Chapter 1 - Chemical Foundations

quantitative observation

A(n) ________ is also known as measurement involves a number and a unit.

pure substance

When a mixture contains several volatile components, the one- step distillation does not give a(n) ________ in the receiving flasks, and more elaborate methods are required.

possible explanation

A hypothesis is a(n) ________ for an observation.

mixture

When a(n) ________ is separated, the absolute purity of the separated components is an ideal.

Theories

________ are human inventions that represent attempts to explain observed natural behavior.