Question

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.

Answer 1

Baking soda reacts with the vinegar to produce carbon dioxide gas, sodium acetate, and water. ... Since more energy was needed to break the baking soda and vinegar apart, the temperature went down( endothermic reaction.

hope you can do your answers from this

Answer 2

Answer: 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:

1. Change in color
2. Formation of bubbles
3. Change in temperature
4. Formation of precipitate
5. Characteristic Odor

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

$CH_3COOH(aq.)+NaHCO_3(aq.)\rightarrow CH_3COONa(aq.)+H_2O(l)+CO_2(g)$

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.