Answer the following questions in brief:

(a) Why is chemistry known as an experimental science?

(b) Why are most of the apparatus made of glass?

(a) Chemistry is the branch of science which is mostly based on experiments and observations. An experiment performed under controlled conditions is an activity where we observe a natural or an artificially created phenomenon. Hence, chemistry is known as an experimental science.

(b) Most of the apparatus is made of glass due to the following reasons:

1. Glass is a transparent material and we can see through it clearly.
2. Glass can withstand high temperatures.
3. Glass is easy to clean.
4. Glass does not react with most of the chemicals used in experiments.
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.