• 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.
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