human
What is evidence at the molecular/atomic level that a chemical reaction has occurred?
gpt
Evidence at the molecular/atomic level that a chemical reaction has occurred includes: 1. atoms combine with other atoms to form compounds, 2. new molecules form, 3. original molecules decompose, and 4. atoms in one molecule change places with atoms in another molecule.
Explanation: Chemical reactions involve changes to the arrangement and bonding of atoms, which can be observed at the molecular and atomic level through various evidence, such as the formation of new compounds, changes in molecular structure, and decomposition of original molecules.