Question

When hydrogen peroxide bubbles, it is undergoing a chemical change. Which statement best describes what is happening?

The atoms in hydrogen peroxide are breaking apart and forming new types of molecules.
The atoms in hydrogen peroxide are breaking apart and recombining into the original molecules.
The molecules of hydrogen peroxide remain intact as new types of molecules form and move out of the liquid.
The molecules of hydrogen peroxide remain intact but move more quickly to allow evaporation.

Answer 1

The atoms in hydrogen peroxide are breaking apart and forming new types of molecules.

Reason: H2O2 decomposes into water and oxygen (2 H2O2 → 2 H2O + O2), so bonds are broken and atoms rearrange to make new molecules (oxygen gas bubbles).