Which of these statements best describes the relationship between elements, compounds, and pure substances? pure substances can be divided into two groups: elements and compounds. compounds can be divided into two groups: pure substances and elements. elements and pure substances are two of many different types of compounds. pure substances and compounds are two of many different types of elements.

pure substances can be divided into two groups; elements and compounds

Pure substances can be divided into two groups: elements and compounds.

Explanation:

Pure substances can be recognized because they have a definite constant composition, as can be seen in the formula, and distinct chemical properties.

For example, H₂O is a pure substance where the relation of 2 atoms of Hydrogen to 1 atom of Oxygen is always true. O₂ is also a pure substance because 1 molecule of O₂ always contains two atoms of Oxygen.

As we can see from above, pure substances can be formed by one or more types of atoms. Substances formed by 2 or more types of atoms are known as compounds (e.g. H₂O, CO₂). Substances formed by 1 type of atoms are known as elements (e.g. Na, O₂, O₃).

Compounds and elements are kinds of pure substances, so they inherit all properties from them (definite constant composition, distinct chemical properties).

a. a primary source combines several different accounts of an event. b. a primary source generally benefits from having been written after an event.

explanation: