Question

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

Explanation:

• In a chemical reaction, atoms are not created or destroyed (Law of Conservation of Mass). Atoms are just rearranged. 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 are not just added or removed in a simple sense. They are broken down and new ones are formed. Molecules do not always remain intact as their bonds are broken. Atoms are not added or removed; they are just rearranged.

Answer:

Atoms always remain intact during chemical reactions.