Question

chemical reactions quick check
use the chemical reaction to answer the question.
mathrm{nahco}_{3}+mathrm{hc}_{2} mathrm{h}_{3} mathrm{o}_{2}
ightarrow mathrm{nac}_{2} mathrm{h}_{3} mathrm{o}_{2}+mathrm{h}_{2} mathrm{o}+mathrm{co}_{2}
a student mixes baking soda ( left(mathrm{nahco}_{3}
ight) ) and acetic acid ( left(mathrm{hc}_{2} mathrm{h}_{3} mathrm{o}_{2}
ight) ) to produce a chemical reaction shown. which statement about the reaction is correct?
(1 point)
some atoms gain mass after the reaction
there are more ( mathrm{h} ) atoms after the reaction
atoms of ( mathrm{na} ) are destroyed during the reaction
the atoms of the reactants are regrouped during the reaction

Explanation:

According to the law of conservation of mass, atoms are not created, destroyed, or gain mass in a chemical reaction. They are just regrouped.

• For the first option: Atoms do not gain mass in a chemical reaction.
• For the second option: The number of H atoms remains the same before and after the reaction (counting in the given reaction: on the reactant side from \(NaHCO_3\) and \(HC_2H_3O_2\) and on the product side from \(NaC_2H_3O_2\), \(H_2O\) and \(CO_2\)).
• For the third option: Atoms of Na are not destroyed.
• For the fourth option: In a chemical reaction, the atoms of the reactants (\(NaHCO_3\) and \(HC_2H_3O_2\)) are rearranged (regrouped) to form products (\(NaC_2H_3O_2\), \(H_2O\) and \(CO_2\)).

Answer:

The atoms of the reactants are regrouped during the reaction.