The scientist who theorized that chemical reactions occur when atoms are separated, joined, or rearranged

Answer 1

The scientist who theorized that chemical reactions occur when atoms are separated, joined, or rearranged is Antoine Lavoisier. He is often referred to as the "Father of Modern Chemistry" and made significant contributions to the understanding of chemical reactions and the concept of conservation of mass. Lavoisier conducted numerous experiments, including the combustion of substances, and he proposed the theory of chemical reactions based on the idea that elements are neither created nor destroyed during a chemical reaction, but rather rearranged. His work laid the foundation for modern chemistry and helped establish it as a distinct scientific discipline.