Question

which statement is true? (1 point)
atoms always remain intact during chemical reactions.
molecules always remain intact during chemical reactions.
atoms are added and removed during chemical reactions.
molecules are added and removed during chemical reactions.

Explanation:

• In a chemical reaction, atoms are the basic units that are rearranged. They are not created or destroyed (Law of Conservation of Mass). Molecules break apart (their bonds are broken) and new molecules are formed (new bonds are made). So, atoms always remain intact during chemical reactions.
• Molecules do not always remain intact as their bonds can be broken. Atoms are not added or removed in a chemical reaction (again, Law of Conservation of Mass). Molecules are not just added and removed; they are transformed through bond - breaking and bond - forming processes.

Answer:

Atoms always remain intact during chemical reactions.