Question

a chemical reaction is any process that causes atoms to be ______.

○ created

○ modified

Explanation:

In chemical reactions, according to the law of conservation of mass, atoms are neither created nor destroyed, but they can be rearranged or modified (in terms of their bonding and association with other atoms) to form new substances. The option "created" is incorrect because atoms are not created in a chemical reaction (nuclear reactions can create or destroy atoms, but that's a different domain). So "modified" is the correct choice as chemical reactions involve the rearrangement/modification of atoms to form new compounds.

Answer:

modified