Question

In a chemical reaction, which aspect of the reactants changes?

total mass

nuclei

arrangement of the atoms

name of each element

Answer 1

In a chemical reaction, the aspect of the reactants that changes is the **arrangement of the atoms**. During a chemical reaction, the atoms of the reactants rearrange to form new substances (products), while the total mass remains constant (according to the law of conservation of mass), the nuclei of the atoms typically remain unchanged, and the names of the elements involved do not change.