Why aren't descriptive investigations repeatable?

The boiling point of propanoic acid is higher than that of 1-butanol because: propanoic acid has a higher molecular weight than 1-butanol. propanoic acid is more soluble in water than 1-butanol. propanoic acid is a better hydrogen bond donor than 1-butanol. propanoic acid forms hydrogen bonded dimers and 1-butanol does not. 1-butanol forms hydrogen bonded dimers and propanoic acid does not.

The formation of a solid, also known as a is an indication of a chemical change. precipitate particulate particle powder

The biosphere of the earth is made up of what compound? organic or inorganic?