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Use the chemical reaction to answer the question.

NaHCO3+HC2H3O2→NaC2H3O2+H2O+CO2
A student mixes baking soda ( NaHCO3 ) and acetic acid ( HC2H3O2 ) to produce a chemical reaction shown. Which statement about the reaction is correct?

(1 point)
Responses

The atoms of the reactants are regrouped during the reaction.
The atoms of the reactants are regrouped during the reaction.

Atoms of Na are destroyed during the reaction.
Atoms of Na are destroyed during the reaction.

Some atoms gain mass after the reaction.
Some atoms gain mass after the reaction.

There are more H atoms after the reaction.
There are more H atoms after the reaction.

3 answers

The correct statement about the reaction is:

The atoms of the reactants are regrouped during the reaction.

In a chemical reaction, the atoms are rearranged to form new substances, but they are neither created nor destroyed. Therefore, the first statement accurately describes what happens during the reaction.

The other statements are incorrect because:

  • Atoms of Na are not destroyed; they are conserved.
  • The mass of atoms does not increase; mass is conserved.
  • The number of H atoms is the same before and after the reaction; they are also conserved.
Use the chemical reaction to answer the question.

2H2+O2→2H2O
There are four atoms of hydrogen ( H ) before the reaction. How many atoms of hydrogen are present after the reaction?

(1 point)
Responses

2
2

8
8

5
5

4
4

In the reaction \(2H_2 + O_2 → 2H_2O\), there are four hydrogen atoms on the left side (2 molecules of \(H_2\), each containing 2 hydrogen atoms).

On the right side, in \(2H_2O\), there are also four hydrogen atoms (2 molecules of \(H_2O\), each containing 2 hydrogen atoms).

Therefore, the number of hydrogen atoms present after the reaction is:

4

So the correct response is:

4