is no change in the composition of a substance. The physical state of the substance is changed. No new substance is formed.

A chemical change is defined as the change which occurs when there is change in the composition of a substance. New substance is formed at the end of the reaction.

There are many indicators which show us that a chemical change is happening in the reaction:

For the reaction of vinegar and baking soda, the equation follows:

For the observations given in the question:

Observation 1. In this observation, the temperature is being decreased because this reaction is an endothermic process. As there is change in temperature, hence it is considered as a chemical change.

Observation 2: In this observation, gas bubbles are formed due to the release of carbon dioxide gas. As there is formation of bubbles in this reaction. Hence, it is considered as a chemical change.