Summary:
- Chemistry is the study of the composition of matter and the changes that matter undergoes.
- Chemists look at the world in two ways, often simultaneously.
- The two worlds of the chemist are the macroscopic world and the microscopic world.
- Chemistry explains why the leaves of deciduous trees turn from green in the summer to various shades of red and yellow in the autumn.
- Chemistry explains why certain pollutants called chlorofluorocarbons have done lasting damage to the ozone layer of our planet.