Question 5 (essay worth 4 points)
(01.05 mc)
during an experiment vinegar was added to baking soda. the following observations were recorded.
observation 1: the container with the reaction mixture feels cooler.
observation 2: gas bubbles are released.
based on the observation, justify the type of change (physical or chemical) that took place.

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.