Question

When vinegar and baking soda react, the mixture becomes cold to the touch and a gas and a new liquid substance are formed.

Which best describes what is occurring in the reaction?

A: The reaction is chemical and endothermic.
B: The reaction is chemical and exothermic.
C: The reaction is non-chemical and endothermic.
D: The reaction is non-chemical and exothermic.

Answer 1

A : The reaction is chemical and endothermic.

Answer 2

Answer: A: The reaction is chemical and endothermic.

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

It is a chemical change as the rearrangement of atoms take place and formation of new products take place which includes a liquid and gas.

As the reaction vessel becomes cold to touch, it means the reaction is endothermic which means the energy is absorbed by the reactants to convert to products.

In physical change, the rearrangement of atoms do not take place and no new products are formed. exothermic reactions are the ones in which heat is released and the reaction vessel becomes hot.