Question

a student is examining the liquid mercury inside a thermometer. if the liquid is composed of only mercury atoms, what can the student conclude? a the liquid is a pure substance because it is made up of elements. b the liquid is a pure substance because it is made up of mixtures. c the liquid is an impure substance because it is in a liquid state. d the liquid is an impure substance because it is inside a thermometer.

Explanation:

A pure substance is made up of only one - type of particle. Mercury is an element and if the liquid in the thermometer is composed only of mercury atoms, it is a pure substance because elements are pure substances. Being in a liquid state or being inside a thermometer does not determine purity. A mixture is made up of different substances.

Answer:

A. The liquid is a pure substance because it is made up of elements.