Therefore, the question I had in mind is how predictive computational theoretical chemistry is. I asked this question on X/Twitter in August 2024. (This happened before many scientists, including myself, migrated to other healthier social networks, mostly Bluesky.) I've gotten tremendous feedback from colleagues, many proudly showing off how their theoretical research has been empirically corroborated. I collected the answers and curated them. This paper is the result of this exercise. It aims to survey several case studies where theoretical chemical predictions were later experimentally corroborated. It spans various subfields-from bioinorganic chemistry to antimatter physics-illustrating how insightful Dirac was when he mentioned the "whole of chemistry."