Chemistry is an experimental science that combines academic study with the acquisition of practical and investigational skills. It is often called the central science, as chemical principles underpin both the physical environment in which we live and all biological systems. Despite the exciting and extraordinary development of ideas throughout the history of chemistry, certain things have remained unchanged. Observations remain essential at the very core of chemistry, and this sometimes requires decisions about what to look for. The scientific processes carried out by the most eminent scientists in the past are the same ones followed by working chemists today and, crucially, are accessible to students in schools. The teacher, who is free to use any suitable experiments or stimulations, designs the IB Chemistry practical scheme of work. This practical work should complement the theory naturally, as they do in the wider scientific community. The chemistry course allows students to develop traditional practical skills and techniques and to increase facility in the use of mathematics, which is the language of science. It also allows students to develop interpersonal skills, and digital technology skills, which are essential in 21st century scientific endeavour and are important life-enhancing, transferable skills in their own right. Through selection of an option, the course allows teachers some flexibility to tailor the course to meet the needs of their students. Chemistry is a prerequisite for many other courses in higher education, such as medicine, biological science and veterinary science, and serves as useful preparation for employment.