Chemistry is often called the science because it involves the study of the materials in the universe and the changes these materials undergo

Central

Explanation:

Chemistry is often called the central science because of connects the physical sciences, life sciences and applied sciences.

Chemistry is the study of matter and changes undergone by matter. This makes chemistry to occupy a central place in many scientific disciplines including medicine, engineering, pharmacy, geology etc. Basic knowledge of chemistry is usually required by experts in these disciplines.

1. they vary with a higher number because boiling is way hotter than melting

b) nuclear ive learned that in a pedtrodic table