directions: select the correct diagram. which of the following diagrams shows a pure substance that is…

directions: select the correct diagram. which of the following diagrams shows a pure substance that is composed of only individual atoms and not molecules? liquid water (h₂o) hydrogen gas (h₂) carbon dioxide gas (co₂) argon gas (ar)

directions: select the correct diagram. which of the following diagrams shows a pure substance that is composed of only individual atoms and not molecules? liquid water (h₂o) hydrogen gas (h₂) carbon dioxide gas (co₂) argon gas (ar)

Answer

Answer:

Argon gas (Ar) diagram

Explanation:

Step1: Understand pure - substance types

A pure substance can be an element or a compound. Elements can exist as individual atoms or molecules. Compounds are always molecules.

Step2: Analyze each substance

  • Liquid water ($H_2O$) is a compound, exists as $H_2O$ molecules.
  • Hydrogen gas ($H_2$) is an element but exists as $H_2$ molecules.
  • Carbon - dioxide gas ($CO_2$) is a compound, exists as $CO_2$ molecules.
  • Argon gas (Ar) is a noble gas element. Noble gases exist as individual atoms because they have a stable electron configuration and do not form molecules under normal conditions.