A student says that a chemical reaction hasn't occurred unless the total number of atoms has changed is she correct or incorrect and why

The student is wrong to say that  chemical reaction hasn't occurred unless the total number of atoms has changed.

According to the law of conservation of mass, matter can neither be created nor destroyed. The student is wrong by saying that a chemical reaction hasn't occurred unless the total number of atoms has changed.A chemical reaction is known to alter the arrangement of atoms but there is never a loss of atom.For instance, water molecules that are made up of 2 hydrogens and 1 oxygen molecule can change state and still retain their composition by mass.

When the molecules of these elements combine, a chemical reaction is known to occur.

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No. She is not correct.

Explanation:

A chemical reaction alters the distribution or arrangement of the atoms. However, there is no loss of atom because according to the Law of Conversion of Mass, Matter can neither be created nor destroyed.

For example, the makeup of water is two molecules of Hydrogen and One Molecule of Oxygen (that is O). It can change states and still retain its composition (that is, the same number of atoms) however if it comes in contact with Sodium metal (Na), the atoms become re-arranged and new substances are formed. The two substances that are formed are:

molecular Hydrogen (H2) and Sodium hydroxide (NaOH).

When this happens, we know that a chemical reaction has happened.

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