Answer the following questions in brief: (a) Why is chemistry known as an experimental science? (b) Why are most apparatus made of glass ?


(a) Chemistry is known as experimental science as an experiment is performed under controlled conditions in an activity and we observe a natural or an artificially created phenomenon.
(b) Most of the laboratory apparatus is made of glass because :

  1. glass is easy to clean.
  2. Glass is transparent material and we can see through it clearly.
  3. It does not react with most of the chemicals used in experiments.
  4. Glass withstands high temperatures.
  5. Pyrex glass or borosil glass is a special type of glass which hardly expands on heating. Such glasses do not break even at high temperatures.