Question

claiming conservation quick check
which statement accurately describes what happens in a reaction when reactants become products? (1 point)
some reactants rearrange to form products, and any leftover reactants are lost.
atomic bonds break and form, constantly changing between the reactant and product compounds.
reactant bonds break and atoms rearrange to form new product combinations.
reactant compounds bond together to form bigger product compounds.

Explanation:

• In a chemical reaction, reactant bonds break (this requires energy).
• Then, the atoms rearrange (due to their valence electron configurations and the drive to achieve more stable electron arrangements).
• And new bonds form to create products (releasing energy in the process).
• The law of conservation of mass states that atoms are not lost or created, just rearranged. So the first option is wrong as atoms aren't "lost".
• The second option is incorrect because it's not a constant back - and - forth in a simple reaction (it implies an equilibrium situation which isn't what the question is about in a general reaction description).
• The fourth option is wrong because it's not just about bonding together to form bigger compounds in all reactions (e.g., decomposition reactions break compounds apart).

Answer:

Reactant bonds break and atoms rearrange to form new product combinations.