What is Chemistry A level? Chemistry is the study of why reactions happen. Chemistry is fundamental to life, explaining phenomena from how we can power the modern world, to why we can see colour to how DNA and proteins interact. Throughout your studies you will learn the chemistry of topics ranging from the synthesis of aspirin to the interactions that have shaped life on Earth. You should consider Chemistry A level if you enjoy both conducting and explaining practical investigations and want to delve deeper into the “why” behind every chemical reaction. Exam Board: OCR